Secure Channel Using Symmetric Key Cryptography

One way to acheive a Secure Channel is to make the assumption that Alice and Bob have a shared secret key. For example, through a Key Exchange.

We split the problem in two:

1. First, achieve authenticity:
   • M = MAC (Message Authentication Code)
   • V = Verify
   • Message Authentication Code
     • Hash-Based Message Authentication Code
2. Second, add confidentiality
   • E = Encrypt
   • D = Decrypt
   • Block Cipher
     • ECB
     • CBC
   • Stream Cipher

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Relevant Note(s):