Introduction to Cryptography
|
|
|
- Buddy Miller
- 5 years ago
- Views:
Transcription
1 T H E U N I V E R S I T Y O F B R I T I S H C O L U M B I A Introduction to Cryptography EECE 412 Session 3 Copyright 2004 Konstantin Beznosov
2 Session Outline Historical background Caesar and Vigenère ciphers One-time pad One-way functions Asymmetric cryptosystems The Random Oracle model Random functions: Hash functions Random generators: stream ciphers Random Permutations: block ciphers Public key encryption and trapdoor one-way permutations Digital signatures 2
3 T H E U N I V E R S I T Y O F B R I T I S H C O L U M B I A Historical Background Copyright 2004 Konstantin Beznosov
4 4 Letter Indices in English Alphabet M L K J I H G F E D C B A 18 S z Y X W V U T R Q P O N
5 Caesar Cipher Plaintext is HELLO WORLD Change each letter to the third letter following it (X goes to A, Y to B, Z to C) Key is 3, usually written as letter D C = P + K mod 26 Ciphertext: KHOOR ZRUOG Plain HELLOWORLD Key Cipher DDDDDDDDDD KHOORZRUOG 5
6 Monoalphabetic Cipher Invented by Arabs in 8th or 9th centuries A F B T C D W S E G F M G P H A I Z J C K L L V M N O D.... Z B Plain Key Cipher HELLOWORLD AGVVYEYEVS HKGGMAMVGV 6
7 Polyalphabetic Vigenère Cipher proposed by Blaise de Vigenere from the court of Henry III of France in the sixteenth century Like Cæsar cipher, but use a phrase Example Message: TO BE OR NOT TO BE THAT IS THE QUESTION Key: RELATIONS Encipher using Cæsar cipher for each letter: Plain TO BE OR NOT TO BE TH AT IS THE QUESTION Key RE LA T I ONS RE LA T I ON SR ELA T I ONSREL Cipher KS ME HZ BBL KS ME MPOG AJ XSE J CSFLZSY 7
8 Cryptanalysis of Vigenère Cipher Factoring of distances KSMEHZBBLKSMEMPOGAJXSEJCSFLZSY Statistical analysis of each Caeser cipher group KKJZ 1. SSXS 2. MMSY 3. EEE 4. HMJ 5. ZPC 6. BOS 7. BGF 8. LAL 8
9 One-Time Pad A Vigenère cipher with a random key at least as long as the message Provably unbreakable Why? Plain text Key Cipher text D O I T A J I Y D X Q R D O N T A J D Y D X Q R Warning: keys must be random, or you can attack the cipher by trying to regenerate the key 9
10 Asymmetric Cryptosystems Public key and private key Encryption Signatures Sep. 21st & 23rd 10
11 T H E U N I V E R S I T Y O F B R I T I S H C O L U M B I A Random Oracle Model Copyright 2004 Konstantin Beznosov
12 What is Random Oracle Model? Queries Responses source of randomness infinite storage 12
13 Random Function as Random Oracle In: string of any length Queries Responses Out: random string of fixed length Applications: One-way functions Hash functions Message digests Time stamping Properties One-wayness No input inference from output Few collisions 13
14 Random Generator (Stream Cipher) as Random Oracle In: short string (key) Queries Responses Out: long random stream of bits (keystream) Applications: Communications encryption Storage encryption Properties Should not reuse Use seed 14
15 Random Permutation (Block Cipher) as Random Oracle In fixed size short string (plaintext) M, DES bits Key K Queries Responses K 1 K 2 Out same fixed size short string (ciphertext) C Notation C = { M } K M = { C } K Properties Invertible 15
16 Attacks on Block Ciphers Attack types Known plaintext attack Chosen plaintext attack Chosen ciphertext attack Chosen plaintext/ciphertext attack Related key attack (K +1, K + 2, etc.) Attack objectives Deduce the answer to the query which the attacker has not made yet-- forgery attacks Recover the key--key recover attacks Why attack types are important? DES 2 47 chosen plain texts 2 43 known plain texts Queries Responses K 1 K 2 16
