Computer Networks. Network Security and Ethics. Week 14. College of Information Science and Engineering Ritsumeikan University
|
|
- Felix Marshall
- 6 years ago
- Views:
Transcription
1 Computer Networks Network Security and Ethics Week 14 College of Information Science and Engineering Ritsumeikan University
2 Security Intro for Admins l Network administrators can break security into two parts: internal and external security l Internal security is acting to prevent and handle internal threats, that is threats from authorized users l External security is acting to prevent and handle threats from non-users
3 Internal Security Threats l Users may access data or services not intended for them and may take it out of protected areas or give it to unauthorized people, other users data or system or corporate data l Users may use services or systems for criminal or unauthorized activity l Users may impersonate other users l Users may compromise security by accident, such as by worm or virus
4 Internal Security Tasks l Managing user accounts l Managing access permissions by groups or by account type user, system (for access to specific functions), or root account (superuser) l Password policy management l File and directory permissions l Educating and handling user support for security understanding and compliance
5 External Security Threats l Front-door threats may occur when a non-user gains access to a password or cracks an access system (for example by brute force or by guessing) l Back-door threats occur from unpatched bugs in software and from intentional back doors in malicious software l Denial-of-service (DoS) attacks are typically used to eat up CPU time and network processes, thus making services unavailable
6 External Security Tasks l Examining access logs for suspicious access attempts or successes l Scanning incoming data from network or from other IO devices for known malicious software l Manage access from external sources and limit them to those that absolutely require outside access l Limit internal access to servers providing external services
7 Information Security Issues l Confidentiality sending data without letting others know any contents l Authentication establishing identity l Integrity and non-repudiation to be able to show that a message had a certain sender l Availability and Access keeping services available and accessible to the appropriate users 7
8 Confidentiality l Based on encryption and decryption l Secret algorithms or secret methods of transmission are not reliably secure l Instead, modern encryption depends on open (public) algorithms and secret (private) keys l Number theory offers a way to use both public keys and private keys together to allow open but confidential communication l Encryption and one-way functions are also the basis for other security issues, such as authentication, integrity, and non-repudiation 8
9 Basic Tools of Security l Modern security uses known algorithms l Extremely large pseudorandom numbers and prime numbers make finding passwords and keys by chance or by brute force very unlikely l Cryptographic hashing protects passwords and authenticates documents l Symmetric cryptography, such as block cryptography, is fast and strong l Asymmetric cryptography is slower but allows key exchange, public document signing, and authentication protocols 9
10 Symmetric Key Cryptography l Key is called symmetric-, secret-, private-, shared-, or single-key cryptography l The same key is used to encrypt and decrypt l A key in cryptography is generally a very large integer or set of integers and is used in a known (public) algorithm to encrypt and/or decrypt a message E BE 1E A2 5B 3A 66 D3 2C 39 6D 3A DB 6F A pseudo-randomly generated 128-bit key 10
11 Symmetric Key Cryptography Plaintext private key A Encrypted data private key A Plaintext Encryption algorithm Decryption algorithm l Sharing a key means more trust is needed and a system of key distribution is needed l Exchanging information with unknown agents would require a new key each time 11
12 Public-key Cryptography l In this method, a different key is used to encrypt and decrypt l The key for encryption can, therefore, be shared publically, even with untrusted agents l The numbers used are extremely large l The algorithms used are very well-known mathematically and thought to be secure, although this hasn t been shown conclusively l Brute force breaking even of 128 bit keys, for certain algorithms, is thought to be many decades away, if ever 12
