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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 subclass/group 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 relevant to classification in this subclass
This subclass/group does not cover:

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

Cryptographic mechanisms or cryptographic arrangements for secret or secure communication
Secret communication for (analogue) speech signals
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 subclass/group covers:

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

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 subclass/group 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.

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 words "ciphering" and "encryption" are often used as synonyms.

In patent documents the words "concealment", "masking", "obfuscation", "obscuring", "hidden". "deformation" and "altering" are often used as synonyms.

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013