17 Public Key Encryption and Trap-door One-Way Permutation as Random Oracle Public Key Encryption Scheme: Key pair (KR, KR -1 ) generation function from random string R KR KR -1 is infeasible C = {M) KR M = {C) KR -1 Queries Responses H(K 1 ) K 1 H(K 2 ) K2 In: fixed size short string (plaintext) M, Key KR Out: fixed size short string (ciphertext) C 17
18 Digital Signature as Random Oracle Public Key Signature Scheme: Key pair (σr, VR) generation function VR σr is infeasible S = Sig σr (M) {True, False} = Ver VR (S) Queries Responses H(K 1 ) K 1 H(K 2 ) K2 Input Output Signing Any string M + σr S = hash(m) cipher block Verifying S + VR True or False 18
19 Historical background Summary Caesar and Vigenère ciphers One-time pad One-way functions Asymmetric cryptosystems The Random Oracle model Queries Responses Random functions: Hash functions Random generators: stream ciphers Random Permutations: block ciphers Public key encryption and trapdoor one-way permutations Digital signatures 19
T H E U N I V E R S I T Y O F B R I T I S H C O L U M B I A. Introduction to Cryptography
T H E U N I V E R S I T Y O F B R I T I S H C O L U M B I A Introduction to Cryptography 1 Module Outline Historical background Classic ciphers One-time pad The Random Oracle model Random functions: Hash
Introduction to Cryptography. In the News: Hacker exposes embassies'
T H E U N I V E R S I T Y O F B R I T I S H C O L U M B I A Introduction to Cryptography EECE 412 Copyright 2004-2007 Konstantin Beznosov In the News: Hacker exposes embassies' e-mail A Swedish security
Cryptography Part II Introduction to Computer Security. Chapter 8
Cryptography Part II Introduction to Computer Security Chapter 8 Vigènere Cipher Like Cæsar cipher, but use phrase Example Message: THE BOY HAS THE BALL Key: VIG Encipher using Cæsar cipher for each letter:
Classical 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
CRYPTOLOGY 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
Lecture 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
Security: 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
Cryptography and Network Security 2. Symmetric Ciphers. Lectured by Nguyễn Đức Thái
Cryptography and Network Security 2. Symmetric Ciphers Lectured by Nguyễn Đức Thái Outline Symmetric Encryption Substitution Techniques Transposition Techniques Steganography 2 Symmetric Encryption There
IS 2150 / TEL 2810 Information Security and Privacy
IS 2150 / TEL 2810 Information Security and Privacy James Joshi Associate Professor, SIS Lecture 1 Aug 28, 2013 Basic Cryptography Network Security 1 Objectives Understand/explain/employ the basic cryptographic
Traditional Symmetric-Key Ciphers. A Biswas, IT, BESU Shibpur
Traditional Symmetric-Key Ciphers A Biswas, IT, BESU Shibpur General idea of symmetric-key cipher The original message from Alice to Bob is called plaintext; the message that is sent through the channel
2/7/2013. CS 472 Network and System Security. Mohammad Almalag Lecture 2 January 22, Introduction To Cryptography
CS 472 Network and System Security Mohammad Almalag malmalag@cs.odu.edu Lecture 2 January 22, 2013 Introduction To Cryptography 1 Definitions Cryptography = the science (art) of encryption Cryptanalysis
Substitution Ciphers, continued. 3. Polyalphabetic: Use multiple maps from the plaintext alphabet to the ciphertext alphabet.
