| 摘要 |
A method of generating an identity for a first party that changes over time and which can at all times be authenticated by second party wherein the method includes the steps of: ```the first and second parties establishing a secret between them, the secret including an entity the value of which changes over time and first and second cryptographically strong functions used to operate in sequence on the current value of that time dependent entity to generate an identity for the first party; and ```for predetermined intervals each of the first and second parties generating a fresh identity for the first party. In another embodiment the second function may operate on a combination of the result of the operation of the first function and a further, unpredictable, time-variable value, e.g. the closing value of the FTSE index. In a further embodiment the identity produced by the above methods may be used to generate a public/private key pair. The functions may be hash functions, e.g. SHA.
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