Information processing method, decrypting method,...

Cryptography – Particular algorithmic function encoding

Reexamination Certificate

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C380S030000, C707S793000

Reexamination Certificate

active

07340054

ABSTRACT:
An information processing method, decrypting method, information processing apparatus, and computer program are provided. An information processing method generates a hierarchical tree used to provide a ciphertext decryptable only by a specific selected device through broadcast encryption. The method includes the steps of generating a unidirectional hierarchical tree including nodes having respective node associated values, the node associated value of each of the nodes being calculatable by a function using the node associated value and a node attached variable of at least one lower node; setting an intermediate label allowing calculation of values of labels associated with a special subset selected from labels of subsets defined based on a subset difference method; generating labels of the special subset by a calculation based on the intermediate label, and generating labels not associated with the special subset by a calculation based on the labels generated; and determining labels to be provided to a receiver associated with a terminal node of the hierarchical tree.

REFERENCES:
patent: 2003-145653 (2003-05-01), None
Halevy et al., “The LSD Broadcast Encryption Scheme,” Advances in Cryptography-Crypto 2002, Lecture Notes in Computer Science 24421, Sprinter, 2002, pp. 47-60.
Naor et al., “Revocation and Tracing Schemes for Stateless Receivers,” Advances in Cryptography-Crypto 2001, Lecture Notes in Computer Science 2139, Springer, 2001, pp. 41-62.
Ogata et al., “Efficient Tree Based Key Management Based on RSA Funciton,” Proceedings of the Symposium on Cryptography and Information Security, 2004, pp. 195-199.
Ogata et al., “Efficient Tree Based Key Management Based on RSA Function,” The 2004 Sympoalum on Cryptography and Information Security, 2004.
Nojima et al., “Efficient Tree-based Key Management Using One-way Functions,” The 2004 Sympoalum on Cryptography and Information Security, 2004.
Halevy et al., “The LSD Broadcast Encryption Scheme,” CRYPTO 2002, pp. 47-60, 2002.
Naor et al., “Revocation and Tracing Schemes for Stateless Receivers,” CRYPTO 2001, pp. 41-62, 2001.

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