CRYPTOLOGY KEY MANAGEMENT CRYPTOGRAPHY CRYPTANALYSIS. Cryptanalytic. Brute-Force. Ciphertext-only Known-plaintext Chosen-plaintext Chosen-ciphertext
|
|
|
- Collin Barnett
- 5 years ago
- Views:
Transcription
1 CRYPTOLOGY CRYPTOGRAPHY KEY MANAGEMENT CRYPTANALYSIS Cryptanalytic Brute-Force Ciphertext-only Known-plaintext Chosen-plaintext Chosen-ciphertext 58
2 Types of Cryptographic Private key (Symmetric) Public key (Asymmetric) Hash functions 59
3 CRYPTOGRAPHY Private Key (Secret Key) Symmetric Public Key Asymmetric Hash Function 60
4 Symmetric Cipher Model 61
5 Symmetric Cipher Model 62
6 Secret Key Cryptography (SKC) plaintext encryption ciphertext ciphertext key decryption plaintext Using a single key for encryption/decryption. The plaintext and the ciphertext having the same size. Also called symmetric key cryptography 63
7 SKC: Security Uses Transmitting over an insecure channel The transmitted message is encrypted by the sender and can be decrypted by the receiver, with the same key Prevent attackers from eavesdropping Secure storage on insecure media Data is encrypted before being stored somewhere Only the entities knowing the key can decrypt it 64
8 SKC: Security Uses Authentication Strong authentication: proving knowledge of a secret without revealing it. Alice challenge r A Bob response r A encrypted with K A,B r B r B encrypted with K A,B 65
9 SKC: Security Uses Integrity Check Noncryptographic checksum Using a well-known algorithm to map a message (of arbitrary length) to a fixed-length checksum Protecting against accidental corruption of a message Example: CRC Cryptographic checksum A well-know algorithm Given a key and a message The algorithm produces a fixed-length message authentication code (MAC) that is sent with the message 66
10 Classic ciphers substitution ciphers monoalphabetic ciphers polyalphabetic ciphers transposition (permutation) ciphers product ciphers using both substitution, and transposition 67
11 Classical Cryptography Monoalphabetic Ciphers Once a key is chosen, each alphabetic character of a plaintext is mapped onto a unique alphabetic character of a ciphertext. The Substitution Cipher (Caesar Cipher) 68
12 The Caesar cipher The Caesar cipher is a substitution cipher, named after Julius Caesar. Operation principle: each letter is translated into the letter a fixed number of positions after it in the alphabet table. the fixed number of positions is a key both for encryption and decryption. 69
13 The Caesar cipher Outer: plaintext Inner: ciphertext 70
14 The Caesar cipher K=3 71
15 Caesar Cipher Mathematically, map letters to numbers: a, b, c,..., x, y, z 0, 1, 2,..., 23, 24, 25 Then the general Caesar cipher is: c = E K (p) = (p + k) mod 26 p = D K (c) = (c k) mod 26 Can be generalized with any alphabet. 72
16 Classical Cryptography Polyalphabetic Ciphers Each alphabetic character of a plaintext can be mapped onto m alphabetic characters of a ciphertext. Usually m is related to the encryption key. The Vigenère Cipher The Permutation Cipher 73
17 Substitution Cipher For each letter, substitute some other letter(randomly) A key determines what the substitution is E.g., 4, 8, 1, 26,... 1 st letter in the alphabet will be represented by the 4 th letter A D 2 nd letter will be represented by the 8 th B H 3 rd letter will be represented by the 1 st C A 4 th letter will be represented by the 26 th D Z 74
18 Example of Vigenère Cipher Keyword: deceptive key: deceptivedeceptivedeceptive plaintext: wearediscoveredsaveyourself ciphertext: ZICVTWQNGRZGVTWAVZHCQYGLMGJ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
19 Long Random Number Sequences Vernam Cipher A one-time Pad Cipher Use Numbers Mod 26 to represent Letters Use A two-digit Random Numbers Add the two numbers and take Mod 26 76
20 Vernam Cipher Example 77
21 Transpositions (Permutations) 78
22 Row Transposition Ciphers Plaintext is written row by row in a rectangle. Ciphertext: write out the columns in an order specified by a key. Key: Plaintext: Ciphertext: TTNAAPTMTSUOAODWCOIXKNLYPETZ 79 a t t a c k p o s t p o n e d u n t i l t w o a m x y z
23 Product Ciphers Uses a sequence of substitutions and transpositions Harder to break than just substitutions or transpositions ADFGVX Product Cipher This is a bridge from classical to modern ciphers. 80
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
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
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/
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
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
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
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
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
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
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
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
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
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,
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
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
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
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
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
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
Cryptography and Network Security Chapter 2
Cryptography and Network Security Chapter 2 Fourth Edition by William Stallings Lecture slides by Lawrie Brown Chapter 2 Classical Encryption Techniques Many savages at the present day regard their names
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
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
CLASSICAL CRYPTOGRAPHY. A Brief Reference for Self Build Crypto assignment
CLASSICAL CRYPTOGRAPHY A Brief Reference for Self Build Crypto assignment CLASSICAL CRYPTOGRAPHY Cryptography is the study of secret (crypto-) writing (-graphy) Concerned with developing algorithms which
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
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
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
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
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
Block Encryption and DES
