This book constitutes the refereed proceedings of the 10th International Conference on Cryptology in India, INDOCRYPT 2009, held in New Dehli, India, in December 2009.

The 28 revised full papers were carefully reviewed and selected from 104 submissions. The papers are organized in topical sections on post-quantum cryptology, key agreement protocols, side channel attacks, symmetric cryptology, hash functions, number theoretic cryptology, lightweight cryptology, signature protocols, and multiparty computation.

Asiacrypt, the annual conference of cryptology sponsored by IACR is now 11 years old. Asiacrypt 2005 was held during December 4-8, 2005, at Hotel Taj Coromandel, Chennai, India.This conferencewasorganizedby theInternational Association for Cryptologic Research (IACR) in cooperation with the Indian Institute of Technology (IIT), Chennai. Thisyearatotalof237papersweresubmittedtoAsiacrypt2005.Thesubm- sionscoveredallareasofcryptographicresearchrepresentingthecurrentstateof work in the crypto community worldwide. Each paper was blind reviewed by at least three members of the Program Committee and papers co-authored by the PC members were reviewed by at least six members. This ?rst phase of review by the PC members was followed by a detailed discussion on the papers. At the end of the reviewing process 37 papers were accepted and were presented at the conference. The proceedings contain the revised versionsof the accepted papers. In addition we were fortunate to have Prof. Andrew Yao and Prof. Bart Preneel as invited speakers. Based on a discussion and subsequent voting among the PC members, the Best Paper Award for this year's Asiacrypt was conferred to Pascal Paillier and Damien Vergnaud for the paper entitled "Discrete-Log-Based Signatures May Not Be Equivalent to Discrete Log." I would like to thank the following people. First, the General Chair, Prof.

2.1 Di?erential Power Analysis Di?erential Power Analysis (DPA) was introduced by Kocher, Ja?e and Jun in 1998 [13] and published in 1999 [14]. The basic idea is to make use of potential correlations between the data handled by the micro-controller and the electric consumption measured values. Since these correlations are often very low, s- tistical methods must be applied to deduce su?cient information from them. Theprinciple ofDPAattacksconsistsincomparingconsumptionvalues m- suredonthe real physical device (for instance a GSM chip or a smart card)with values computed in an hypothetical model of this device (the hypotheses being made among others on the nature of the implementation, and chie?y on a part of the secret key). By comparing these two sets of values, the attacker tries to recover all or part of the secret key. The initial target of DPA attacks was limited to symmetric algorithms. V- nerability of DES - ?rst shown by Kocher, Ja?e and Jun [13, 14]-wasfurther studied by Goubin and Patarin [11, 12], Messerges, Dabbish, Sloan [16]and Akkar, B' evan, Dischamp, Moyart [2]. Applications of these attacks were also largely taken into account during the AES selection process, notably by Biham, Shamir [4], Chari, Jutla, Rao, Rohatgi [5] and Daemen, Rijmen [8].

This book constitutes the refereed proceedings of the First International Conference on Cryptology in India, INDOCRYPT 2000, held in Calcutta, India in December 2000. The 25 revised full papers presented were carefully reviewed and selected from a total of 54 submissions. The book offers topical sections on stream ciphers and Boolean functions, cryptoanalysis: stream ciphers, cryptanalysis: block ciphers, electronic cash and multiparty computation, digital signatures, elliptic curves, fast arithmetic, cryptographic protocols, and block cipher and public key cryptography.