MPEGパケットを暗号化する装置及び方法

Japanese Patent JP3626502

B2

A method of encrypting clear payload data to form encrypted payload data uses a block cipher, the block cipher being characterized by a predetermined block length. The method includes a step of parsing and first and second steps of encrypting. The step of parsing parses the clear payload data into at least one full clear block and a residual block, the at least one full clear block including a last full clear block. Each full clear block is characterized by the predetermined block length. The residual block is characterized by a residual block length, the residual block length being less than the predetermined block length. The step of parsing further parses the last full clear block into a first part and a second part, the second part being characterized by a length equaling a difference between the predetermined block length and the residual block length. The first step of encrypting encrypts a combination of the second part and the residual block to form a first encrypted block, the first encrypted block having a third part and a fourth part. The third part is characterized by a length equaling the second part length. The second step of encrypting encrypts a combination of the first part and the third part to form a second encrypted block, and it is the combination of the second encrypted block and the fourth part that forms the encrypted payload data.

Howard George, Pinder
Pargon, Michael Stephen

JP51905297A

March 09, 2005

November 14, 1996

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SCIENTIFIC-ATLANTA INCORPORATED

G09C1/00; H04L9/06; H04L9/14; H04N7/167; (IPC1-7): H04L9/14; G09C1/00

JP6138820A
JP4035432A
JP63287882A

MEYER ET AL, Cryptography:A New Dimension in Computer Data Security ,米国,New YorK: John Wiley & Sone, 1982年,p.73-85

Kazuo Shamoto
Shosuke Imai
Tadashi Masui
Tadahiko Kurita
Yasushi Kobayashi
Hideo Tanaka

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