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Revisiting the Security of DbHtS MACs: Beyond-Birthday-Bound in the Multi-user Setting

Lecture Notes in Computer Science, 2021
Double-block Hash-then-Sum (DbHtS) MACs are a class of MACs that aim for achieving beyond-birthday-bound security, including SUM-ECBC, PMAC_Plus, 3kf9 and LightMAC_Plus. Recently Datta et al. (FSE’19), and then Kim et al. (Eurocrypt’20) prove that DbHtS constructions are secure beyond the birthday bound in the single-user setting. However, by a generic
Yaobin Shen   +3 more
openaire   +3 more sources

POEx: A beyond-birthday-bound-secure on-line cipher

Cryptography and Communications, 2017
On-line ciphers are convenient building blocks for realizing efficient single- pass encryption. In particular, the trend to limit the consequences of nonce reuses rendered them popular in recent authenticated encryption schemes. While encryption schemes, such as POE, COPE, or the ciphers within ElmE/ElmD concentrated on efficiency, their security ...
Christian Forler   +3 more
openaire   +1 more source

Beyond Birthday Bound Secure MAC in Faulty Nonce Model

2019
Encrypt-then-MAC (EtM) is a popular mode for authenticated encryption (AE). Unfortunately, almost all designs following the EtM paradigm, including the AE suites for TLS, are vulnerable against nonce misuse. A single repetition of the nonce value reveals the hash key, leading to a universal forgery attack.
Avijit Dutta   +2 more
openaire   +1 more source

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