Substitution Ciphers, continued 3. Polyalphabetic: Use multiple maps from the plaintext alphabet to the ciphertext alphabet. Non-periodic case: Running key substitution ciphers use a known text (in a standard
Introduction to Cryptography CS 136 Computer Security Peter Reiher October 9, 2014
Introduction to Cryptography CS 136 Computer Security Peter Reiher October 9, 2014 Page 1 Outline What is data encryption? Cryptanalysis Basic encryption methods Substitution ciphers Permutation ciphers
CSCI 454/554 Computer and Network Security. Topic 2. Introduction to Cryptography
CSCI 454/554 Computer and Network Security Topic 2. Introduction to Cryptography Outline Basic Crypto Concepts and Definitions Some Early (Breakable) Cryptosystems Key Issues 2 Basic Concepts and Definitions
Outline Basics of Data Encryption CS 239 Computer Security January 24, 2005
Outline Basics of Data Encryption CS 239 Computer Security January 24, 2005 What is data encryption? Basic encryption mechanisms Stream and block ciphers Characteristics of good ciphers Page 1 Page 2 Data
Cryptography 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
Classical Encryption Techniques
Encryption CSS322: Security and Cryptography Sirindhorn International Institute of Technology Thammasat University Prepared by Steven Gordon on 29 December 2011 CSS322Y11S2L02, Steve/Courses/2011/S2/CSS322/Lectures/classical.tex,
Basic Concepts and Definitions. CSC/ECE 574 Computer and Network Security. Outline
CSC/ECE 574 Computer and Network Security Topic 2. Introduction to Cryptography 1 Outline Basic Crypto Concepts and Definitions Some Early (Breakable) Cryptosystems Key Issues 2 Basic Concepts and Definitions
Computer 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
Chapter 3 Traditional Symmetric-Key Ciphers 3.1
Chapter 3 Traditional Symmetric-Key Ciphers 3.1 Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 3 Objectives To define the terms and the concepts of symmetric
Cryptography MIS
Cryptography MIS-5903 http://community.mis.temple.edu/mis5903sec011s17/ Cryptography History Substitution Monoalphabetic Polyalphabetic (uses multiple alphabets) uses Vigenere Table Scytale cipher (message
9/30/2016. 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
OVE EDFORS ELECTRICAL AND INFORMATION TECHNOLOGY
1 Information Transmission Chapter 6 Cryptology OVE EDFORS ELECTRICAL AND INFORMATION TECHNOLOGY Learning outcomes After this lecture the student should undertand what cryptology is and how it is used,
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
Overview of Conventional Encryption Techniques
Overview of Conventional Encryption Techniques Shadab Pasha CDGI,Indore shadabpasha@gmail.com Abstract: Symmetric Encryption or Single-key Encryption or Conventional Encryption was only the type of encryption
Outline. Cryptography. Encryption/Decryption. Basic Concepts and Definitions. Cryptography vs. Steganography. Cryptography: the art of secret writing
Outline CSCI 454/554 Computer and Network Security Basic Crypto Concepts and Definitions Some Early (Breakable) Cryptosystems Key Issues Topic 2. Introduction to Cryptography 2 Cryptography Basic Concepts
Classical Encryption Techniques. CSS 322 Security and Cryptography
Classical Encryption Techniques CSS 322 Security and Cryptography Contents Terminology and Models Requirements, Services and Attacks Substitution Ciphers Caesar, Monoalphabetic, Polyalphabetic, One-time
L2. An Introduction to Classical Cryptosystems. Rocky K. C. Chang, 23 January 2015
L2. An Introduction to Classical Cryptosystems Rocky K. C. Chang, 23 January 2015 This and the next set of slides 2 Outline Components of a cryptosystem Some modular arithmetic Some classical ciphers Shift
Introduction. 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
Chapter 2: Classical Encryption Techniques
CPE 542: CRYPTOGRAPHY & NETWORK SECURITY Chapter 2: Classical Encryption Techniques Dr. Lo ai Tawalbeh Computer Engineering Department Jordan University of Science and Technology Jordan Introduction Basic
Information Systems Security
