×Key Distribution : Negotiation ×Key Management : N*(N-1)/2.

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Presentation transcript:

×Key Distribution : Negotiation ×Key Management : N*(N-1)/2

In 1978, Knapsack System, a public key cryptosystem, was raised by Merkle and Hellman based on its intractability

In 1978, RSA System, a public key cryptosystem, was raised by Rivest, Shamire and Adleman based on Decomposition of BigNumber and Detection of Primes

Why must we need authentication ?

Attack to Information Security : Passive Attack : Cut-Out & Analysis Active Attack : Forge, Resend, Distort, Reject Denial : deny the info sender sends

Defense : Passive Attack : Encryption Active Attack, Denial : Digital Signature

Reliability Unforgeability Nonduplication Unchangeability Nonrepudiation

Hash Encryption (RSA)Decryption (RSA) AU TH EN TIC ATI ON