FIELD: radio engineering, communication.
SUBSTANCE: method for end-to-end encrypted communication includes: storing a set of keys suitable for end-to-end encrypted communication in a user terminal. One or more keys are associated with a validity indicator which defines a cryptographic group of two or more user terminals in which the corresponding key should be used, and a period during which said key is usable in said cryptographic group; connecting, at the user terminal, to the cryptographic group communication and selecting the key to be used from the stored set of keys based on said cryptographic group and current time in accordance with the associated validity indicator.
EFFECT: high data transmission safety.
20 cl
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