Notes: Intro to Crypto

Crypto 839: Intro to Notes C1-2

How do Alice/Bob communicate without Eve eavesdropping? Agree on a secret key Ke and have to do this through the same chan When Alice wants to send a msg: 1. Encrypts its using function E(Ke, m) then calls result of cipher text c 2. Alice sends ciphertext c=

Crypto 839: Personal Notes C1

> "A security system is only as strong as its weakest link" Attack Tree: Organizing a tree in a way to see/monitor weakest points. - Insight to possible lines of attack - Always part of a larger tree Weakest link property: Strengthening anything but weakest link can