Title: Key sharing system, shared key generating apparatus, and shared key restoring apparatus
Application Number: 200380100504 Application Date: 2003.11.28
Publication Number: 1692598 Publication Date: 2005.11.02
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04L9/08;G09C1/00
Applicant(s) Name: Matsushita Electric Ind Co., Ltd. Address:
Inventor(s) Name: Fuda Yuichi;Omori Motoji;Tatebayashi Makoto;Yamami
Attorney & Agent: liu zongjie ye kaidong
Abstract:
    There is provided a content distribution system which prevents introduction of different keys between an encryption device and a decryption device. The encryption device (110) has a random number generator (112) for generating a random number s and a first function section (113) for generating a function value G(s) of the random number s. From the function value G(s), a random number u and a shared key K are generated. An encryption section (114) generates a first encrypted text c1 of the random number s by using a public polynominal h and the random number u. The decryption device (120) has: a decryption section (123) for decrypting the first encrypted text c1 by using a secret key polynominal f and generating a decrypted random number s
Time: 7
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