13 Public Key Cryptography Plaintext public key A Encrypted data private key B Plaintext Encryption algorithm Decryption algorithm l The receiving agent shares the key with anyone who wants to transmit l The transmitting agent uses the public algorithm and public key to encrypt l Except by brute force, there is no known algorithm for using the public key to decrypt 13
14 Why Public Keys Work public key A (n, e) private (n, d) key B l The basic math is from over 200 years ago l Two prime numbers p and q are multiplied together to form p * q = n l Two other integers, d and e, are found such that d * e = 1, mod (p - 1) * ( q - 1) l Now we have M e d = M and M d e = M (all mod n) l The public key (n, e) is used to encrypt a plaintext char M to C by C = M e (mod n) l The private key (n, d) is used to decrypt C to plaintext char M by M = C d (mod n) 14
15 Is a Public Key Secure? l The algorithm relies on the fact that, other than brute force, there is no known way to find the two primes p and q from p * q l The number of possible prime numbers for most keys would take the fastest computers, even working in parallel, billions of years to find the factors l However, no one has proven mathematically that there is no possible way to factor p * q l If the implementation or handling of keys is poor, no system is secure 15
16 Known Plaintext Attack l One way the public-key system can be attacked is by taking some plaintext that might occur in the text and running it through the public key algorithm l This method will not find the private key but can find bits of plaintext that have been encrypted l For this and other reasons, encryption is usually combined with other security methods, plus compression to make such attacks more difficult 16
17 Public Keys for Other Purposes l Public key algorithms can be used for authentication and non-repudiation as well l These systems require more complex protocols involving trusted agents and careful exchange of signatures which include encrypted checksum results l All of these depend on one-way functions, which, like factoring, are easy to compute one-way but considered difficult (or even impossible) to reverse 17
18 Ethical Issues Tensions between government and governed: l Privacy the right to keep personal information and activities secret or closed l Openness the right to knowledge and unrestricted access to information l Intellectual Property the right to exercise control over original concepts and content l Neutrality and control networks should treat all communication the same, regardless of content l Literacy enabling access through education in computer science and networking Those who sacrifice liberty for security deserve neither [and will lose both] Benjamin Franklin 18
Cryptographic Concepts
Outline Identify the different types of cryptography Learn about current cryptographic methods Chapter #23: Cryptography Understand how cryptography is applied for security Given a scenario, utilize general
More information19.1. Security must consider external environment of the system, and protect it from:
Module 19: Security The Security Problem Authentication Program Threats System Threats Securing Systems Intrusion Detection Encryption Windows NT 19.1 The Security Problem Security must consider external
More informationComputers and Security
The contents of this Supporting Material document have been prepared from the Eight units of study texts for the course M150: Date, Computing and Information, produced by The Open University, UK. Copyright
More informationNetwork Security Issues and Cryptography
Network Security Issues and Cryptography PriyaTrivedi 1, Sanya Harneja 2 1 Information Technology, Maharishi Dayanand University Farrukhnagar, Gurgaon, Haryana, India 2 Information Technology, Maharishi
More informationEncryption Algorithms Authentication Protocols Message Integrity Protocols Key Distribution Firewalls
Security Outline Encryption Algorithms Authentication Protocols Message Integrity Protocols Key Distribution Firewalls Overview Cryptography functions Secret key (e.g., DES) Public key (e.g., RSA) Message
More informationCSC 474/574 Information Systems Security
CSC 474/574 Information Systems Security Topic 2.1 Introduction to Cryptography CSC 474/574 By Dr. Peng Ning 1 Cryptography Cryptography Original meaning: The art of secret writing Becoming a science that
More informationLecture 19: cryptographic algorithms
Lecture 19: cryptographic algorithms Operating Systems and Networks Behzad Bordbar School of Computer Science, University of Birmingham, UK 179 Overview Cryptographic algorithms symmetric: TEA asymmetric:
