Not much discussion :) Three of the authors are part of the Keccak team [1], which won SHA-3. This paper presents a new pseudorandom function (PRF) called Xood

Not much discussion :) Three of the authors are part of the Keccak team [1], which won SHA-3. This paper presents a new pseudorandom function (PRF) called Xoodoo, which is based on the team’s recently developed construction Farfalle [2]. Judging by the fact that the Xoodoo PRF suite has the same design goals as last year’s Gimli permutation [3], this is intended to be an especially useful primitive for embedded and low power systems. This has been a push in the research community for the last few years. The authors also introduce a “Doubly Extendable Cryptographic Keyed” function (a “Deck function”) in this paper. This function incrementally computes a pseudorandom string from a sequence of input strings. It natively offers authenticated encryption in one primitive - that’s not new for cryptography, but it’s another large focus in the research community because it neatly handles confidentiality, integrity and authentication while tying off nonce misuse. Deck-SANE (used in Xoofff-SANE, both introduced here) is the primitive providing authenticated encryption with an initial nonce. According to the authors it supersedes their previous attempt at session authenticated encryption in the Farfalle-SAE primitive, which was found to be vulnerable. Deck-SANSE (used in Xoofff-SANSE, again both introduced here) is like Deck-SANE, except it uses a synthetic nonce for authenticated encryption. Practically this means users need to ensure a different key/nonce combination is used at the beginning of each session for Deck-SANE, whereas they need not for Deck-SANSE. This likewise supersedes the authors’ previous work Farfalle-SIV for similar reasons. From there the authors introduce new block-cipher specifications based on the Xoofff PRFs, called Xoofff-WBC and Xoofff-WBC-AE. As you could guess Xoofff-WBC-AE is the authenticated encryption cipher built over the vanilla Xoofff-WBC cipher. ____________________ 1. https://keccak.team https://keccak.team 2. https://keccak.team/farfalle.html https://keccak.team/farfalle.html 3. https://gimli.cr.yp.to/gimli-20170627.pdf https://gimli.cr.yp.to/gimli-20170627.pdf