{"abstract":[{"text":"We propose a new mode of operation, enciphered CBC, for domain extension of length-preserving functions (like block ciphers), which is a variation on the popular CBC mode of operation. Our new mode is twice slower than CBC, but has many (property-preserving) properties not enjoyed by CBC and other known modes. Most notably, it yields the first constant-rate Variable Input Length (VIL) MAC from any length preserving Fixed Input Length (FIL) MAC. This answers the question of Dodis and Puniya from Eurocrypt 2007. Further, our mode is a secure domain extender for PRFs (with basically the same security as encrypted CBC). This provides a hedge against the security of the block cipher: if the block cipher is pseudorandom, one gets a VIL-PRF, while if it is &quot;only&quot; unpredictable, one &quot;at least&quot; gets a VIL-MAC. Additionally, our mode yields a VIL random oracle (and, hence, a collision-resistant hash function) when instantiated with length-preserving random functions, or even random permutations (which can be queried from both sides). This means that one does not have to re-key the block cipher during the computation, which was critically used in most previous constructions (analyzed in the ideal cipher model). ","lang":"eng"}],"publication_status":"published","quality_controlled":0,"title":"A new mode of operation for block ciphers and length preserving MACs","alternative_title":["LNCS"],"_id":"3224","author":[{"first_name":"Yevgeniy","full_name":"Dodis, Yevgeniy","last_name":"Dodis"},{"last_name":"Pietrzak","id":"3E04A7AA-F248-11E8-B48F-1D18A9856A87","first_name":"Krzysztof Z","full_name":"Krzysztof Pietrzak","orcid":"0000-0002-9139-1654"},{"last_name":"Puniya","first_name":"Prashant","full_name":"Puniya, Prashant"}],"doi":"10.1007/978-3-540-78967-3_12","conference":{"name":"EUROCRYPT: Theory and Applications of Cryptographic Techniques"},"intvolume":"      4965","extern":1,"type":"conference","publist_id":"3456","date_updated":"2021-01-12T07:41:55Z","volume":4965,"date_published":"2008-04-28T00:00:00Z","day":"28","year":"2008","status":"public","publisher":"Springer","page":"198 - 219","month":"04","date_created":"2018-12-11T12:02:07Z","citation":{"apa":"Dodis, Y., Pietrzak, K. Z., &#38; Puniya, P. (2008). A new mode of operation for block ciphers and length preserving MACs (Vol. 4965, pp. 198–219). Presented at the EUROCRYPT: Theory and Applications of Cryptographic Techniques, Springer. <a href=\"https://doi.org/10.1007/978-3-540-78967-3_12\">https://doi.org/10.1007/978-3-540-78967-3_12</a>","chicago":"Dodis, Yevgeniy, Krzysztof Z Pietrzak, and Prashant Puniya. “A New Mode of Operation for Block Ciphers and Length Preserving MACs,” 4965:198–219. Springer, 2008. <a href=\"https://doi.org/10.1007/978-3-540-78967-3_12\">https://doi.org/10.1007/978-3-540-78967-3_12</a>.","ista":"Dodis Y, Pietrzak KZ, Puniya P. 2008. A new mode of operation for block ciphers and length preserving MACs. EUROCRYPT: Theory and Applications of Cryptographic Techniques, LNCS, vol. 4965, 198–219.","ieee":"Y. Dodis, K. Z. Pietrzak, and P. Puniya, “A new mode of operation for block ciphers and length preserving MACs,” presented at the EUROCRYPT: Theory and Applications of Cryptographic Techniques, 2008, vol. 4965, pp. 198–219.","short":"Y. Dodis, K.Z. Pietrzak, P. Puniya, in:, Springer, 2008, pp. 198–219.","mla":"Dodis, Yevgeniy, et al. <i>A New Mode of Operation for Block Ciphers and Length Preserving MACs</i>. Vol. 4965, Springer, 2008, pp. 198–219, doi:<a href=\"https://doi.org/10.1007/978-3-540-78967-3_12\">10.1007/978-3-540-78967-3_12</a>.","ama":"Dodis Y, Pietrzak KZ, Puniya P. A new mode of operation for block ciphers and length preserving MACs. In: Vol 4965. Springer; 2008:198-219. doi:<a href=\"https://doi.org/10.1007/978-3-540-78967-3_12\">10.1007/978-3-540-78967-3_12</a>"}}