Cryptographic circuit and method therefor

Abstract

Data security is facilitated. In accordance with one or more embodiments, a target circuit is used to generate encryption information specific to the target circuit. The encryption information is used for generating data corresponding to a key, such as for decrypting media content. In some implementations, encryption information is used together with key data to generate a key offset. The key offset is subsequently used, together with newly-generated encryption information, to obtain the key.

Description

technical field [0001] The invention relates to a cryptographic circuit and its method. Background technique [0002] Many media content systems employ encryption or other methods to protect media content. In many applications, content delivery is based on a subscription-based service. For example, subscription-based media systems, such as pay television systems, typically encrypt analog or digital media signals to be provided to users. Encrypted content can be accessed using a key hierarchy primarily determined by the end product architecture. [0003] Decryption is typically performed using a decoder box that uses a removable smart card to provide "renewability" of the conditional access system (i.e., if the system is compromised, it can be replaced by an operator simply by changing the smart card to change the encryption algorithm and other information without having to change the decoder box). Due to this architecture, and the generally insecure architecture of many ...

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Problems solved by technology

Although several methods have been implemented to alleviate this distribution burden, challenges still arise

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