1. Kerchoff's Principle states that the security of a cryptographic algorithm must not depend on the secrecy of the algorithm. 2. Message authentication proves the legitimacy of the message between sender and receiver while non-repudiation proves the messages origin as an indisputable fact. 3. Key space is $2^{80} = 1.21 * 10^{24}$ 4. 256 bit key length is generally considered safe even with quantum computers 5. A brute force attack is a trial and error method to exhaustively search the entire key space to guess the key and crack the CipherText.![[quiz1.pdf]][[ECE 646 Homework 1]]