| 摘要 |
<p>A method for server-authorised service access from portable electronic microcircuit devices such as smart cards is disclosed. According to the method, when access is requested, the portable device transmits at least one identification sequence containing at least the value of a ciphertext (Ci) produced by executing an iterative algorithm (A2) based on a non-reversible secret-key function (F2), and the server computes a series of ciphertexts (Q1, Q2, ...) from one ciphertext (Q0) using the same algorithm (A2) until a ciphertext (Qn) is found that has the same value as said ciphertext (Ci), whereafter access is enabled. The method is particularly suitable for home banking applications.</p> |
