Universite de Caen - UFR des Sciences
Departement d'informatique (Bureau S3-349)
Campus Cote de Nacre - BP 5186
Bd Marechal Juin - F-14032 Caen Cedex
Phone: (+33) 2 31 56 73 76 - Fax: (+33) 2 31 56 73 30

.: Professional activities :.

• Maitre de conferences at Ensicaen and member of GREYC
• Webpage of the weekly Crypto seminar
• Program Committee: SCC 2010, AFRICACRYPT 2011 WCCCS 2011 AFRICACRYPT 2012
• Organizing Committee: WCC 2011

.: Publication :.

• Journal
1. A. Otmani, J.P. Tillich and L. Dallot, Cryptanalysis of Two McEliece Cryptosystems Based on Quasi-Cyclic Codes, Special issues in Symbolic Computation and Cryptography, Mathematics in Computer Science, vol. 3, n. 2, January 2010, pp. 129-140. [DOI] [pdf]
2. J.C. Carlach and A. Otmani, A Systematic Construction of Self-Dual Codes, IEEE Transactions on Information Theory, vol. 49, n. 11, pp. 3005- 3009, November 2003.
3. P. Gaborit and A. Otmani, Experimental Construction of Self-Dual codes, Finite Fields and Their Applications 9 (2003), n. 3, pp. 372-394.
4. A. Otmani, Caracterisation des codes auto-duaux binaires de type II a partir du code de Hamming etendu [8,4,4], Comptes Rendus a l'Academie des Sciences, June 2003, vol. 336, n. 12, pp. 971-974(4).


• Conference
1. A. Otmani and J.P. Tillich, An Efficient Attack on All Concrete KKS Proposals, Post-Quantum Crytography (PQCrypto 2011), Taipei, Taiwan, December 2011.
2. J.C. Faugere, V. Gauthier-Umana, A. Otmani, L. Perret, J.P. Tillich, A Distinguisher for High Rate McEliece Cryptosystem, Proceedings of 2011 IEEE Information Theory Workshop (ITW 2011), Paraty, Brazsil, 16-20 october 2011.
3. J.C. Faugere, A. Otmani, L. Perret, J.P. Tillich, Algebraic Cryptanalysis of McEliece Variants with Compact Keys, Proceedings of the 29th International Conference on Cryptology - EUROCRYPT 2010, Nice, France, May 30-June 03 2010. [pdf]
4. T. Berger, P.L. Cayrel, P. Gaborit, A. Otmani, Reducing Key Length of the McEliece Cryptosystem, Proceedings of Second International Conference on Cryptology - AFRICACRYPT 2009, Gammarth, Tunisia, June 21-25 2009, pp. 77-97. [pdf]
5. P.L. Cayrel, A. Otmani and D. Vergnaud, On Kabatianskii-Krouk-Smeets Signatures, International Workshop on the Arithmetic of Finite Fields (WAIFI 2007), C. Carlet & B. Sunar, eds., Springer, Lect. Notes Comput. Sci. vol. 4547, Madrid, Spain, 21-22 June 2007, pp. 237-251.
6. L. Boubchir, A. Otmani and N. Zerida, The 2nd BOWS Contest: Wavelet-Based Bayesian Denoising Attack on Image Watermarking, International Conference on Intelligent Information Hiding and Multimedia Signal (IIHMSP '08), Harbin, China, August 15-17 2008, pp. 473-476.
7. A. Otmani, J.P. Tillich and I. Andriyanova, On the Minimum Distance of Generalized LDPC Codes, Proceedings of the 2007 IEEE International Symposium on Information Theory (ISIT 07), Nice, France, June 2007, pp. 751-755.
8. P. Gaborit and A. Otmani, Experimental Construction of Self-Dual Codes, Proceedings of the 2002 IEEE International Symposium on Information Theory (ISIT 2002), Lausanne, Switzerland, July 2002, p. 459.
9. E. Cadic, J.C. Carlach, G. Olocco, A. Otmani and J.P. Tillich, Low Complexity Tail-Biting Trellises of Self-Dual Codes of Length 24, 32 and 40 over GF(4) and Z₄ of Large Minimum Distance, Proc. 14th Int. Symp. Applied Algebra, Algebraic Algorithms and Error-Correcting Codes (AAECC 14), S. Boztas and I. Shparlinski (Eds.), Springer Verlag, November 2001, Melbourne, Australia, pp. 57-66.
10. J.C. Carlach, A. Otmani and C. Vervoux, A New Scheme for Building Good Self-Dual Block Codes, Proceedings of the 2000 IEEE International Symposium on Information Theory (ISIT 2000), Sorrento, Italia, 25-30 June 2000, p. 476.


• Workshop
1. J.C. Faugere, A. Otmani, L. Perret, J.P. Tillich, A Distinguisher for High Rate McEliece Cryptosystem, Yet Another Conference on Cryptography - YACC 2010, Porquerolles Island, France, 4-8 October, 2010.
2. J.C. Faugere, A. Otmani, L. Perret, J.P. Tillich, Algebraic Cryptanalysis of McEliece Variants with Compact Keys - Towards a Complexity Analysis, Yet Another Conference on Cryptography - YACC 2010, Porquerolles Island, France, 4-8 October 8, 2010.
3. J.C. Faugere, A. Otmani, L. Perret, J.P. Tillich, Algebraic Cryptanalysis of McEliece Variants with Compact Keys - Towards a Complexity Analysis, Proceedings of Second International Conference on Symbolic Computation and Cryptography (SCC 2010), C. Cid and J.C. Faugere (Eds.), Royal Holloway, University of London, Egham, UK, June 22-25, 2010, pp. 45-55. [pdf]
4. A. Otmani, J.P. Tillich and L. Dallot, Cryptanalysis of a McEliece Cryptosystem Based on Quasi-Cyclic LDPC Codes, Proceedings of First International Conference on Symbolic Computation and Cryptography (SCC 2008), Beijing, China, April 28-30 2008, pp. 69-81.
5. G. Olocco and A. Otmani, Low Complexity Tail-Biting trellises for Some Extremal Self-Dual Dual Codes, Proc. 8th International Workshop on Algebraic and Combinatorial Coding Theory (ACCT 8), St-Petersburg, Russia, September 2002, p.214.
6. P. Gaborit and A. Otmani, Experimental Constructions of Codes over Rings and Construction of an Optimal Unimodular Lattice in Dimension 43, Proc. 8th International Workshop on Algebraic and Combinatorial Coding Theory (ACCT 8), St-Petersburg, Russia, September 2002, p.128.
7. A. Otmani, A New Construction of Self-Dual Codes, Proc. 7th International Workshop on Algebraic and Combinatorial Coding Theory (ACCT 7), Bansko, Bulgaria, 18-24 June 2000, pp.255-260.