| 摘要 |
<p>The invention concerns an asymmetrical cryptographic method applied to a message M, characterized in that it includes a private operation which consists in signing or decrypting the message M to obtain a signed or decrypted message s, the private operation being defined based on at least one modular exponentiation EM in the form EM = MA modB, A and B being respectively the exponent and the modular exponentiation EM, and the private operation including the following steps: calculating an intermediate module B*, an intermediate message M* and an intermediate exponent A*, based on B, M and/or A; the intermediate module B* being deterministically calculated and the intermediate message M* being randomly calculated; calculating an intermediate modular exponentiationEM* = M*<SUP>A*</SUP> mod B*; calculating the signed or decrypted message s based on the intermediate modular exponentiation EM*. The invention also concerns an electronic component comprising means for implementing said cryptographic method.</p> |
