In those papers, we exploited separately the security of evolutionary block cipher against multidimensional linear cryptanalysis and differential cryptanalysis.

But generally, complex ciphers involving AES, RSA, or stream and block can be made very strong and secure. Then, of course, there is QKD, the granddaddy of all unbreakable ciphers.

Others use the stream method, which encrypts one bit at a time. See mode of operation, cryptography, security protocol, stream cipher, block cipher and algorithm.

Bytes of plaintext go into the stream cipher, and bytes of encrypted text come out the other end. RC4 is an example of a stream cipher (see RC4). Contrast with block cipher.

Zero-correlation linear cryptanalysis is an important method to analyze the security of block ciphers. But there are few works on zero-correlation linear attacks combined with the related-key setting.

The National Security Agency (NSA) is offering two families of encryption algorithms, known as block ciphers, intended to provide a level of security for such processes as authentication or ...

Topics include symmetric and public-key encryption, message integrity, hash functions, block-cipher design and analysis, number theory, and digital signatures. Overview This course is an undergraduate ...

Topics include symmetric and public-key encryption, message integrity, hash functions, block-cipher design and analysis, number theory, and digital signatures. Overview This course is an undergraduate ...