Cryptography method and smart cards microcircuit
First Claim
1. Method of cryptography comprising cryptographic computation steps implemented by a smart card comprising a central processing unit, said method furthermore implementing one or more precomputation steps, characterized in that said precomputation step or steps are performed by the smart card itself and in that said precomputation step or steps are performed at a session operated by the smart card and during input-output waiting periods of its central processing unit.
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Abstract
Method of cryptography in a smart card comprising a central processing unit, said method implementing precomputation operations, characterized in that said precomputation operations are performed by the smart card and in that the precomputation operations are carried out at a session during the waiting periods of the inputs/outputs of the central processing unit.
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Citations
13 Claims
- 1. Method of cryptography comprising cryptographic computation steps implemented by a smart card comprising a central processing unit, said method furthermore implementing one or more precomputation steps, characterized in that said precomputation step or steps are performed by the smart card itself and in that said precomputation step or steps are performed at a session operated by the smart card and during input-output waiting periods of its central processing unit.
- 5. Microcircuit for smart card capable of communicating with the exterior through an input-output interface (I), comprising task-execution means (ET) including a computation task (PC) and means (GE) for the management of the execution of the tasks, characterized in that the management means (GE) comprise means (APC) for the activation of the computation task (PC) during the waiting times pertaining to the other task or tasks active on the microcircuit.
Specification