| 摘要 |
A method and apparatus for end-to-end encrypted communication. In the user terminal is stored a set of keys applicable in end-to-end encryption of communications. One or more of the keys are associated with a validity indication that indicates a cryptographic group in which the key is to be applied, and a period during which the key is applicable in that particular cryptographic group. When the user terminal connects to communication of the cryptographic group, the key to be applied is selected from the stored set of keys on the basis of the present cryptographic group and the present time according to the associated validity indications.
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