초암호화(Superencipherment, Multi Encryption)는 암호화 과정중 하나로, 암호화를 거친 암호문을 한번 혹은 여러번 치환이나 변환을 하는 것[1]이다. 초암호화를 하는 암호 알고리즘은 처음 암호문과 같은 암호 알고리즘일수도 있으며, 다른 암호 알고리즘일수도 있다. 이렇게 초암호화 단계에서 해독 된 것을 가리켜 플라코드(Placode), 초암호화에서 변형된 것을 엔시코드(encicode)라고 불린다.[1]
- "Multiple encryption" in "Ritter's Crypto Glossary and Dictionary of Technical Cryptography"
- Confidentiality through Multi-Encryption, in: Adams, David / Maier, Ann-Kathrin (2016): BIG SEVEN Study, open source crypto-messengers to be compared - or: Comprehensive Confidentiality Review & Audit of GoldBug, Encrypting E-Mail-Client & Secure Instant Messenger, Descriptions, tests and analysis reviews of 20 functions of the application GoldBug based on the essential fields and methods of evaluation of the 8 major international audit manuals for IT security investigations including 38 figures and 87 tables., URL: https://sf.net/projects/goldbug/files/bigseven-crypto-audit.pdf - English / German Language, Version 1.1, 305 pages, June 2016 (ISBN: DNB 110368003X - 2016B14779).
- A "way to combine multiple block algorithms" so that "a cryptanalyst must break both algorithms" in §15.8 of Applied Cryptography, Second Edition: Protocols, Algorithms, and Source Code in C by Bruce Schneier. Wiley Computer Publishing, John Wiley & Sons, Inc.
- S. Even and O. Goldreich, On the power of cascade ciphers, ACM Transactions on Computer Systems, vol. 3, pp. 108–116, 1985.
- M. Maurer and J. L. Massey, Cascade ciphers: The importance of being first, Journal of Cryptology, vol. 6, no. 1, pp. 55–61, 1993.