Information Systems Security Dr. Ayman Abdel-Hamid College of Computing and Information Technology Arab Academy for Science & Technology and Maritime Transport Chapter 2 Classical Encryption Techniques
EEC-484/584 Computer Networks
EEC-484/584 Computer Networks Lecture 23 wenbing@ieee.org (Lecture notes are based on materials supplied by Dr. Louise Moser at UCSB and Prentice-Hall) Outline 2 Review of last lecture Introduction to
Cryptography and Network Security. Lecture 02 Symmetric Encryption. Ediz ŞAYKOL
Cryptography and Network Security Lecture 02 Symmetric Encryption Ediz ŞAYKOL Symmetric Encryption or conventional / private-key / single-key sender and recipient share a common key all classical encryption
Sankalchand Patel College of Engineering, Visnagar B.E. Semester V (CE/IT) INFORMATION SECURITY Practical List
1. IMPLEMENT CAESAR CIPHER WITH VARIABLE KEY It is an encryption technique in which each plaintext letter is to be replaced with one a fixed number of places (in following implementation, key) down the
EEC-682/782 Computer Networks I
EEC-682/782 Computer Networks I Lecture 23 Wenbing Zhao wenbingz@gmail.com http://academic.csuohio.edu/zhao_w/teaching/eec682.htm (Lecture nodes are based on materials supplied by Dr. Louise Moser at UCSB
CIS 4360 Secure Computer Systems Symmetric Cryptography
CIS 4360 Secure Computer Systems Symmetric Cryptography Professor Qiang Zeng Spring 2017 Previous Class Classical Cryptography Frequency analysis Never use home-made cryptography Goals of Cryptography
Glenda Whitbeck Global Computing Security Architect Spirit AeroSystems
Glenda Whitbeck Global Computing Security Architect Spirit AeroSystems History 2000 B.C. Egyptian Hieroglyphics Atbash - Hebrew Original alphabet mapped to different letter Type of Substitution Cipher
ENGR/CS 101 CS Session Lecture 5
ENGR/CS 101 CS Session Lecture 5 No programming today Submission system will be demonstrated at the end of class. Lecture 5 ENGR/CS 101 Computer Science Session 1 Outline Problem: How to send a secret
CRYPTOGRAPHY. 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
CIT 380: Securing Computer Systems. Symmetric Cryptography
CIT 380: Securing Computer Systems Symmetric Cryptography Topics 1. Modular Arithmetic 2. What is Cryptography? 3. Transposition Ciphers 4. Substitution Ciphers 1. Cæsar cipher 2. Vigènere cipher 5. Cryptanalysis:
CSCE 813 Internet Security Symmetric Cryptography
CSCE 813 Internet Security Symmetric Cryptography Professor Lisa Luo Fall 2017 Previous Class Essential Internet Security Requirements Confidentiality Integrity Authenticity Availability Accountability
Cryptography and Network Security
Cryptography and Network Security Third Edition by William Stallings Lecture slides by Lawrie Brown Basic Terminology plaintext - the original message ciphertext - the coded message cipher - algorithm
Nature Sunday Academy Lesson Plan
Title Computer Security Description: Nature Sunday Academy Lesson Plan 2013-14 The objective of the lesson plan aims to help students to understand the general goals of security, the essential concerns
CSC 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
ICT 6541 Applied Cryptography. Hossen Asiful Mustafa
ICT 6541 Applied Cryptography Hossen Asiful Mustafa Basic Communication Alice talking to Bob Alice Bob 2 Eavesdropping Eve listening the conversation Alice Bob 3 Secure Communication Eve listening the
CHAPTER 1 INTRODUCTION TO CRYPTOGRAPHY. Badran Awad Computer Department Palestine Technical college
CHAPTER 1 INTRODUCTION TO CRYPTOGRAPHY Badran Awad Computer Department Palestine Technical college CHAPTER 1 Introduction Historical ciphers Information theoretic security Computational security Cryptanalysis
Cryptography Introduction to Computer Security. Chapter 8
Cryptography Introduction to Computer Security Chapter 8 Introduction Cryptology: science of encryption; combines cryptography and cryptanalysis Cryptography: process of making and using codes to secure
Classical Encryption Techniques
Classical Encryption Techniques Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Audio/Video recordings of this lecture are available at: http://www.cse.wustl.edu/~jain/cse571-14/
