Alice and Bob use a modified Caesar cipher to authenticate each other. Instead of letters, they use numbers from 0 to 49
Posted: Mon Jul 11, 2022 9:53 am
Alice and Bob use a modified Caesar cipher to authenticate each other. Instead of letters, they use numbers from 0 to 49. Alice authenticates Bob by sending him a challenge, which is a random number, 25. Bob encrypts the challenge with a key and replies to Alice with number 5. What is the key?