Mridul Nandi
Applied Staistics Unit,
Indian Statistical Institute
203 B. T. Road
Kolkata 700124
Phone: +91 33 2575-2815 (office)
email: mridul at isical dot ac dot in

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My Papers

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Analyzing Hash Functions in Theoretical Perspective:
Papers: FSE-10, FSE-08 FSE-05 Asiacrypt-06 Indocrpyt-09 Indocrypt-06 Indocrypt-05
Pseudorandom oracle (PRO) is an equivalent term for Indifferentiability of hash function which informally means that it is indistinguishable from random oracle with a proper model of adversary. We know many modes of hash function which preserves the PRO property. We study PRO security for the popular designs JH, chop-MD, PGV, general domain extension or GDE etc.We also provide multicollision (many message collide to the same output) for a class of sequential domain extensions.

Pseudorandom Function and MAC Security Analysis
Papers: JMC-09, JMC-08 FSE-10 FSE-09 Indocrpyt-08 Indocrypt-06          
PRF is indistinguishable from a random function (random oracle in secret key mode). MAC has weaker property called unforgeability. We provide improved PRF securitybounds for popular constructions and we propose efficient and secure MAC too.

Security Analysis of Different Modes of Operations of Encryption:
Papers: CyS-08, FSE-08 Indocrypt-08
Designing wide block cipher from a  traditional blockcipher is popularly knmown as modes of opeartions. We provide improved security analysis of HCTR and propose a generic method to obtain a modes of operation. We also study security of online cipher HCBC and proposed modified HCBC which are more efficient.  

Universal One-Way Hash Function or UOWHF
Papers: SAC-04, Asiacrypt-03 ACISP-04 IEICE-05 IEICE-05
UOWHF is also popularly known as target collision resistant. It is defined for a hash family H(K,.). Adversary has to commit a message M and then given a random  key K  it has to find  M' different from M such that H(K,M) = H(K,M'). We have proposed different designs of UOWHF for arbitrary domain given small domain UOWHF (i.e. UOWHF-preserving domain extensions). Some of the designs are optimal in wide subclasses of designs. We study the UOWHF propoerty for PGV domain extensions.
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