Introduction to Cryptology. Lecture 2
Introduction to Cryptology Lecture 2 Announcements Access to Canvas? 2 nd Edition vs. 1 st Edition HW1 due on Tuesday, 2/7 Discrete Math Readings/Quizzes on Canvas due on Tuesday, 2/14 Agenda Last time:
Public-Key Cryptanalysis
http://www.di.ens.fr/ pnguyen INRIA and École normale supérieure, Paris, France MPRI, 2010 Outline 1 Introduction Asymmetric Cryptology Course Overview 2 Textbook RSA 3 Euclid s Algorithm Applications
Cryptography and Network Security. Sixth Edition by William Stallings
Cryptography and Network Security Sixth Edition by William Stallings Chapter 9 Public Key Cryptography and RSA Misconceptions Concerning Public-Key Encryption Public-key encryption is more secure from
CSCE 715: Network Systems Security
CSCE 715: Network Systems Security Chin-Tser Huang huangct@cse.sc.edu University of South Carolina 01/20/2015 2 Cryptography Study of schemes used for encryption Can be characterized by type of encryption
Cryptography and Network Security
Cryptography and Network Security Spring 2012 http://users.abo.fi/ipetre/crypto/ Lecture 14: Folklore, Course summary, Exam requirements Ion Petre Department of IT, Åbo Akademi University 1 Folklore on
Cryptography Functions
Cryptography Functions Lecture 3 1/29/2013 References: Chapter 2-3 Network Security: Private Communication in a Public World, Kaufman, Perlman, Speciner Types of Cryptographic Functions Secret (Symmetric)
Other Topics in Cryptography. Truong Tuan Anh
Other Topics in Cryptography Truong Tuan Anh 2 Outline Public-key cryptosystem Cryptographic hash functions Signature schemes Public-Key Cryptography Truong Tuan Anh CSE-HCMUT 4 Outline Public-key cryptosystem
2
1 2 3 4 5 Basic Terminology plaintext - the original message ciphertext - the coded message cipher - algorithm for transforming plaintext to ciphertext key - info used in cipher known only to sender/receiver
Cryptographic Techniques. Information Technologies for IPR Protections 2003/11/12 R107, CSIE Building
Cryptographic Techniques Information Technologies for IPR Protections 2003/11/12 R107, CSIE Building Outline Data security Cryptography basics Cryptographic systems DES RSA C. H. HUANG IN CML 2 Cryptography
Tuesday, January 17, 17. Crypto - mini lecture 1
Crypto - mini lecture 1 Cryptography Symmetric key cryptography (secret key crypto): sender and receiver keys identical Asymmetric key cryptography (public key crypto): encryption key public, decryption
Cryptography. Submitted to:- Ms Poonam Sharma Faculty, ABS,Manesar. Submitted by:- Hardeep Gaurav Jain
Cryptography Submitted to:- Ms Poonam Sharma Faculty, ABS,Manesar Submitted by:- Hardeep Gaurav Jain Cryptography Cryptography, a word with Greek origins, means "secret writing." However, we use the term
PART I Symmetric Ciphers
PART I Symmetric Ciphers CHAPTER 2 Classical Encryption Techniques Cryptography, Cryptanalysis Caesar cipher, Monoalphabetic ciphers Playfair cipher, Hill cipher Polyalphabetic ciphers One-time Pad 2.3
Public 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,
Cryptosystems. Truong Tuan Anh CSE-HCMUT
Cryptosystems Truong Tuan Anh CSE-HCMUT anhtt@hcmut.edu.vn 2 In This Lecture Cryptography Cryptosystem: Definition Simple Cryptosystem Shift cipher Substitution cipher Affine cipher Cryptanalysis Cryptography
Cryptography (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
Sankalchand 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
ECE 646 Fall 2008 Multiple-choice test
ECE 646 Fall 2008 Multiple-choice test 1. (1 pt) Arrange the following ciphers in the order of the increasing measure of roughness for the ciphertext obtained by encrypting 1000-letter message with a given
Shared Secret = Trust
Trust The fabric of life! Holds civilizations together Develops by a natural process Advancement of technology results in faster evolution of societies Weakening the natural bonds of trust From time to
Introduction to Network Security Missouri S&T University CPE 5420 Cryptology Overview
