G09C CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
Introduced: September 1968
Classification Context
- Section:
- PHYSICS
- Class:
- EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- Subclass:
- CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
Description
G09C covers mechanical, electromechanical, and electronic apparatus designed to encrypt, decrypt, or otherwise process information requiring confidentiality. This includes rotor-based cipher machines (such as Enigma-type devices), electromechanical encryption systems, and early electronic cryptographic equipment used for secure communication. The classification encompasses both the hardware apparatus itself and the functional mechanisms for generating, applying, or reversing cryptographic transformations. Related cryptographic algorithms, mathematical methods, or software-based encryption systems are typically classified elsewhere (e.g., H04L for digital encryption in telecommunications).
Scope Notes
Application references: Secret communication Arrangements for conditional access to broadcast information or to broadcast-related services using cryptography Secret digital communication
Related Keywords
3 direct subcodes
Child Classifications
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- G09C 1/00 Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system
- G09C 3/00 Typewriters for ciphering or deciphering cryptographic text
- G09C 5/00 Ciphering or deciphering apparatus or methods not provided for in other groups of this subclass, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages