Students: BSc in Computer Engineering, BSc in MIS, BSc in Computer Communications Eng
Course Code: CIS326
Reference:
Cryptography and Network Security, 4th Ed., William Stallings, Prentice Hall, ISBN 978-0-13-187316-2e
Assignment #1
MidTerm Review Question Sheet
Lectures:
1. Lecture 1 Course Description
2. Lecture 2 Introduction
3. Lecture 3 Classical Encryption Techniques
4. Lecture 4 Block Ciphers
5. Lecture 5 Data Encryption Standard
6. Lecture 6 Block Cipher Design Principles
7. Lecture 7 Encryption Examples
Introduction to Number Theory (By Lawrie Brown).
8. Lecture 8 Assymetric Public Key Cryptography
9. Lecture 9 RSA
10. Lecture 10 Public-Key Cryptography Examples
Students: MSc in CIS
Course Code: GCIS521
References:
1. Internet Security 2003
Man Young Rhee
ISBN 0-470-85285-2
2. Cryptography and Network Security
William Stallings, Prentice Hall
ISBN 978-0-13-187316-2e
Course Resources:
1. Lecture 1 Course Description
2. Lecture 2 Review of Networking Principles
3. Lecture 3 Block Cipher Principles
4. Lecture 4 Data Encryption Standard
5. Lecture 5 Hash Functions, MDs, and MACs
Introduction to Numbers Theory (by Lawrie Brown)
6. Lecture 6 Assymetric Public-Key Cryptosystems
7. Lecture 7 RSA
8. Lecture 8 Network Layer Security (Part one)
9. Lecture 9 Network Layer Security (Part two)
10. Lecture 10 Network Traffic Filtering.
ABSTRACT
The Data Encryption Standard (DES) has shown noticeable signs of aging during the last two decades. In this paper we develop a system that is a DES-variant with more resistance towards the possible attacks against DES. The developed system has a sub-key generation algorithm that is completely different from the original DES.
The developed system uses 84-bit initial key instead of the 56-bit key originally used. It has substitution boxes inside the key generation algorithm and mod2 additions. The choice of arrangement of substitution boxes in the main algorithm for each round is sub-key dependent. The result of the design is a DES-variant cryptographic system that has higher resistance against brute-force attack, differential cryptanalysis, and linear cryptanalysis. The proposed system design also cancelled the weak-keys and complement keys properties of the DES.
Index Terms – data encryption standard, encryption, cryptanalysis.
Citation Information:
Mohammed M. Alani, DES96 – Improved DES Security, Proceedings of the 7th IEEE International Multi-Conference on Systems, Signals and Devices (SSD'10) , Amman, Jordan. June 2010. (IEEEXplore).
ABSTRACT
The Data Encryption Standard (DES) has shown noticeable weaknesses during the last decade. In this paper we develop a system that is a DES-variant but has more resistance towards the latest attacks against DES. The developed system has a sub-key generation algorithm that is totally different from the original DES one. The developed system uses a 70-bit initial key instead of the 56-bit key originally used. It has substitution boxes inside the key generation algorithm and mod2 addition. The choice of arrangement of substitution boxes in the main algorithm for each round is sub-key dependent. The result of our design is a DES-variant cryptographic system that has higher resistance towards brute-force attack, differential cryptanalysis, and linear cryptanalysis. Our design also canceled the weak-keys and complement-keys properties of the DES.
Citation Information:
Abdul-Karim A-R. Kadhim, Mohammed M. Alani, DES80: A DES-Variant Cryptographic System, published in the First Scientific Conference of the State Company of Internet Services, Baghdad, Oct. 22nd -23rd , 2002.
Note: By the time we were working on this paper in the years 2000-2001, we had very limited Internet connectivity in Iraq. This lead to the fact that we did not know about the Canadian DES80 project at all. If we knew, we would have changed the name of the paper accordingly.
Students: Computer Engineering Semester 8
References:
Applied Cryptography: Protocols, Algorithms, and Source Code, by Bruce Schneier
