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Use of unpredictable information to minimize the leak of chip cards and other cryptosystems
Use of unpredictable information to minimize the leak of chip cards and other cryptosystems
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机译:使用不可预测的信息来最大程度地减少芯片卡和其他密码系统的泄漏
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摘要
A method of and cryptographic processing device for securely performing a cryptographic processing operation implementing a permutation in a manner resistant to discovery of a secret within a cryptographic processing device by external monitoring, operates by receiving a quantity to be cryptographically processed; generating unpredictable information; using the unpredictable information while processing the quantity to conceal a correlation between externally monitorable signals and the secret, this being achieved by performing a computation and incorporating the result of the computation in the cryptographic processing, and performing a computation the output of which is not incorporated in the cryptographic processing; and outputting the cryptographically processed quantity to a recipient thereof. The unpredictable information thus conceals a correlation between externally monitorable signals and the secret by randomizing the order of the permutation.
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