Block Encryption and DES Plain Text Block 1 Block 2 Block 3 Overview Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Audio/Video recordings of this lecture are available
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,
Introduction 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
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
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
Worksheet - Reading Guide for Keys and Passwords
Unit 2 Lesson 15 Name(s) Period Date Worksheet - Reading Guide for Keys and Passwords Background Algorithms vs. Keys. An algorithm is how to execute the encryption and decryption and key is the secret
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
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:
UNIT 2 CLASSICAL ENCRYPTION TECHNIQUES
CRYPTOGRAPHY AND NETWORK SECURITY UNIT 2 UNIT 2 CLASSICAL ENCRYPTION TECHNIQUES SYMMETRIC ENCRYPTION SOME BASIC TERMINOLOGY or conventional / private-key / single-key sender and recipient share a common
Introduction to Symmetric Cryptography
Introduction to Symmetric Cryptography Tingting Chen Cal Poly Pomona 1 Some slides are from Dr. Cliff Zou. www.cs.ucf.edu/~czou/cis3360-12/ch08-cryptoconcepts.ppt Basic Cryptography Private Key Cryptography
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
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
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
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
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
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
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
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
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
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)
UNIT - II Traditional Symmetric-Key Ciphers. Cryptography & Network Security - Behrouz A. Forouzan
UNIT - II Traditional Symmetric-Key Ciphers 1 Objectives To define the terms and the concepts of symmetric key ciphers To emphasize the two categories of traditional ciphers: substitution and transposition
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:
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
Cryptography Symmetric Encryption Class 2
Cryptography Symmetric Encryption Class 2 Stallings: Ch 3 & 6 Stallings: Ch 4 CEN-5079: 18.January.2018 1 Symmetric Cryptosystems Encryption Key Decryption Key Plaintext Plaintext Encryption Algorithm
Classic Cryptography: From Caesar to the Hot Line
Classic Cryptography: From Caesar to the Hot Line Wenyuan Xu Department of Computer Science and Engineering University of South Carolina Overview of the Lecture Overview of Cryptography and Security Classical
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
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 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
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
Cryptography Introduction
Cryptography Introduction Last Updated: Aug 20, 2013 Terminology Access Control o Authentication Assurance that entities are who they claim to be o Authorization Assurance that entities have permission
CCNA Security 1.1 Instructional Resource
CCNA Security 1.1 Instructional Resource Chapter 7 Cryptographic Systems 2012 Cisco and/or its affiliates. All rights reserved. 1 Explain how cryptology consists of cryptography (encoding messages) and
Introduction to Cryptography. Lecture 1. Benny Pinkas. Administrative Details. Bibliography. In the Library
Administrative Details Introduction to Cryptography Lecture 1 Benny Pinkas Grade Exam 75% Homework 25% (might include programming) Office hours: Wednesday, 12-13. Email: benny@cs.haifa.ac.il Web page:
Introduction to Cryptography. Lecture 1
Introduction to Cryptography Lecture 1 Benny Pinkas page 1 1 Administrative Details Grade Exam 75% Homework 25% (might include programming) Office hours: Wednesday, 12-13. Email: benny@cs.haifa.ac.il Web
CNT4406/5412 Network Security
CNT4406/5412 Network Security Introduction to Cryptography Zhi Wang Florida State University Fall 2014 Zhi Wang (FSU) CNT4406/5412 Network Security Fall 2014 1 / 18 Introduction What is Cryptography Mangling
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
06/02/ Local & Metropolitan Area Networks. 0. Overview. Terminology ACOE322. Lecture 8 Network Security
1 Local & Metropolitan Area Networks ACOE322 Lecture 8 Network Security Dr. L. Christofi 1 0. Overview As the knowledge of computer networking and protocols has become more widespread, so the threat of
COMM1003. Information Theory. Dr. Wassim Alexan Spring Lecture 4
COMM1003 Information Theory Dr. Wassim Alexan Spring 2018 Lecture 4 Cryptology Cryptology is the most general term and it splits into two parts: Cryptography and Cryptanalysis Cryptography is the 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,
Principles of Information Security, Fourth Edition. Chapter 8 Cryptography
Principles of Information Security, Fourth Edition Chapter 8 Cryptography Learning Objectives Upon completion of this material, you should be able to: Chronicle the most significant events and discoveries
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
PROTECTING CONVERSATIONS
PROTECTING CONVERSATIONS Basics of Encrypted Network Communications Naïve Conversations Captured messages could be read by anyone Cannot be sure who sent the message you are reading Basic Definitions Authentication
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,
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
ELECTRONICS DEPARTMENT
ELECTRONICS DEPARTMENT By Eng. 28 th Mar MUSTAFA 2012 M. Efficient SHIPLEImplementation of AES Algorithm Immune to DPA Attack Cryptography processing plaintext cipher text format Block Cipher Stream Cipher
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
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
COMP4109 : Applied Cryptography
COMP4109 : Applied Cryptography Fall 2013 M. Jason Hinek Carleton University Applied Cryptography Day 4 (and 5 and maybe 6) secret-key primitives symmetric-key encryption security notions and types of
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
Security+ 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
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
Cryptography Symmetric Cryptography Asymmetric Cryptography Internet Communication. Telling Secrets. Secret Writing Through the Ages.
