Safety management method and apparatus for layering cipher key, and enciphering/deciphering device

Abstract

The invention provides a method and a device for the security management of a layered key, and an encryption-decryption device. The method comprises the following steps: generating a local encrypted layered key cryptograph according to the layered key generation request sent by a key management unit, and transmitting the local encrypted layered key cryptograph to the key management unit to be stored. The method and the device for the security management of the layered key, and the encryption-decryption device provided by the embodiment of the invention make up the defect of a universal encryption device and an external key management system thereof on the method for the security management of the layered key, and ensure that the key does not appear in a plaintext at any time outside the universal encryption device.

Description

A Hierarchical Key Security Management Method, Device, and Encryption and Decryption Device technical field The invention relates to a hierarchical key in a conditional access system in the field of digital television, in particular to a method, device and encryption and decryption device for the security management of a hierarchical key. Background technique In order to achieve the purpose of secure storage, keys are increasingly used in various fields, and hierarchical keys are one of the representatives. Hierarchical key refers to that under the multi-layer key system, the key used for content encryption is the bottom key, and the keys of other levels are used to encrypt the key of the next layer, and the top key The key is the core of the whole key system. Because the most used bottom key is often replaced, and the high-level key is used less, it makes it more difficult for the decipherer. Because this multi-layer key system greatly strengthens the encryption system T...

AI Technical Summary

Problems solved by technology

The main purpose of the embodiment of the present invention is to provide a hierarchical key security management method, device and encryption and decryption device to solve the problem that the plaintext of the hierarchical key may be leaked outside the general encryption machine

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