CASE: A New Frontier in Public-Key Authenticated Encryption

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Shashank Agrawal, Shweta Agrawal, Manoj Prabhakaran, Rajeev Raghunath, Jayesh Singla

Published: 2023, Last Modified: 14 Jan 2026TCC (2) 2023EveryoneRevisionsBibTeXCC BY-SA 4.0
Abstract: We introduce a new cryptographic primitive, called Completely Anonymous Signed Encryption (CASE). CASE is a public-key authenticated encryption primitive, that offers anonymity for senders as well as receivers. A “case-packet” should appear, without a (decryption) key for opening it, to be a blackbox that reveals no information at all about its contents. To decase a case-packet fully–so that the message is retrieved and authenticated–a verification key is also required.