Читать книгу Cryptography, Information Theory, and Error-Correction - Aiden A. Bruen - Страница 40

1 1 United States National Security Agency.

2 2 Britain's Communications Electronics Security Group.

3 3 di meaning two, graph meaning character or symbol.

4 4 A poly‐alphabetic cipher uses several substitution alphabets instead of one.

5 5 Published as Federal Information Processing Standard (FIPS) standard 197.