OleF: An inverse-free online cipher. Online ciphers, in spite of being insecure against an sprp adversary, can be desirable at places because of their ease of implementation and speed. Here we propose a single-keyed inverse-free construction that achieves online sprp security with an optimal number of blockcipher calls. We also include a partial block construction, without requiring any extra key

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  1. Forler, Christian; List, Eik; Lucks, Stefan; Wenzel, Jakob: \textscPOEx: a beyond-birthday-bound-secure on-line cipher (2018)