Triplex: an Efficient and One-Pass Leakage-Resistant Mode of Operation

This paper introduces and analyzes Triplex, a leakage-resistant mode of operation based on Tweakable Block Ciphers (TBCs) with 2n-bit tweaks. Triplex enjoys beyond-birthday ciphertext integrity in the presence encryption decryption leakage liberal model where all intermediate computations are leaked full only two TBC calls operating long-term secret protected implementationlevel countermeasures. It provides confidentiality guarantees without leakage, standard for single-pass embedding re-keying process bulk its (i.e., birthday under bounded assumption). improves modes relying TBCs n-bit tweaks when instantiated large-tweak like Deoxys-TBC (a CAESAR competition laureate) or Skinny (used by Romulus finalist NIST lightweight crypto competition). Its security maintained multi-user setting.