IP Library › Granted Patent US 7,254,234
Granted Patent B2
US 7,254,234 · App. 10/227,460 · Granted Aug 7, 2007

Method and apparatus for encrypting and decrypting information

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Quick Facts
Patent No.
US 7,254,234
App. No.
10/227,460
Granted
Aug 7, 2007
Kind
B2
Abstract

An encryption key is generated in response to a plurality of information pieces being bases for the encryption key. Original information is encrypted into encryption-resultant information in response to the generated encryption key. The encryption-resultant information is divided into units. Each of the units is loaded with encryption control information for identifying the plurality of information pieces being the bases for the encryption key.

Claims (12)

1. A method of encrypting plain text information with an encryption key, the plain text information including digital contents, the method comprising the steps of:

dividing the plain text information into units each corresponding to every prescribed number of successive packets conforming to the MPEG standards;

generating an encryption key from information pieces appointed for each of the units composing the plain text information;

encrypting each of the units composing the plain text information in response to the corresponding generated encryption key to generate a unit of encryption-resultant information;

generating encryption control information for appointing the information pieces used in generating the encryption key for each of the units composing the plain text information; and

adding, to each of the units of the encryption-resultant information, the corresponding generated encryption control information.

2. An apparatus for encrypting plain text information with an encryption key, the plain text information including digital contents, the apparatus comprising:

means for dividing the plain text information into units each corresponding to every prescribed number of successive packets conforming to the MPEG standards;

means for generating an encryption key from information pieces appointed for each of the units composing the plain text information;

means for encrypting each of the units composing the plain text information in response to the corresponding generated encryption key to generate a unit of encryption-resultant information;

means for generating encryption control information for appointing the information pieces used in generating the encryption key for each of the units composing the plain text information; and

means for adding, to each of the units of the encryption-resultant information, the corresponding generated encryption control information.

Assignments (2)
MERGER Recorded Apr 9, 2012
From: VICTOR COMPANY OF JAPAN, LTD.
To: JVC KENWOOD CORPORATION
Reel/Frame 028010/0740 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 26, 2002
From: SUGAHARA, TAKAYUKI; INOHA, WATARU; HIGURASHI, SEIJI; KUROIWA, TOSHIO; UEDA, KENJIRO
To: VICTOR COMPANY OF JAPAN, LTD.
Reel/Frame 013229/0886 →