초암호화
초암호화(Superencipherment, Multi Encryption)는 암호화 과정중 하나로, 암호화를 거친 암호문을 한번 혹은 여러번 치환이나 변환을 하는 것이다. 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.

참고 문헌

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 "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.

암호학