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  1. 1. Data Encryption Standard - DESDES 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)
  2. 2. 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.
  3. 3. 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
  4. 4. Triple DES - More Secure
  5. 5. IMPROVED DES ALGORITHM BASED ON IRRATIONAL NUMBERSIEEE Int. Conference Neural Networks & Signal ProcessingZhenjiang, China, June 8~10, 2008
  6. 6. 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.
  7. 7. 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.
  8. 8. ConclusionThis 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.
  9. 9. Bibliography
  10. 10. Thank You Any Queries?