More informationIntroduction. CSE 5351: Introduction to cryptography Reading assignment: Chapter 1 of Katz & Lindell
Introduction CSE 5351: Introduction to cryptography Reading assignment: Chapter 1 of Katz & Lindell 1 Cryptography Merriam-Webster Online Dictionary: 1. secret writing 2. the enciphering and deciphering
More informationLecture 15: Cryptographic algorithms
06-06798 Distributed Systems Lecture 15: Cryptographic algorithms 22 March, 2002 1 Overview Cryptographic algorithms symmetric: TEA asymmetric: RSA Digital signatures digital signatures with public key
More information1.264 Lecture 28. Cryptography: Asymmetric keys
1.264 Lecture 28 Cryptography: Asymmetric keys Next class: Anderson chapters 20. Exercise due before class (Reading doesn t cover same topics as lecture) 1 Asymmetric or public key encryption Receiver
More informationSecurity+ Guide to Network Security Fundamentals, Third Edition. Chapter 11 Basic Cryptography
Security+ Guide to Network Security Fundamentals, Third Edition Chapter 11 Basic Cryptography Objectives Define cryptography Describe hashing List the basic symmetric cryptographic algorithms 2 Objectives
More informationAssignment 9 / Cryptography
Assignment 9 / Cryptography Michael Hauser March 2002 Tutor: Mr. Schmidt Course: M.Sc Distributed Systems Engineering Lecturer: Mr. Owens CONTENTS Contents 1 Introduction 3 2 Simple Ciphers 3 2.1 Vignère
More informationIntroduction to Cryptography
Introduction to Cryptography 1 2 Definition process data into unintelligible form, reversibly, without data loss typically digitally usually one-to-one in size $ compression analog cryptography: voice
More information2.1 Basic Cryptography Concepts
ENEE739B Fall 2005 Part 2 Secure Media Communications 2.1 Basic Cryptography Concepts Min Wu Electrical and Computer Engineering University of Maryland, College Park Outline: Basic Security/Crypto Concepts
More informationCRYPTOLOGY KEY MANAGEMENT CRYPTOGRAPHY CRYPTANALYSIS. Cryptanalytic. Brute-Force. Ciphertext-only Known-plaintext Chosen-plaintext Chosen-ciphertext
CRYPTOLOGY CRYPTOGRAPHY KEY MANAGEMENT CRYPTANALYSIS Cryptanalytic Brute-Force Ciphertext-only Known-plaintext Chosen-plaintext Chosen-ciphertext 58 Types of Cryptographic Private key (Symmetric) Public
More informationSecurity. Communication security. System Security
Security Communication security security of data channel typical assumption: adversary has access to the physical link over which data is transmitted cryptographic separation is necessary System Security
More informationProtecting Information Assets - Week 11 - Cryptography, Public Key Encryption and Digital Signatures. MIS 5206 Protecting Information Assets
Protecting Information Assets - Week 11 - Cryptography, Public Key Encryption and Digital Signatures MIS5206 Week 11 Identity and Access Control Week 10 continued Cryptography, Public Key Encryption and
More informationComputer Security: Principles and Practice
Computer Security: Principles and Practice Chapter 2 Cryptographic Tools First Edition by William Stallings and Lawrie Brown Lecture slides by Lawrie Brown Cryptographic Tools cryptographic algorithms
More informationEncryption and Forensics/Data Hiding
Encryption and Forensics/Data Hiding 1 Cryptography Background See: http://www.cacr.math.uwaterloo.ca/hac/ For more information 2 Security Objectives Confidentiality (Secrecy): Prevent/Detect/Deter improper
More informationNetwork Security and Cryptography. 2 September Marking Scheme
Network Security and Cryptography 2 September 2015 Marking Scheme This marking scheme has been prepared as a guide only to markers. This is not a set of model answers, or the exclusive answers to the questions,
More informationVerteilte Systeme (Distributed Systems)
Verteilte Systeme (Distributed Systems) Lorenz Froihofer l.froihofer@infosys.tuwien.ac.at http://www.infosys.tuwien.ac.at/teaching/courses/ VerteilteSysteme/ Security Threats, mechanisms, design issues
More informationKey Exchange. References: Applied Cryptography, Bruce Schneier Cryptography and Network Securiy, Willian Stallings
Key Exchange References: Applied Cryptography, Bruce Schneier Cryptography and Network Securiy, Willian Stallings Outlines Primitives Root Discrete Logarithm Diffie-Hellman ElGamal Shamir s Three Pass
More informationModule 20: Security. The Security Problem Authentication Program Threats System Threats Threat Monitoring Encryption. Operating System Concepts 20.