Telling Secrets Secret Writing Through the Ages William Turner Department of Mathematics & Computer Science Wabash College Crawfordsville, IN 47933 Tuesday 4 February 2014 W. J. Turner Telling Secrets
Garantía 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
LECTURE 4: Cryptography
CSC 519 Information Security LECTURE 4: Cryptography Dr. Esam A. Alwagait alwagait@ksu.edu.sa Recap form previous Lecture We discussed more symmetric encryption. Books? Security Engineering, Ross Anderson
Network Security 網路安全. Lecture 3 March 16, 2015 洪國寶
Network Security 網路安全 Lecture 3 March 16, 2015 洪國寶 1 Outline Review: Symmetric encryption -- Classical techniques (Cont.) Symmetric encryption -- Modern techniques secure encryption schemes modern symmetric
Ref:
Cryptography & digital signature Dec. 2013 Ref: http://cis.poly.edu/~ross/ 2 Cryptography Overview Symmetric Key Cryptography Public Key Cryptography Message integrity and digital signatures References:
7. Symmetric encryption. symmetric cryptography 1
CIS 5371 Cryptography 7. Symmetric encryption symmetric cryptography 1 Cryptographic systems Cryptosystem: t (MCKK GED) (M,C,K,K,G,E,D) M, plaintext message space C, ciphertext message space K, K, encryption
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
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
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
Innovation and Cryptoventures. Cryptology. Campbell R. Harvey. Duke University and NBER
Innovation and Cryptoventures Cryptology Campbell R. Harvey Duke University and NBER Campbell R. Harvey 2018 Overview Cryptology Cryptography Cryptanalysis Symmetric Ciphers Asymmetric Ciphers Protocols
Multi-Level Encryption using SDES Key Generation Technique with Genetic Algorithm
www.ijecs.in International Journal Of Engineering And Computer Science ISSN:2319-7242 Volume - 3 Issue - 8 August, 2014 Page No. 7596-7576 Multi-Level Encryption using SDES Key Generation Technique with
Exploring Cryptography Using CrypTool
NEMATYC 2018 Exploring Cryptography Using CrypTool Valeria D Orazio Massachusetts Maritime Academy Importance of Cryptography 1998 Project start Originated as an internal business application for information
Chapter 8 Security. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012
Chapter 8 Security A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the animations; and can add,
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.
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,
Introduction to Network Security Missouri S&T University CPE 5420 Data Encryption Standard
Introduction to Network Security Missouri S&T University CPE 5420 Data Encryption Standard Egemen K. Çetinkaya Egemen K. Çetinkaya Department of Electrical & Computer Engineering Missouri University of
CS 332 Computer Networks Security
CS 332 Computer Networks Security Professor Szajda Last Time We talked about mobility as a matter of context: How is mobility handled as you move around a room? Between rooms in the same building? As your
Introduction to Software Security Crypto Basics (Chapter 2)
Introduction to Software Security Crypto Basics (Chapter 2) Seong-je Cho Spring 2018 Computer Security & Operating Systems Lab, DKU Textbook Sources / References M. T. Goodrich and R. Tamassia, Introduction
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,
Cryptology Part 1. Terminology. Basic Approaches to Cryptography. Basic Approaches to Cryptography: (1) Transposition (continued)
Cryptology Part 1 Uses of Cryptology 1. Transmission of a message with assurance that the contents will be known only by sender and recipient a) Steganography: existence of the message is hidden b) Cryptography:
Encryption. INST 346, Section 0201 April 3, 2018
Encryption INST 346, Section 0201 April 3, 2018 Goals for Today Symmetric Key Encryption Public Key Encryption Certificate Authorities Secure Sockets Layer Simple encryption scheme substitution cipher: