Cooperative Patent Classification

CPC Definition - Subclass G09C

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Last Updated Version: 2016.11
CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY (secret transmission H04K; arrangements for secret telegraphic communication H04L 9/00)
Definition statement

This place covers:

Apparatus or methods for ciphering or deciphering 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, e.g. replacing plain text by a scrambled sequence .

Typewriters specially adapted for ciphering or deciphering cryptographic text.

Other apparatus or methods for ciphering or deciphering, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages.

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Secret communication for (analogue) speech signals

Cryptographic mechanisms or cryptographic arrangements for secret or secure communication

Informative references

Attention is drawn to the following places, which may be of interest for search:

Holographic processes

Security arrangements for protecting computers against unauthorised activity

Marking record carries

Recognizing patterns or reading or recognizing printed or written characters

General purpose image data processing

Individual entry or exit registers

Testing paper currency

Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus

Information storage based on relative movement between record carrier and transducer

Coding, decoding or code conversion, in general

Secrecy systems for scanning, transmission or reproduction of documents

Typewriters for ciphering or deciphering cryptographic text (marking record carriers G06K)
Definition statement

This place covers:

Mechanical or electro-mechanical devices with keys whose operation realizes a transposal or replacement of signs or groups of signs

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Typewriters characterised by the purpose for which they are constructed

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
Definition statement

This place covers:

Techniques and devices for hidden messages or images such as passwords, personal identification codes.

Visual cryptography.

Ciphering techniques for securing printed messages or images.

Examples: US2009245512, US2010188709, US2005044395.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Changing, amusing, or secret pictures

Additional places which may be of interest for search are listed above for the subclass references.

Synonyms and Keywords

In patent documents, the following words/expressions are often used as synonyms:

  • "ciphering" and "encryption"
  • "concealment", "masking", "obfuscation", "obscuring", "hidden". "deformation" and "altering"