Module 20: Security The Security Problem Authentication Program Threats System Threats Threat Monitoring Encryption 20.1 The Security Problem Security must consider external environment of the system,
More informationDistributed Systems. 26. Cryptographic Systems: An Introduction. Paul Krzyzanowski. Rutgers University. Fall 2015
Distributed Systems 26. Cryptographic Systems: An Introduction Paul Krzyzanowski Rutgers University Fall 2015 1 Cryptography Security Cryptography may be a component of a secure system Adding cryptography
More informationCSC/ECE 774 Advanced Network Security
Computer Science CSC/ECE 774 Advanced Network Security Topic 2. Network Security Primitives CSC/ECE 774 Dr. Peng Ning 1 Outline Absolute basics Encryption/Decryption; Digital signatures; D-H key exchange;
More informationCSE 3461/5461: Introduction to Computer Networking and Internet Technologies. Network Security. Presentation L
CS 3461/5461: Introduction to Computer Networking and Internet Technologies Network Security Study: 21.1 21.5 Kannan Srinivasan 11-27-2012 Security Attacks, Services and Mechanisms Security Attack: Any
More informationDistributed Systems. Lecture 14: Security. Distributed Systems 1
06-06798 Distributed Systems Lecture 14: Security Distributed Systems 1 What is security? policies and mechanisms threats and attacks Overview Security of electronic transactions secure channels authentication
More informationDistributed Systems. Lecture 14: Security. 5 March,
06-06798 Distributed Systems Lecture 14: Security 5 March, 2002 1 What is security? policies and mechanisms threats and attacks Overview Security of electronic transactions secure channels authentication
More informationCOMP4109 : Applied Cryptography
COMP4109 : Applied Cryptography Fall 2013 M. Jason Hinek Carleton University Applied Cryptography Day 2 information security cryptographic primitives unkeyed primitives NSA... one-way functions hash functions
More information9/30/2016. Cryptography Basics. Outline. Encryption/Decryption. Cryptanalysis. Caesar Cipher. Mono-Alphabetic Ciphers
Cryptography Basics IT443 Network Security Administration Slides courtesy of Bo Sheng Basic concepts in cryptography systems Secret cryptography Public cryptography 1 2 Encryption/Decryption Cryptanalysis
More informationMost Common Security Threats (cont.)
Most Common Security Threats (cont.) Denial of service (DoS) attack Distributed denial of service (DDoS) attack Insider attacks. Any examples? Poorly designed software What is a zero-day vulnerability?
More informationMessage authentication. Why message authentication. Authentication primitives. and secure hashing. To prevent against:
Message authentication and secure hashing Why message authentication To prevent against: Masquerade/impersonation Modification of message content Modification of message sequence Acceptance of replayed/delayed
More informationCryptography III. Public-Key Cryptography Digital Signatures. 2/1/18 Cryptography III
Cryptography III Public-Key Cryptography Digital Signatures 2/1/18 Cryptography III 1 Public Key Cryptography 2/1/18 Cryptography III 2 Key pair Public key: shared with everyone Secret key: kept secret,
More informationCryptography Basics. IT443 Network Security Administration Slides courtesy of Bo Sheng
Cryptography Basics IT443 Network Security Administration Slides courtesy of Bo Sheng 1 Outline Basic concepts in cryptography systems Secret key cryptography Public key cryptography Hash functions 2 Encryption/Decryption
More informationClassical Cryptography. Thierry Sans
Classical Cryptography Thierry Sans Example and definitions of a cryptosystem Caesar Cipher - the oldest cryptosystem A shift cipher attributed to Julius Caesar (100-44 BC) MEET ME AFTER THE TOGA PARTY
More informationGarantía y Seguridad en Sistemas y Redes
Garantía y Seguridad en Sistemas y Redes Tema 2. Cryptographic Tools Esteban Stafford Departamento de Ingeniería Informá2ca y Electrónica Este tema se publica bajo Licencia: Crea2ve Commons BY- NC- SA
More informationOther Uses of Cryptography. Cryptography Goals. Basic Problem and Terminology. Other Uses of Cryptography. What Can Go Wrong? Why Do We Need a Key?
