FIELD: radio engineering, communication.
SUBSTANCE: method includes a step, at an encryption device (710), of: determining whether the length of a message M is greater than, equal to or less than the length of a key k; and if the length of the message M is greater than the length of the key k, exactly k bits of the message M are encrypted; if the length of the message M is equal to the length of the key k, said k bits of the message M are encrypted; if the length of the message M is less than the length of the key k: the message M is connected in series with the next message to obtain a message which is elongated by at least k bits. At least one next message contains bit stream data and is the payload of the next packet; and exactly k bits of the elongated message are encrypted, wherein the message M is the payload of the packet and contains bit stream data.
EFFECT: high encryption efficiency.
6 cl, 9 dwg
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