Transcript
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
Thank You
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