B, S, hybrid block cipher method

Dissertant

Mahdi, Gaidaa Said

University

University of Technology

Faculty

-

Department

Computer Sciences Department

University Country

Iraq

Degree

Master

Degree Date

2004

English Abstract

Blowfish is a secret-key block cipher designed in 1994.

It is a Feistily network, iterating a simple encryption function 16 times.

The block size i:, 8-bytes and the key can be any length up to 256-bytes.

Serpent blot I- cipher algorithm was designed in 2000.

Serpent is a 32 round iterated block cipher with a 128-bit block size and uses 128, 192, and 256 : bits key length.

But the fact remains that the best Serpent software implementation will be 3-4 times slower than other candidates.

B-S, a new secret-key block cipher, is proposed.

It is a feistily network, iterating a simple encryption function 16 times.

The block size is 128 bits, and the key can be any length up to 256 bytes.

It is designed to take advantage of the powerful algorithm, which is supported by Blowfish and Serpent algorithms, .with overcoming their weaknesses, resulting in a much improved security/performance tradeoff over existing ciphers.

As a result the proposed algorithm offers better security than Blowfish and-Serpent algorithms.

The proposed algorithm is.

Compact, fast, simple and easy to understand.

It also uses large key compared with Blowfish and.

Serpent algorithms and this makes the algorithm infeasible to Brute force attack.

To meet the requirements of the AES, a block cipher must handle 128-bit input / output blocks, while Blowfish acts with 64-bits block size.

On the other hand, its large memory requirement makes it infeasible for smart card applications.

So the B-S algorithm increases the block size and reduces memory requirements to become suitable to hardware implementation.

Main Subjects

Information Technology and Computer Science

Topics

• Writing
• Encryption
• Symbolism
• Data

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305591