Introduction to Network Security Missouri S&T University CPE 5420 Cryptology Overview Egemen K. Çetinkaya Egemen K. Çetinkaya Department of Electrical & Computer Engineering Missouri University of Science
Classical Cryptography
Classical Cryptography Chester Rebeiro IIT Madras STINSON : chapter 1 Ciphers Symmetric Algorithms Encryption and Decryption use the same key i.e. K E = K D Examples: Block Ciphers : DES, AES, PRESENT,
Behrang Noohi. 22 July Behrang Noohi (QMUL) 1 / 18
Behrang Noohi School of Mathematical Sciences Queen Mary University of London 22 July 2014 Behrang Noohi (QMUL) 1 / 18 Introduction Secure Communication How can one send a secret message? Steganography
Module 13 Network Security. Version 1 ECE, IIT Kharagpur
Module 13 Network Security Lesson 40 Network Security 13.1.1 INTRODUCTION Network Security assumes a great importance in the current age. In this chapter we shall look at some of the security measures
Outline. Data Encryption Standard. Symmetric-Key Algorithms. Lecture 4
EEC 693/793 Special Topics in Electrical Engineering Secure and Dependable Computing Lecture 4 Department of Electrical and Computer Engineering Cleveland State University wenbing@ieee.org Outline Review
Module 1: Classical Symmetric Ciphers
Module 1: Classical Symmetric Ciphers Dr. Natarajan Meghanathan Professor of Computer Science Jackson State University E-mail: natarajan.meghanathan@jsums.edu Introduction to Cryptography Terms and Concepts
Introduction 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,
A 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
Conventional Encryption Principles Conventional Encryption Algorithms Cipher Block Modes of Operation Location of Encryption Devices Key Distribution
Ola Flygt Växjö University, Sweden http://w3.msi.vxu.se/users/ofl/ Ola.Flygt@vxu.se +46 470 70 86 49 1 Conventional Encryption Principles Conventional Encryption Algorithms Cipher Block Modes of Operation
10/3/2017. Cryptography and Network Security. Sixth Edition by William Stallings
Cryptography and Network Security Sixth Edition by William Stallings 1 Chapter 2 Classical Encryption Techniques "I am fairly familiar with all the forms of secret writings, and am myself the author of
RSA. 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
Textbook: Ahmet Burak Can Hacettepe University. Supplementary books:
Basic Ciphers Ahmet Burak Can Hacettepe University abc@hacettepe.edu.tr Books Textbook: Network Security: Private Communication in a Public World, 2nd Edition. C. Kaufman, R. Perlman, and M. Speciner,
Study Guide to Mideterm Exam
YALE UNIVERSITY DEPARTMENT OF COMPUTER SCIENCE CPSC 467b: Cryptography and Computer Security Handout #7 Professor M. J. Fischer February 20, 2012 Study Guide to Mideterm Exam For the exam, you are responsible
Cryptography Math/CprE/InfAs 533
Unit 1 January 10, 2011 1 Cryptography Math/CprE/InfAs 533 Unit 1 January 10, 2011 2 Instructor: Clifford Bergman, Professor of Mathematics Office: 424 Carver Hall Voice: 515 294 8137 fax: 515 294 5454
Survey: Recent Modifications in Vigenere Cipher
IOSR Journal of Computer Engineering (IOSR-JCE) e-issn: 2278-0661, p- ISSN: 2278-8727Volume 16, Issue 2, Ver. IX (Mar-Apr. 2014), PP 49-53 Survey: Recent Modifications in Vigenere Cipher Ranju S Kartha
Security Analysis and Modification of Classical Encryption Scheme
Indian Journal of Science and Technology, Vol 8(S8), 542 548, April 205 ISSN (Print) : 0974-6846 ISSN (Online) : 0974-5645 DOI: 0.7485/ijst/205/v8iS8/7506 Security Analysis and Modification of Classical
Polyalphabetic cyphers
Unit 7 January 26, 2011 1 Polyalphabetic cyphers Let E 1, E 2,..., E n be distinct substitution cyphers. To encrypt a plaintext message P = p 1 p 2 p 3... apply the E i (i = 1,..., n) cyclically to the
Lecture 2: Shared-Key Cryptography
Graduate Course on Computer Security Lecture 2: Cryptography Iliano Cervesato iliano@itd.nrl.navy.mil ITT Industries, Inc @ NRL Washington DC http://www.cs.stanford.edu/~iliano/ DIMI, Universita di Udine,
CSC 580 Cryptography and Computer Security
