Decryption device

Details Decryption device Decryption device

2007-09-18

2007-09-18

Vu, Kim (Department: 2135)

Information security

Prevention of unauthorized use of data including prevention...

C726S027000, C726S029000, C380S201000

Reexamination Certificate

active

09829763

ABSTRACT:
A decryption device includes: an internal-key storage section for storing an internal-key; a content-key storage section for storing a content-key; a determination section for determining whether or not a value of the content-key storage section in its initial state and a current value of the content-key storage section are different; and an operation section, the operation section including a first decrypting section which, when an encrypted content-key is input to the operation section, decrypts the encrypted content-key using the internal-key so as to obtain a content-key and stores the content-key in the content-key storage section, and a second decrypting section which, when an encrypted content is input to the operation section and the determination section determines that the value of the content-key storage section in its initial state and the current value of the content-key storage section are different, decrypts the encrypted content using the current value of the content-key storage section as a content-key so as to obtain a first output data and outputs the first output data to outside of the decryption device.

REFERENCES:
patent: 5452357 (1995-09-01), Naccache
patent: 5923754 (1999-07-01), Angelo et al.
patent: 6009174 (1999-12-01), Tatebayashi et al.
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patent: 6496928 (2002-12-01), Deo et al.
patent: 6801999 (2004-10-01), Venkatesan et al.
patent: 2002/0016919 (2002-02-01), Sims, III
patent: 07-131449 (1995-05-01), None
“Copy Protection for DVD Video”, Bloom, et al., Proceedings of the IEEE, vol. 87, No. 7, Jul. 1999, pp. 1267-1276.

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