Information Security
Aboul Ella Hassanien,
Cairo University, Faculty of Computer
and Information, IT Department
[email protected]
http:/www.softcomputing.net/~abo
Part-0
Big Image
Definitions
Compu
Computer Graphics Course Notes
2D Transformations
Transformation of objects aims to change the position, orientation and shape of the object.
Transformation may be constant, linear or non-linear. In c
Computer Graphics Course Notes
Circle drawing algorithms
) and radius R, we want to draw an approximation of the
Given the circle center point (
circle. Different methods are based on one of circle eq
Computer Graphics Course Notes
Clipping Algorithms
Real world objects can be represented relative to a reference world coordinate system. It is difficult
to view all the objects on computer screen at
Computer Graphics Course Notes
Line Drawing algorithms
Given the endpoints (x1, y1) and (x2, y2), we want to draw an approximation of the line
connecting (x1, y1) to (x2, y2)
[1] Direct (Nave) method
Computer Graphics Course Notes
Drawing Parametric Curves and Splines
Parametric curves are defined as vector functions of some scalar parameter t running from 0 to 1.
Mathematically, a point (x, y) on
Computer Graphics Course Notes
3D Vector Space
A vector represents a physical quantity that has magnitude and direction. A scalar has a magnitude
only. The following figure shows a vector . The vector
Cairo University
Faculty of computers and information
First year (2013-2014)
Electronics-I
Sheet 6
Midterm Revision
1- Given the numerical values of the currents and the voltages across all elements i
Cairo University
Faculty of computers and information
First year (2014-2015)
Electronics-I
Sheet 9
Maximum Power Theorem Y &
1- For the following circuit:
a. Find the value of RL that maximizes the p
Cairo University
Faculty of computers and information
First year (2013-2014)
Electronics-I
Sheet 8
Superposition
1- Use the principle of superposition to calculate the current io.
2- Use the principle
Cairo University
Faculty of computers and information
First year (2014-2015)
Electronics-I
Sheet 8
Norton & Thevenin
1- Find the Thevenin/Norton equivalent circuit with respect to the terminals a,b.
2
Cryptography and
Network Security
Chapter 3
Fourth Edition
by William Stallings
Lecture slides by Lawrie Brown
Modern Block Ciphers
now
look at modern block ciphers
one of the most widely used types
Cryptography and
Network Security
Chapter 4
Fourth Edition
by William Stallings
Lecture slides by Lawrie Brown
Chapter 4 Finite Fields
The next morning at daybreak, Star flew indoors,
seemingly keen f
Cryptography and
Network Security
Chapter 1
Fourth Edition
by William Stallings
Lecture slides by Lawrie Brown
Chapter 1 Introduction
The art of war teaches us to rely not on the
likelihood of the ene
The Secure Hill Cipher
Jeff Overbey
MA464-01 Dr. Jerzy Wojdyo April 29, 2003
Based on
S. Saeednia. How to Make the Hill Cipher Secure.
Cryptologia 24 (2000) 353360.
The Scenario
The Scenario
Alice
The
A Survey on Symmetric and Asymmetric
Encryption Models and Algorithms
1
Agenda
I: Facets of Data Security and Basic Terminology
II: Taxonomy of Cryptographic Systems
Substitution, Transposition, Prod
English Letter Frequencies
Playfair Key Matrix
a
5X5 matrix of letters based on a keyword
fill in letters of keyword (sans duplicates)
fill rest of matrix with other letters
eg. using the keyword M
Computer Graphics Course Notes
Filing Algorithms
Filling closed shapes means coloring the interior area of the shape. This requires algorithms to
compute all the interior shape points using the shape