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SE 441 INFORMATION SYSTEMS SECURITY Early Ciphers
Early Ciphers: Atbash Plaintext: MALTEPE Ciphertext: NZOGVKV
Early Ciphers: Pigpen Plaintext: sadi evren seker Ciphertext:
Early Ciphers: Vigenere
Plaintext: MALTEPE Key: HUSEYIN Ciphertext: TUDXCXR
Early Ciphers: Polybius m, 3th row and 2nd column –> 32 a, 1st row and 1st column –> 11 l, 3th row and 1st column –> 31 t, 4th row and 4th column –> 44 e, 1st row and 5th column –> 15 p, 3th row and 5th column –> 35 e, 1st row and 5th column –> 15 maltepe = 32113144153515
Vigenère Tableau Reference –Matt Bishop, Computer Security, Addison Wesley, 2003.
CS 483 – SD SECTION BY DR. DANIYAL ALGHAZZAWI (2) Information Security.
Multiplying matrices An animated example. (3 x 3)x (3 x 2)= (3 x 2) These must be the same, otherwise multiplication cannot be done Is multiplication.
Substitution Ciphers Reference –Matt Bishop, Computer Security, Addison Wesley, 2003.
Section 2.5 Polyaphabetic Substitutions The monalphabetic ciphers (e.g. shift, affine, substitution) are vulnerable to frequency analysis. To increase.
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Hybrid Cipher encryption Plain Text Key Cipher Text Key Plain Text IV Hybrid Cipher decryption Hybrid Cipher Note: IV used in encryption is not used in.
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TRIANGULAR MATRICES A square matrix in which all the entries above the main diagonal are zero is called lower triangular, and a square matrix in which.
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Bell Schedules Club Time is available from 8:05-8:20 1 st 8:20 – 9:15 2 nd 9:20 – 10:10 3 rd 10:15 – 11:05 4 th 11:10 – 12:50 A(11:10)
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SADI EVREN SEKER MACROECONOMIC ICT FACTS AND MOBILE TELECOM OPERATORS VIA SOCIAL NETWORKS AND WEB PAGES.
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CYPHER INDEX n Introduction n Background n Demo INTRODUCTION n Cypher is a software toolkit designed to aid in the decryption of standard (historical)
Copyright Tim Morris/St Stephen's School Area of a Rectangle This is one in a series of Powerpoint slideshows to illustrate how to calculate the area of.
6.1.2 Overview DES is a block cipher, as shown in Figure 6.1.
Symmetric Ciphers 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.
PSSA Preparation. Question 1(no calculator) D Question 2 (no calculator)
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McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Security PART VII.
An Introduction to Cryptography. What is cryptography? noun \krip- ˈ tä-grə-fē\ : the process of writing or reading secret messages or codes “Encryption”:
Exit a Customer Chapter 8. Exit a Customer 8-2 Objectives Perform exit summary process consisting of the following steps: Review service records Close.
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11.5 Recursive Rules for Sequences p Explicit Rule A function based on a term’s position, n, in a sequence. All the rules for the nth term that.
FOR GIVE what we give when we for give. FOR GIVE what we give when we for give We “Give” Ourselves… Freedom from anger, bitterness, and hated. (Eph 4:31-32;
CMSC 414 Computer (and Network) Security Lecture 3 Jonathan Katz.
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Introduction to Computer Security ©2004 Matt Bishop Information Security Principles Assistant Professor Dr. Sana’a Wafa Al-Sayegh 1 st Semester
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