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Elementry Cryptography
1. School of Computer Science & Information Technology Presentation On Elementary Cryptography Presented by: Anshul Jain (NM) Sumit Lole (CS) M.Tech. II sem Guided by: Dr. D.S. Bhilare
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13. Comparison Secret Key (Symmetric) Public Key (Asymmetric) Number of Key 1 2 Protection of Key Must be kept secret One key must be kept secret 7 other can be freely exposed Best Uses Cryptographic workhorse; secrecy and integrity of data, single characters to blocks of data, messages, files Key exchange, authentication Key Distribution Must be out-of-band Public key can be used to distribute other keys Speed Fast Slow; typically, 10,000 times slower than secret key
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19. Comparison between DES & AES DES AES Date 1976 1997 Block Size 64 bits 128 bits Key Length 56 bits(effective length) 128, 192, 256 ( possibly more) bits Encryption Primitive Substitution, permutation Substitution, shift, bit mixing Cryptographic Primitive Open Open Design Close Open Selection Process Secret Secret, but accepted open public comment
28. Digital Signature A digital signature is a protocol that produces the same effect as a real signature: It is a mark that only the sender can make, but other people can easily recognize as belonging to the sender. Just like a real signature, a digital signature is used to confirm agreement to a message.