ryptography Goals Protect private communication in the public world and are shouting messages over a crowded room no one can understand what they are saying 1 Other Uses of ryptography Authentication should
More informationChapter 9 Public Key Cryptography. WANG YANG
Chapter 9 Public Key Cryptography WANG YANG wyang@njnet.edu.cn Content Introduction RSA Diffie-Hellman Key Exchange Introduction Public Key Cryptography plaintext encryption ciphertext decryption plaintext
More informationSecurity: Cryptography
Security: Cryptography Computer Science and Engineering College of Engineering The Ohio State University Lecture 38 Some High-Level Goals Confidentiality Non-authorized users have limited access Integrity
More informationCryptography (DES+RSA) by Amit Konar Dept. of Math and CS, UMSL
Cryptography (DES+RSA) by Amit Konar Dept. of Math and CS, UMSL Transpositional Ciphers-A Review Decryption 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Encryption 1 2 3 4 5 6 7 8 A G O O D F R I E N D I S A T R E
More informationSE420 Software Quality Assurance
SE420 Software Quality Assurance Encryption Backgrounder September 5, 2014 Sam Siewert Encryption - Substitution Re-map Alphabet, 1-to-1 and On-to (function) A B C D E F G H I J K L M N O P Q R S T U V
More informationNumber Theory and RSA Public-Key Encryption
Number Theory and RSA Public-Key Encryption Dr. Natarajan Meghanathan Associate Professor of Computer Science Jackson State University E-mail: natarajan.meghanathan@jsums.edu CIA Triad: Three Fundamental
More informationProtection and Security. Sarah Diesburg Operating Systems CS 3430
Protection and Security Sarah Diesburg Operating Systems CS 3430 Definitions Security: policy of authorizing accesses Prevents intentional misuses of a system Protection: the actual mechanisms implemented
More informationCS Computer Networks 1: Authentication
CS 3251- Computer Networks 1: Authentication Professor Patrick Traynor 4/14/11 Lecture 25 Announcements Homework 3 is due next class. Submit via T-Square or in person. Project 3 has been graded. Scores
More informationASYMMETRIC CRYPTOGRAPHY
ASYMMETRIC CRYPTOGRAPHY CONTENT: 1. Number Theory 2. One Way Function 3. Hash Function 4. Digital Signature 5. RSA (Rivest-Shamir Adleman) References: 1. Applied Cryptography, Bruce Schneier 2. Cryptography
More informationKALASALINGAM UNIVERSITY
KALASALINGAM UNIVERSITY (Kalasalingam Academy of Research and Education) DEPARTMENT OF COMPUTER SCIENCE AND ENGINEERING CLASS NOTES CRYPTOGRAPHY AND NETWOTK SECURITY (CSE 405) Prepared by M.RAJA AP/CSE
More informationDr. Jinyuan (Stella) Sun Dept. of Electrical Engineering and Computer Science University of Tennessee Fall 2010
CS 494/594 Computer and Network Security Dr. Jinyuan (Stella) Sun Dept. of Electrical Engineering and Computer Science University of Tennessee Fall 2010 1 Public Key Cryptography Modular Arithmetic RSA
More informationSankalchand Patel College of Engineering, Visnagar Department of Computer Engineering & Information Technology. Question Bank
Sankalchand Patel College of Engineering, Visnagar Department of Computer Engineering & Information Technology Question Bank Subject: Information Security (160702) Class: BE Sem. VI (CE/IT) Unit-1: Conventional
More informationSSH PK Authentication and Auto login configuration for Chassis Management Controller
SSH PK Authentication and Auto login configuration for Chassis Management Controller Dell technical white paper Dell Engineering May 2016 Author: Elangovan G Revisions Date August 2013 May 2016 Description
More informationICT 6541 Applied Cryptography Lecture 8 Entity Authentication/Identification
ICT 6541 Applied Cryptography Lecture 8 Entity Authentication/Identification Hossen Asiful Mustafa Introduction Entity Authentication is a technique designed to let one party prove the identity of another
More information1-7 Attacks on Cryptosystems
1-7 Attacks on Cryptosystems In the present era, not only business but almost all the aspects of human life are driven by information. Hence, it has become imperative to protect useful information from
More informationLecture IV : Cryptography, Fundamentals
Lecture IV : Cryptography, Fundamentals Internet Security: Principles & Practices John K. Zao, PhD (Harvard) SMIEEE Computer Science Department, National Chiao Tung University Spring 2012 Basic Principles
More informationPublic-key Cryptography: Theory and Practice
Public-key Cryptography Theory and Practice Department of Computer Science and Engineering Indian Institute of Technology Kharagpur Chapter 1: Overview What is Cryptography? Cryptography is the study of
More informationBS801E-BSCS. Cryptography
Jay-Ar Baliguat BS801E-BSCS Ms.Myrlen Maria Antoni Cryptography Cryptography can be defined as the conversion of data into a scrambled code that can be deciphered and sent across a public or private network.
