System and method for processing information using encryption key block

Abstract

In the key tree that uses multiple devices as the root of the tree, nodes and keys are associated with the keys on the leaves, set sub-trees that are distinguished by the data processing capabilities (capacities) of the devices, and the management subject of each sub-tree (Entity), an effective sub-effective key group is generated within the entity, and an effective key group that can only be decrypted by devices with common capabilities is generated in the key distribution center based on the capability information of the devices. In addition, manage the partial tree (subtree) of the key tree, generate a sub-activation key based only on the key set corresponding to the node or leaf belonging to the sub-tree, use the sub-effective key group, and generate The effective key group that can be decrypted in the selected entity can generate and distribute the effective key group according to the data processing capability of the device, and can divide and manage the key tree structure of the hierarchical structure.

Description

[0001] This application is a divisional application of: [0002] Invention title: "Information processing system and method using encryption key group" [0003] Application date: June 15, 2001 [0004] Application number: 01802411.4 (PCT / JP01 / 05146) technical field [0005] The present invention relates to an information processing system using an encryption key group, an information processing method, and a program providing medium, and particularly relates to a system and method for distributing cryptographic processing keys in a system accompanying cryptographic processing. In particular, to provide an information processing system using an encryption key group, an information processing method, and a program providing medium, which suppress the amount of messages to a small amount by using a tree-structured hierarchical key distribution method, For example, the load of data distribution at the time of content distribution or updating of various ke...

AI Technical Summary

Problems solved by technology

In the authentication method, there are mutual authentication using a common key encryption method, and an authentication method using a public key method. In the authentication using a common key, a common key is required for the entire system. In the update process Inconvenient to wait

In addition, in the public key method, the calculation load is large and the amount of memory required is also large, and it cannot be said that it is a desired configuration to install such a processing device in each device.

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