caa a22 4500 606148922 CHVBK 20210128100531.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00145-013-9162-9 doi (NATIONALLICENCE)springer-10.1007/s00145-013-9162-9 New Attacks on IDEA with at Least 6 Rounds [Elektronische Daten] [Eli Biham, Orr Dunkelman, Nathan Keller, Adi Shamir] IDEA is a 64-bit block cipher with 128-bit keys which was introduced by Lai and Massey in 1991. The best previously published attack on IDEA could only handle 6 of its 8.5-rounds. In this paper, we combine a highly optimized meet-in-the-middle attack with a keyless version of the Biryukov-Demirci relation to obtain a greatly improved attack on 6-round IDEA which requires only two known plaintexts, and the first key recovery attacks on versions of IDEA with 6.5 to 8.5 rounds. International Association for Cryptologic Research, 2013 IDEA nationallicence Cryptanalysis nationallicence Biryukov-Demirci relation nationallicence Zero-in-the-Middle attack nationallicence Biham Eli Computer Science Department, Technion, 32000, Haifa, Israel aut Dunkelman Orr Computer Science Department, University of Haifa, 31905, Haifa, Israel aut Keller Nathan Faculty of Mathematics and Computer Science, Weizmann Institute of Science, P.O. Box 26, 76100, Rehovot, Israel aut Shamir Adi Faculty of Mathematics and Computer Science, Weizmann Institute of Science, P.O. Box 26, 76100, Rehovot, Israel aut Journal of Cryptology Springer US; http://www.springer-ny.com 28/2(2015-04-01), 209-239 0933-2790 28:2<209 2015 28 145 https://doi.org/10.1007/s00145-013-9162-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00145-013-9162-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Biham Eli Computer Science Department, Technion, 32000, Haifa, Israel aut NATIONALLICENCE 700 1- Dunkelman Orr Computer Science Department, University of Haifa, 31905, Haifa, Israel aut NATIONALLICENCE 700 1- Keller Nathan Faculty of Mathematics and Computer Science, Weizmann Institute of Science, P.O. Box 26, 76100, Rehovot, Israel aut NATIONALLICENCE 700 1- Shamir Adi Faculty of Mathematics and Computer Science, Weizmann Institute of Science, P.O. Box 26, 76100, Rehovot, Israel aut NATIONALLICENCE 773 0- Journal of Cryptology Springer US; http://www.springer-ny.com 28/2(2015-04-01), 209-239 0933-2790 28:2<209 2015 28 145