More informationCSCI 454/554 Computer and Network Security. Topic 5.2 Public Key Cryptography
CSCI 454/554 Computer and Network Security Topic 5.2 Public Key Cryptography Outline 1. Introduction 2. RSA 3. Diffie-Hellman Key Exchange 4. Digital Signature Standard 2 Introduction Public Key Cryptography
More informationNetwork Security and Cryptography. December Sample Exam Marking Scheme
Network Security and Cryptography December 2015 Sample Exam Marking Scheme This marking scheme has been prepared as a guide only to markers. This is not a set of model answers, or the exclusive answers
More informatione-commerce Study Guide Test 2. Security Chapter 10
e-commerce Study Guide Test 2. Security Chapter 10 True/False Indicate whether the sentence or statement is true or false. 1. Necessity refers to preventing data delays or denials (removal) within the
More informationThe Network Security Model. What can an adversary do? Who might Bob and Alice be? Computer Networks 12/2/2009. CSC 257/457 - Fall
The Network Security Model Bob and lice want to communicate securely. Trudy (the adversary) has access to the channel. Kai Shen lice data channel secure sender data, control s secure receiver Bob data
More informationOutline. CSCI 454/554 Computer and Network Security. Introduction. Topic 5.2 Public Key Cryptography. 1. Introduction 2. RSA
CSCI 454/554 Computer and Network Security Topic 5.2 Public Key Cryptography 1. Introduction 2. RSA Outline 3. Diffie-Hellman Key Exchange 4. Digital Signature Standard 2 Introduction Public Key Cryptography
More informationCUNY John Jay College of Criminal Justice MATH AND COMPUTER SCIENCE
Instructor: Prof Aftab Ahmad Office: NB 612 Telephone No. (212)393-6314 Email Address: aahmad@jjay.cuny.edu Office Hours: By appointment TEXT & REFERENCE MATERIAL Text Notes from instructor posted on Blackboard
More informationSecurity in Distributed Systems. Network Security
Security in Distributed Systems Introduction Cryptography Authentication Key exchange Readings: Tannenbaum, chapter 8 Ross/Kurose, Ch 7 (available online) Computer Science Lecture 22, page 1 Network Security
More informationChapter 15: Security. Operating System Concepts 8 th Edition,
Chapter 15: Security, Silberschatz, Galvin and Gagne 2009 Chapter 15: Security The Security Problem Program Threats System and Network Threats Cryptography as a Security Tool User Authentication Implementing
More informationEncryption Details COMP620
Encryption Details COMP620 Encryption is a powerful defensive weapon for free people. It offers a technical guarantee of privacy, regardless of who is running the government It s hard to think of a more
More information18-642: Cryptography 11/15/ Philip Koopman
18-642: Cryptography 11/15/2017 Cryptography Overview Anti-Patterns for Cryptography Using a home-made cryptographic algorithm Using private key when public key is required Not considering key distribution
More informationCrypto-systems all around us ATM machines Remote logins using SSH Web browsers (https invokes Secure Socket Layer (SSL))
Introduction (Mihir Bellare Text/Notes: http://cseweb.ucsd.edu/users/mihir/cse207/) Cryptography provides: Data Privacy Data Integrity and Authenticity Crypto-systems all around us ATM machines Remote
More informationCristina Nita-Rotaru. CS355: Cryptography. Lecture 17: X509. PGP. Authentication protocols. Key establishment.
CS355: Cryptography Lecture 17: X509. PGP. Authentication protocols. Key establishment. Public Keys and Trust Public Key:P A Secret key: S A Public Key:P B Secret key: S B How are public keys stored How
More informationCSCE 715: Network Systems Security
CSCE 715: Network Systems Security Chin-Tser Huang huangct@cse.sc.edu University of South Carolina Next Topic in Cryptographic Tools Symmetric key encryption Asymmetric key encryption Hash functions and
More informationAmorphic Encryption. Egger Mielberg
Amorphic Encryption Egger Mielberg egger.mielberg@gmail.com 27.01.2019 Abstract. As a symmetric as an asymmetric scheme requires a key (session or private) to be hidden. In this case, an attacker gets
More informationOutline. Public Key Cryptography. Applications of Public Key Crypto. Applications (Cont d)
Outline AIT 682: Network and Systems Security 1. Introduction 2. RSA 3. Diffie-Hellman Key Exchange 4. Digital Signature Standard Topic 5.2 Public Key Cryptography Instructor: Dr. Kun Sun 2 Public Key
More information(2½ hours) Total Marks: 75
(2½ hours) Total Marks: 75 N. B.: (1) All questions are compulsory. (2) Makesuitable assumptions wherever necessary and state the assumptions made. (3) Answers to the same question must be written together.
