Pseudorandomness – Encryption and Decryption

4.5 Pseudorandomness Computational security is built on the concept of pseudorandomness, the idea that bit strings (that is, ciphertexts) can look completely random even though they are not. Pseudorandomness enables us to build (computationally) secure symmetric encryption schemes where a relatively short key, let’s say 128 bits long, is used to securely encrypt multiple terabytes…