Vigenère Tableau Reference –Matt Bishop, Computer Security, Addison Wesley, 2003.

Slides:

Advertisements

Similar presentations

CAP Cryptographic Analysis Program

Advertisements

SE 441 INFORMATION SYSTEMS SECURITY Early Ciphers.

Computer Science 101 Data Encryption And Computer Networks.

Announcements: Please pass in Assignment 1 now. Please pass in Assignment 1 now. Assignment 2 posted (when due?) Assignment 2 posted (when due?)Questions?

Announcements: Matlab: tutorial available at Matlab: tutorial available at

ICS 454: Principles of Cryptography

CYPHER INDEX n Introduction n Background n Demo INTRODUCTION n Cypher is a software toolkit designed to aid in the decryption of standard (historical)

CPSC CPSC 3730 Cryptography Chapter 2 Classical Encryption Techniques.

Cryptography Introduction, continued. Sufficient key space principle If an encryption scheme has a key space that is too small, then it will be vulnerable.

Block and Stream Ciphers1 Reference –Matt Bishop, Computer Security, Addison Wesley, 2003.

A Cryptography Education Tool Anna Yu Department of Computer Science College of Engineering North Carolina A&T State University June 18, 2009.

Cryptanalysis of the Vigenere Cipher Using Signatures and Scrawls To break a Vigenere cipher you need to know the keyword length. – The Kasiski and Friedman.

Computer System Security CSE 5339/7339

Chapter 2 – Elementary Cryptography  Concepts of encryption  Cryptanalysis  Symmetric (secret key) Encryption (DES & AES)(DES & AES)  Asymmetric (public.

Hill Cipher Developed by the mathematician Lester Hill in The encryption algorithm takes m successive plain text and substitute for them m cipher.

Section 2.1: Shift Ciphers and Modular Arithmetic Practice HW from Barr Textbook (not to hand in) p.66 # 1, 2, 3-6, 9-12, 13, 15.

ITMS – 3153 Information Systems Security

NUMBER THEORY Chapter 5: Cryptology. Era of Electronic Electronic communication Electronic Banking.

Rather than just shifting the alphabet Could shuffle (jumble) the letters arbitrarily Each plaintext letter maps to a different random cipher text letter.

Symmetric-Key Cryptography

Announcements: Please pass in Assignment 1 now. Please pass in Assignment 1 now. Assignment 2 posted (when due?) Assignment 2 posted (when due?)Questions?

CSCI 5857: Encoding and Encryption

Cryptography Lecture 2: Classic Ciphers Piotr Faliszewski.

Classical Encryption techniques

© G. Dhillon, IS Department Virginia Commonwealth University Principles of IS Security Cryptography and Technical IS Security.

Elementary Cryptography  Concepts of encryption  Symmetric (secret key) Encryption (DES & AES)(DES & AES)  Asymmetric (public key) Encryption (RSA)(RSA)

Cryptograpy By Roya Furmuly W C I H D F O P S L 7.

Section 2.5: Polyalphabetic Substitutions Practice HW (not to hand in) From the Barr Text p. 118 # 1-6.

Introduction to Computer Security ©2004 Matt Bishop Information Security Principles Assistant Professor Dr. Sana’a Wafa Al-Sayegh 1 st Semester

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Security.

8.6. Knapsack Ciphers. The Concept At the core of the Knapsack cipher is the Knapsack problem: At the core of the Knapsack cipher is the Knapsack problem:

Traditional Symmetric-Key Ciphers

September 10, 2009Introduction to Computer Security ©2004 Matt Bishop Slide #8-1 Chapter 8: Basic Cryptography Classical Cryptography Public Key Cryptography.

Vigenere Cipher For example, choose a word “GOLD” for a key. And, add “GOLDGOLDGOLD….” to your plaintext Plaintext: t o o m u c h h y p e Key : GOLDGOLDGOLD.

24-Nov-15Security Cryptography Cryptography is the science and art of transforming messages to make them secure and immune to attacks. It involves plaintext,

Section 2.5 Polyaphabetic Substitutions

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Security PART VII.

Section 2.3: Substitution Ciphers

Encryption CS110: Computer Science and the Internet.

Introduction to Cryptography Lecture 8. Polyalphabetic Substitutions Definition: Let be different substitution ciphers. Then to encrypt the message apply.

Vigenére Cipher Kimberly Chiffens & Maria Jannelli.

Lecture 4 DECIPHERING CLASSICAL CIPHER SYSTEMS By: NOOR DHIA AL- SHAKARCHY

Introduction to Cryptography Lecture 4. Caesar Cipher Gaius Julius Caesar (100 B.C.- 44 B.C.) General Politician Dictator of Rome Creator of Caesar Cipher.

Substitution Ciphers Reference –Matt Bishop, Computer Security, Addison Wesley, 2003.

LAB#3 CLASSICAL ENCRYPTION CPIT 425. This diagram is taken from Dr.Omaima slides.

Cesar & Vigenere Encryption

Practical Questions Theoretical Questions

Asad Gondal Ali Haider Mansoor

By: Mohsin Tahir waqas Akram Numan-Ul-Haq Ali Asghar Rao Arslan

Symmetric Algorithm of Cryptography

Section 2.7 The Friedman and Kasiski Tests

CAP Cryptographic Analysis Program

History and Background Part 4: Transposition Ciphers

Computer and Data Security 4th Class

Information and Computer Security CPIS 312 Lab 2

History and Background Part 3: Polyalphabetic Ciphers

Computer and Data Security 4th Class

Taehyung Kim HPC Lab. POSTECH

Transposition Ciphers

ICS 454: Principles of Cryptography

Classical Polyalphabetic Ciphers

Kasiski Method Reference

Cryptanalysis of Vigenere Cipher

Block Ciphers: DES and AES

Cryptography and Cryptanalysis

Running Key Cipher The security of polyalphabetic substitution cipher reside in key length. In running-key cipher, the length of key must be equal the.

Florida State University

ICS 555: Block Ciphers & DES Sultan Almuhammadi.

Information and Computer Security CPIS 312 Lab 3

Presentation transcript:

Vigenère Tableau Reference –Matt Bishop, Computer Security, Addison Wesley, 2003.

Vigenère Tableau The Vigenère tableau is an example of an efficient implementation of the Vigenère cipher. An equivalent algorithm would be –Ci = (Mi + Ki) mod 26 –Where Ci,Mi, and Ki are all integers from 0,..,25, and i is an index for the ciphertext sequence and the key sequence.

Vigenère Tableau (p.2) An equivalent table is made up of A-Z as the first row, a shift of 1 letter for the second row, and so on. The columns and rows are labeled A-Z, and represent the plaintext and key character. The ciphertext is found by indexing into the table.

Vigenère Tableau (p.3)