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Tightness of the Security Bound of CENC Iwata, Tetsu Encryption mode blockcipher CENC provable security This talk presents an overview of recently developed encryption mode for blockciphers, called CENC. CENC has the following advantages: (1) beyond the birthday bound security, (2) security proofs with the standard PRP assumption, (3) highly efficient, (4) single blockcipher key, (5) fully parallelizable, (6) allows precomputation of keystream, and (7) allows random access. Then we discuss the tightness of its security bound, and give a partial answer to the open problem posed at FSE 2006. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Tetsu Iwata 2007 Is Part Of Dagstuhl Seminar Proceedings, Volume 7021, Symmetric Cryptography (2007) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DagSemProc.07021.10 urn:nbn:de:0030-drops-10169 https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07021.10 eng https://creativecommons.org/licenses/by/4.0/legalcode