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)

Child Classifications

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• G09C 1/02 by using a ciphering code in chart form IPC+CPC Available in IPC and CPC
• G09C 1/04 with sign carriers or indicators moved relative to one another to positions determined by a permutation code, or key, so as to indicate the appropriate corresponding clear or ciphered text IPC+CPC Available in IPC and CPC
• G09C 1/06 wherein elements corresponding to the signs making up the clear text are operatively connected with elements corresponding to the signs making up the ciphered text, the connections, during operation of the apparatus, being automatically and continuously permuted by a coding or key member IPC+CPC Available in IPC and CPC