CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY

Introduced: September 1968

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).

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

3 shared codes have differing titles between IPC and CPC.

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 (cryptographic typewriters G09C3/00) IPC+CPC Available in IPC and CPC
G09C 3/00 Typewriters for ciphering or deciphering cryptographic text (marking record carriers G06K) IPC+CPC Available in IPC and CPC
G09C 5/00 Ciphering apparatus or methods not provided for in the preceding groups, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages IPC+CPC Available in IPC and CPC