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Crypto chip

A secure crypto processor is a dedicated computer on a chip or microprocessor for carrying out cryptographic operations, embedded in a packaging with multiple physical security measures, which give it a degree of tamper resistance. Unlike cryptographic processors that output decrypted data onto a bus in a secure environment, a secure cryptoprocessor does not output decrypted data or decrypted program instructions in an environment where security cannot always be maintained. The purpose of a secure cryptoprocessor is to act as the keystone of a security sub-system, eliminating the need to protect the rest of the sub-system with physical security measures. the features of the CryptoMemory are: Self-timed Write Cycles, Single-byte or Multiple-byte Page Write Mode and Programmable Access Rights for Each Zone.

references: Wikipedia: http://en.wikipedia.org/wiki/Secure_cryptoprocessor

Atmel CryptoMemory: http://www.atmel.com/products/security-ics/secure-memory/default.aspx?tab=documents