Basic HTML version of Foils prepared
July 6 99
Foil 19 Public Key Cryptography (1)
From
Security Infrastructure fo Electronic Commerce and Internet CPS714 Computational Science Information Track --
June 2 and June 7 99
.
by
Roman Markowski
1
Symmetric Cryptography
adding Confidentiality; single key, shared secret
Standards: DES (Digital Encryption Standard) and IDEA (International Data Encryption Algorithm)
fast, easy to implement, reliable
problem: key exchange in un-trusted networks
2
Secret key, Secure channel
3
Cleartext
4
message
5
Cleartext
6
message
7
Encrypt
8
Decrypt
in Table To:
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