DES

Data Encryption Standard - DES

DES was developed as a standard for communications and data protection by an IBM research team, in response to a public request for proposals by the NBS - the National Bureau of

Standards (which is now known as NIST).

By:T.N.Srimanyu (12MCMB06)Ritika Singla (12MCMB15)M.Tech(IT)

DES - Basics DES uses the two basic techniques of cryptography -

confusion and diffusion. At the simplest level, diffusion is achieved through

numerous permutations and confusion is achieved through the XOR operation.

DES - The 16 Rounds The basic process in

enciphering a 64-bit data block and a 56-bit key using the DES consists of: An initial permutation (IP)

16 rounds of a complex key dependent calculation f

A final permutation, being the inverse of IP

Triple DES - More Secure

IMPROVED DES ALGORITHM BASED ON IRRATIONAL

NUMBERS

IEEE Int. Conference Neural Networks & Signal Processing

Zhenjiang, China, June 8~10, 2008

Irrational Numbers

Irrational numbers, which are similar to data sequences generated form chaotic system, are infinite and

non-cyclic.Therefore using irrational numbers to encrypt will provide

higher security without strict chaos synchronization.

Advantages The improved scheme prevents the key from being

directly involved in the production of sub-keys.It can increase the randomness of the production of the

sub-keys and use different sub-keys each group.The key space is extended.

ConclusionThis paper designs an encryption algorithm with better

security, bigger secret-key space and higher encrypting efficiency.

This scheme can expand the key space without any more running time and enhance the security of the encryption algorithm.

The algorithm has wider foreground applications based on these advantages.

Bibliographywww.ieeexplore.com

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