Data processing apparatus and method for encryption or...

Details Data processing apparatus and method for encryption or... Data processing apparatus and method for encryption or...

2005-10-25

2005-10-25

Sheikh, Ayaz (Department: 2131)

Cryptography

Video cryptography

Video electric signal modification

C713S176000, C380S217000, C380S258000, C380S054000, C382S192000, C382S209000, C382S232000

Reexamination Certificate

active

06959088

ABSTRACT:
In order to shorten the time required for encryption and decryption of communication data, the contents of input data are analyzed by a discrimination method such as pattern matching, and in accordance with this analysis result, it is checked whether the received data is particular data. A portion of data judged as the particular data is encrypted and sent to an output buffer, whereas a portion other than the particular portion is not encrypted but is directly sent to the output buffer. Thereafter, the contents in the output buffer are transmitted. The particular data includes a control code of print data, upper bits of image data, predetermined discrete bits of voice data, a conversion tale for compression data, and the like.

REFERENCES:
patent: 5412730 (1995-05-01), Jones
patent: 5764770 (1998-06-01), Schipper et al.
patent: 5805700 (1998-09-01), Nardone et al.
patent: 6314188 (2001-11-01), Ishibashi

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