More informationA New Symmetric Key Algorithm for Modern Cryptography Rupesh Kumar 1 Sanjay Patel 2 Purushottam Patel 3 Rakesh Patel 4
IJSRD - International Journal for Scientific Research & Development Vol. 2, Issue 08, 2014 ISSN (online): 2321-0613 A New Symmetric Key Algorithm for Modern Cryptography Rupesh Kumar 1 Sanjay Patel 2 Purushottam
More informationA Proposed Method for Cryptography using Random Key and Rotation of Text
Volume 6, No.2, March - April 2017 Mousumi Ghanti et al., International Journal of Advanced Trends in Computer Science and Engineering, 6(2), March - April 2017, 18-22 Available Online at http://www.warse.org/ijatcse/static/pdf/file/ijatcse03622017.pdf
More informationLecture 1 Applied Cryptography (Part 1)
Lecture 1 Applied Cryptography (Part 1) Patrick P. C. Lee Tsinghua Summer Course 2010 1-1 Roadmap Introduction to Security Introduction to Cryptography Symmetric key cryptography Hash and message authentication
More informationPYTHIA SERVICE BY VIRGIL SECURITY WHITE PAPER
PYTHIA SERVICE WHITEPAPER BY VIRGIL SECURITY WHITE PAPER May 21, 2018 CONTENTS Introduction 2 How does Pythia solve these problems? 3 Are there any other solutions? 4 What is Pythia? 4 How does it work?
More informationCRYPTOGRAPHY AND NETWORK SECURITY. K. Lakshmi Priya 1, P.Rubha 2,M.Niranjana 3 INTRODUCTION: ABSTRACT:
CRYPTOGRAPHY AND NETWORK SECURITY K. Lakshmi Priya 1, P.Rubha 2,M.Niranjana 3 1 Email:lakshmikpriya3698@gmail.com, 2 Email:rubhapandian@gmail.com, 3 Email:niranjanamurugan@gmail.com, Nadar Saraswathi College
More informationAnalysis of Cryptography and Pseudorandom Numbers
ISSN: 2454-2377 Volume 2, Issue 2, June 2016 Analysis of Cryptography and Pseudorandom Numbers Richa Agarwal Student, M. Tech., Computer Science, Invertis University, Bareilly, India Abstract: With the
More informationNETWORK SECURITY & CRYPTOGRAPHY
Assignment for IT Applications in Management Project On NETWORK SECURITY & CRYPTOGRAPHY Course Instructor Submitted By: Mr. ANIL KUMAR ROHIT BARVE 2013240 Section E PGDM 2013-15 Table of Contents Chapter
More informationISACA CISA. ISACA CISA ( Certified Information Systems Auditor ) Download Full Version :
ISACA CISA ISACA CISA ( Certified Information Systems Auditor ) Download Full Version : http://killexams.com/pass4sure/exam-detail/cisa QUESTION: 390 Applying a digital signature to data traveling in a
More informationkey distribution requirements for public key algorithms asymmetric (or public) key algorithms
topics: cis3.2 electronic commerce 24 april 2006 lecture # 22 internet security (part 2) finish from last time: symmetric (single key) and asymmetric (public key) methods different cryptographic systems
More informationWeb Tap Payment Authentication and Encryption With Zero Customer Effort
Web Tap Payment Authentication and Encryption With Zero Customer Effort Henry Ng Tap-Card-Pay Systems Corporation, Vancouver BC V5X3Y3, Canada henryng@tapcardpay.com Abstract. We propose a public-key authentication
More informationWhat did we talk about last time? Public key cryptography A little number theory
Week 4 - Friday What did we talk about last time? Public key cryptography A little number theory If p is prime and a is a positive integer not divisible by p, then: a p 1 1 (mod p) Assume a is positive
More informationPublic Key Cryptography
graphy CSS322: Security and Cryptography Sirindhorn International Institute of Technology Thammasat University Prepared by Steven Gordon on 29 December 2011 CSS322Y11S2L07, Steve/Courses/2011/S2/CSS322/Lectures/rsa.tex,
More informationThe question paper contains 40 multiple choice questions with four choices and students will have to pick the correct one (each carrying ½ marks.).