CSC 580 Cryptography and Computer Security Encryption Concepts, Classical Crypto, and Binary Operations January 30, 2018 Overview Today: Cryptography concepts and classical crypto Textbook sections 3.1,
Introduction to cryptography
Chapter 1 Introduction to cryptography 1.1 From caesar cipher to public key cryptography Cryptography: is the practical means for protecting information transmitted through public communications networks,
CSEC 507: APPLIED CRYPTOLOGY Historical Introduction to Cryptology
CSEC 507: APPLIED CRYPTOLOGY Middle East Technical University Ankara, Turkey Last Modified: December 9, 2015 Created: August 5, 2015 What is Cryptology, Cryptography, and Cryptanalysis? (A Short) Definition
Network Security Technology Project
Network Security Technology Project Shanghai Jiao Tong University Presented by Wei Zhang zhang-wei@sjtu.edu.cn!1 Part I Implement the textbook RSA algorithm. The textbook RSA is essentially RSA without
Cryptography and secure channel. May 17, Networks and Security. Thibault Debatty. Outline. Cryptography. Public-key encryption
and secure channel May 17, 2018 1 / 45 1 2 3 4 5 2 / 45 Introduction Simplified model for and decryption key decryption key plain text X KE algorithm KD Y = E(KE, X ) decryption ciphertext algorithm X
Cryptography Intro and RSA
Cryptography Intro and RSA Well, a gentle intro to cryptography, followed by a description of public key crypto and RSA. 1 Definition Cryptology is the study of secret writing Concerned with developing
Introduction to Cryptography
Introduction to Cryptography Jiyou Li lijiyou at sjtu.edu.cn Department of Mathematics, Shanghai Jiao Tong University Sep. 17th, 2013 Cryptography Cryptography: the art and science of keeping message secure.
Solutions to exam in Cryptography December 17, 2013
CHALMERS TEKNISKA HÖGSKOLA Datavetenskap Daniel Hedin DIT250/TDA351 Solutions to exam in Cryptography December 17, 2013 Hash functions 1. A cryptographic hash function is a deterministic function that
JNTU World JNTU World. JNTU World. Cryptography and Network Security. Downloaded From JNTU World (http://(http:// )(http:// )JNTU World
Cryptography and Network Security )(http:// ) Downloaded From (http://(http:// )(http:// ) Downloaded From (http://(http:// Introduction The art of war teaches us not on the likelihood of the enemy s not
APNIC elearning: Cryptography Basics
APNIC elearning: Cryptography Basics 27 MAY 2015 03:00 PM AEST Brisbane (UTC+10) Issue Date: Revision: Introduction Presenter Sheryl Hermoso Training Officer sheryl@apnic.net Specialties: Network Security
CSC 774 Network Security
CSC 774 Network Security Topic 2. Review of Cryptographic Techniques CSC 774 Dr. Peng Ning 1 Outline Encryption/Decryption Digital signatures Hash functions Pseudo random functions Key exchange/agreement/distribution
Introduction to Cryptology ENEE 459E/CMSC 498R. Lecture 1 1/26/2017
Introduction to Cryptology ENEE 459E/CMSC 498R Lecture 1 1/26/2017 Syllabus Highlights Best way to contact me is via email: danadach@ece.umd.edu My office hours; Thurs 3:00-4:00pm, Friday, 12:00-1pm in
Some Stuff About Crypto
Some Stuff About Crypto Adrian Frith Laboratory of Foundational Aspects of Computer Science Department of Mathematics and Applied Mathematics University of Cape Town This work is licensed under a Creative
File and Disk Encryption
File and Disk Encryption Alex Applegate 1 Overview Common Weak Encryption Stronger Methods Threat From File Encryption Full Disk Encryption (FDE) Threat From FDE 2 Common Types of Weak File Encryption
Cyber Security Applied Cryptography. Dr Chris Willcocks
Cyber Security Applied Cryptography Dr Chris Willcocks Introduction 1. Content in this lecture will be examinable 2. This is a single lecture on applied cryptography for computer security. there is an
Cryptography. Dr. Ahmad Almulhem. Spring Computer Engineering Department, KFUPM. Ahmad Almulhem - Network Security Engineering / 84
Cryptography Dr. Ahmad Almulhem Computer Engineering Department, KFUPM Spring 2008 Ahmad Almulhem - Network Security Engineering - 2008 1 / 84 Outline Cryptography Cryptosystem Attacks Part I Overview