Cryptology ePrint Archive: Report 2020/1348

Vetted Encryption

Martha Norberg Hovd and Martijn Stam

Abstract: We introduce Vetted Encryption (VE), a novel cryptographic primitive, which addresses the following scenario: a receiver controls, or vets, who can send them encrypted messages. We model this as a filter publicly checking ciphertext validity, where the overhead does not grow with the number of senders. The filter receives one public key for verification, and every user receives one personal encryption key.

We present three versions: Anonymous, Identifiable, and Opaque VE (AVE, IVE and OVE), and concentrate on formal definitions, security notions and examples of instantiations based on preexisting primitives of the latter two. For IVE, the sender is identifiable both to the filter and the receiver, and we make the comparison with identity-based signcryption. For OVE, a sender is anonymous to the filter, but is identified to the receiver. OVE is comparable to group signatures with message recovery, with the important additional property of confidentiality of messages.

Category / Keywords: public-key cryptography / Encryption, Group Signatures, Signcryption

Original Publication (with major differences): INDOCRYPT 2020

Date: received 26 Oct 2020, last revised 14 Dec 2020

Contact author: martha at simula no,martijn@simula no

Available format(s): PDF | BibTeX Citation

Version: 20201214:155250 (All versions of this report)

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