A circuit and a method are provided for securing a coprocessor dedicated to cryptography. The disclosed circuit includes a scrambling register and an accessory input register to convey scrambling information in the form of electrical signals that disturb the visibility of certain electrical signals associated with confidential information such as digital keys.

 
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> Cryptographic apparatus for performing cryptography on a specified area of content data

> Authorizing an additional computer program module for use with a core computer program
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