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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 =
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.
CAP Cryptographic Analysis Program Column Transposition Cipher Help Presentation Press Enter or click on your mouse button to continue.
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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)
Time for a BREAK! You have 45 Minutes. Time Left 44.
Section 2.5: Polyalphabetic Substitutions Practice HW (not to hand in) From the Barr Text p. 118 # 1-6.
Problem Set 1 15.If r is the rank and d is the determinant of the matrix what is r-d? Megan Grywalski.
SADI EVREN SEKER MACROECONOMIC ICT FACTS AND MOBILE TELECOM OPERATORS VIA SOCIAL NETWORKS AND WEB PAGES.
3.6 Solving Systems of Linear Equations in 3 Variables p. 177.
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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.
DES is a block cipher, as shown in Figure Overview Figure 6.1 Encryption and decryption with DES.
C Copyright © 2005, Oracle. All rights reserved. Practice Solutions.
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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Petersons Practice AP Exam Cengage Learning Infotrack Database.
CAP Cryptographic Analysis Program Homophonic Cipher Help Presentation Press Enter or click on your mouse button to continue.
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.
BMU - E I 1 Development of renewable energy sources in Germany in
How to create Magic Squares Diana Gonzalez Lauren Nation Kristy Ochoa Cindy Santiago By PresenterMedia.comPresenterMedia.com Let’s make some magic!
Matrix Multiplication The Introduction. Look at the matrix sizes.
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.
CAP Cryptographic Analysis Program ADFGVX Help Presentation Press Enter or click on your mouse button to continue.
Introduction to Computer Security ©2004 Matt Bishop Information Security Principles Assistant Professor Dr. Sana’a Wafa Al-Sayegh 1 st Semester
1 Prof. Valter Bezerra Dantas
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§9-3 Matrix Operations. Matrix Notation The matrix has 2 rows and 3 columns.
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1 Symmetric key cryptography: DES DES: Data Encryption Standard US encryption standard [NIST 1993] 56-bit symmetric key, 64 bit plaintext input How secure.
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