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An approach to solving the problem of revocation of the signature authority of some group member in lattice-based group signature schemes has been suggested. The security of VLR schemes is based on delegating additional rights to opening manager, i.e., on checking the presence of user certificate in revocation list.
In the context of an unsecure transmission channel, identity-based cryptography makes it possible to implement broadcast data transfer for a large number of recipients much more effective than classical public-key cryptography. A comparative analysis of such schemes is carried out and recommendations on selecting a particular scheme based on the system… (More)