G09C - Ciphering or deciphering apparatus for cryptographic or other purposes involving the need for secrecy

More topics under "G09C - Ciphering or deciphering apparatus for cryptographic or other purposes involving the need for secrecy" (15,760)
G09C 1 - 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 (12,544)
G09C 3 - Typewriters for ciphering or deciphering cryptographic text (479)
G09C 5 - 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 (2,737)

Patents for G09C - Ciphering or deciphering apparatus for cryptographic or other purposes involving the need for secrecy (12)
02/2009
02/26/2009	US20090052655 Method for Encryption and Decryption
10/2007
10/17/2007	CN101057433A Storing of metadata
08/2006
08/10/2006	WO2006083179A1 Method for encryption and decryption
01/2006
01/19/2006	WO2006006931A1 Storing of metadata
09/2004
09/08/2004	CN1165881C Display apparatus
01/2003
01/23/2003	WO2003007252A1 Method for generation of authentication information and use thereof
11/2001
11/27/2001	US6323752 Electronic instrument having resettable security code and method for resetting security code
11/2000
11/07/2000	CA2086430C System for the secure storage and transmission of data
05/1998
05/20/1998	CN1182256A Display apparatus
06/1993
06/02/1993	EP0543893A1 System for the secure storage and transmission of data
01/1992
01/04/1992	WO1992001278A1 System for the secure storage and transmission of data
06/1991
06/25/1991	US5027401 System for the secure storage and transmission of data