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- Sourav Sengupta, Subhamoy Maitra, Goutam Paul, Santanu Sarkar
- Journal of Cryptology
- 2012

RC4 has been the most popular stream cipher in the history of symmetric key cryptography. Its internal state contains a permutation over all possible bytes from 0 to 255, and it attempts to generate a pseudo-random sequence of bytes (called keystream) by extracting elements of this permutation. Over the last twenty years, numerous cryptanalytic results on… (More)

- Subhamoy Maitra, Santanu Sarkar
- ISC
- 2008

In this paper we revisit Wiener's method (IEEE-IT 1990) of continued fraction (CF) to find new weaknesses in RSA. We consider RSA with N = pq, q < p < 2q, public encryption exponent e and private decryption exponent d. Our motivation is to find out when RSA is insecure given d is O(N δ), where we are mostly interested in the range 0.3 ≤ δ ≤ 0.5. Given ρ (1… (More)

- Santanu Sarkar, Subhamoy Maitra
- Inf. Process. Lett.
- 2010

- Subhadeep Banik, Subhamoy Maitra, Santanu Sarkar
- IACR Cryptology ePrint Archive
- 2012

The 32-bit MAC of Grain-128a is a linear combination of the first 64 and then the alternative keystream bits. In this paper we describe a successful differential fault attack on Grain-128a, in which we recover the secret key by observing the correct and faulty MACs of certain chosen messages. The attack works due to certain properties of the Boolean… (More)

- Subhamoy Maitra, Santanu Sarkar, Anubhab Baksi, Pramit Dey
- IACR Cryptology ePrint Archive
- 2015

Design of secure lightweight stream ciphers is an important area in cryptographic hardware & embedded systems and a very recent design by Armknecht and Mikhalev (FSE 2015) has received serious attention that uses shorter internal state and still claims to resist the time-memory-data-tradeoff (TMDTO) attacks. An instantiation of this design paradigm is the… (More)

- Santanu Sarkar, Subhamoy Maitra
- IEEE Transactions on Information Theory
- 2009

In this paper, we analyze how to calculate the GCD of <i>k</i> ( ≥ 2) many large integers, given their approximations. This problem is known as the approximate integer common divisor problem in literature. Two versions of the problem, presented by Howgrave-Graham in CaLC 2001, turn out to be special cases of our analysis when <i>k</i> = 2. We relate… (More)

- Santanu Sarkar
- IACR Cryptology ePrint Archive
- 2015

The Modular Inversion Hidden Number Problem (MIHNP) was introduced by Boneh, Halevi and Howgrave-Graham in Asiacrypt 2001 (BHH'01). They provided two heuris-tics-in Method I, two-third of the output bits are required to solve the problem, whereas the more efficient heuristic (Method II) requires only one-third of the bits of the output. After more than a… (More)

- Subhadeep Banik, Subhamoy Maitra, Santanu Sarkar
- CHES
- 2012

- Santanu Sarkar
- INDOCRYPT
- 2011

- Santanu Sarkar
- Des. Codes Cryptography
- 2014

We consider an RSA variant with Modulus N = p 2 q. This variant is known as Prime Power RSA. In PKC 2004 May proved when decryption exponent d < N 0.22 , one can factor N in polynomial time. In this paper, we improve this bound upto N 0.395. We provide detailed experimental results to justify our claim.