Time: 3hrs BCA III Network security and Cryptography Examination-2016 Model Paper 2 M.M:50 The question paper contains 40 multiple choice questions with four choices and students will have to pick the
More informationChapter 15: Security. Chapter 15: Security
Chapter 15: Security Chapter 15: Security The Security Problem Program Threats System and Network Threats Cryptography as a Security Tool User Authentication Firewalling to Protect Systems and Networks
More informationDavid Wetherall, with some slides from Radia Perlman s security lectures.
David Wetherall, with some slides from Radia Perlman s security lectures. djw@cs.washington.edu Networks are shared: Want to secure communication between legitimate participants from others with (passive
More informationHOST Authentication Overview ECE 525
Authentication Overview Authentication refers to the process of verifying the identity of the communicating principals to one another Usually sub-divided into Entity authentication Authentication in real-time
More informationComputer Security. 08r. Pre-exam 2 Last-minute Review Cryptography. Paul Krzyzanowski. Rutgers University. Spring 2018
Computer Security 08r. Pre-exam 2 Last-minute Review Cryptography Paul Krzyzanowski Rutgers University Spring 2018 March 26, 2018 CS 419 2018 Paul Krzyzanowski 1 Cryptographic Systems March 26, 2018 CS
More informationCS408 Cryptography & Internet Security
CS408 Cryptography & Internet Security Lectures 16, 17: Security of RSA El Gamal Cryptosystem Announcement Final exam will be on May 11, 2015 between 11:30am 2:00pm in FMH 319 http://www.njit.edu/registrar/exams/finalexams.php
More informationCS408 Cryptography & Internet Security
CS408 Cryptography & Internet Security Lecture 18: Cryptographic hash functions, Message authentication codes Functions Definition Given two sets, X and Y, a function f : X Y (from set X to set Y), is
More informationCryptography (Overview)
Cryptography (Overview) Some history Caesar cipher, rot13 substitution ciphers, etc. Enigma (Turing) Modern secret key cryptography DES, AES Public key cryptography RSA, digital signatures Cryptography
More informationAuthentication. Overview of Authentication systems. IT352 Network Security Najwa AlGhamdi
Authentication Overview of Authentication systems 1 Approaches for Message Authentication Authentication is process of reliably verifying the identity of someone. Authentication Schemes 1. Password-based
More informationPublic Key Algorithms
CSE597B: Special Topics in Network and Systems Security Public Key Cryptography Instructor: Sencun Zhu The Pennsylvania State University Public Key Algorithms Public key algorithms RSA: encryption and
More informationCRYPTOGRAPHY. BY, Ayesha Farhin
CRYPTOGRAPHY BY, Ayesha Farhin Overview Introduction Types Advantages n Disadvantages Future Developments Bibliography Introduction Cryptography considered as a branch of both mathematics and computer
More informationSecurity Digital Certificate Manager
System i Security Digital Certificate Manager Version 6 Release 1 System i Security Digital Certificate Manager Version 6 Release 1 Note Before using this information and the product it supports, be sure
More informationStudy on data encryption technology in network information security. Jianliang Meng, Tao Wu a
nd International Workshop on Materials Engineering and Computer Sciences (IWMECS 05) Study on data encryption technology in network information security Jianliang Meng, Tao Wu a School of North China Electric
More informationSectigo Security Solution
Sectigo Email Security Solution 2018 Sectigo. All rights reserved. Email hacking is a commonly used malicious tactic in our increasingly connected world. Business email compromise (BEC), or email account
More informationLecture 6: Overview of Public-Key Cryptography and RSA
1 Lecture 6: Overview of Public-Key Cryptography and RSA Yuan Xue In this lecture, we give an overview to the public-key cryptography, which is also referred to as asymmetric cryptography. We will first
More informationRSA. Public Key CryptoSystem
RSA Public Key CryptoSystem DIFFIE AND HELLMAN (76) NEW DIRECTIONS IN CRYPTOGRAPHY Split the Bob s secret key K to two parts: K E, to be used for encrypting messages to Bob. K D, to be used for decrypting
More informationIntroduction to Cryptography. Vasil Slavov William Jewell College
Introduction to Cryptography Vasil Slavov William Jewell College Crypto definitions Cryptography studies how to keep messages secure Cryptanalysis studies how to break ciphertext Cryptology branch of mathematics,
More informationThe Security Problem
CSC 4103 - Operating Systems Spring 2007 Lecture - XX Protection and Security Tevfik Koşar Louisiana State University April 12 th, 2007 1 The Security Problem Security must consider external environment
More information