Symmetric Cryptography

Symmetric Cryptography is open!

Symmetric cryptography uses a shared secret key to protect the message confidentiality. Unauthorized attackers can't retrieve it. This course explains substitution and transposition, which are the foundations of classical cryptography. Then, we build on product ciphers (using both substitution and transposition/permutation) to describe modern block ciphers and review the widely used cipher algorithms in DES, 3-DES, and AES. We also allow block ciphers that support variable data lengths by introducing new block cipher operations in ECB and CBC, CFB and OFB modes.

This course can be taken in both the Applied Cryptography and Introduction to Applied Cryptography specializations.