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Introduced by von Ahn et al. (STOC’05), covert two-party computation is an appealing cryptographic primitive that allows Alice and Bob to securely evaluate a function on their secret inputs in a steganographic manner, i.e., even the existence of a computation is oblivious to each party - unless the output of the function is favourable to both. A prominent form of covert computation is covert authentication, where Alice and Bob want to authenticate each other based on their credentials, in a way such that the party who does not hold the appropriate credentials cannot pass the authentication a...

Blockchain is a distributed ledger in which a database is distributed across numerous users. Blockchain technologies have recently come to the forefront of the research and industrial communities as they bring potential benefits for many industries. A ring signature is a special type of digital signature which has been widely adopted to protect anonymity and privacy in many cryptocurrencies and blockchain applications. Especially, a unique ring signature offers a special feature enabling the ability to determine whether a signer produces two different ring signatures of the same message with r...