On the Security of Triplex- and Multiplex-type Constructions with Smaller Tweaks

ePrint Report: On the Security of Triplex- and Multiplex-type Constructions with Smaller Tweaks

Nilanjan Datta, Avijit Dutta, Eik List, Sougata Mandal

In TCHES’22, Shen et al. proposed Triplex, a single-pass
leakage-resistant authenticated encryption scheme based on Tweakable Block Ciphers (TBCs) with 2n-bit tweaks. Triplex enjoys beyond-birthday-bound ciphertext integrity in the CIML2 setting and birthday-bound confidentiality in the CCAmL1 notion. Despite its strengths, Triplex’s operational efficiency was hindered by its sequential nature, coupled with a rate limit of 2/3. In an …

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