| http://www.w3.org/ns/prov#value | - Method as claimed in claim 7, further comprising the steps: encrypting the already encrypted symmetric key in the sending device by a private key of an asymmetric key having a private key and a public key and belonging to the sender, obtaining the sender public key by the receiving device, such as from the sending device or a separate server; decrypting the symmetric key by the public key of the s
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