This is a design criterion of modern ciphers; in other words, ciphers are considered broken if their output is discernible from random. Mihir Bellare, Phillip Rogaway (2005-09-20). "Chapter 3: Pseudorandom functions". Introduction to Modern Cryptography. p. 7. Archived from the original on 2007-10-11. Retrieved 2007-09-30.
This is a design criterion of modern ciphers; in other words, ciphers are considered broken if their output is discernible from random. Mihir Bellare, Phillip Rogaway (2005-09-20). "Chapter 3: Pseudorandom functions". Introduction to Modern Cryptography. p. 7. Archived from the original on 2007-10-11. Retrieved 2007-09-30.