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RESEARCH INTEREST
CRYPTOLOGY - Analysis and Design of Block Ciphers - linear and differential analysis, algebraic analysis, SP networks, key scheduling,
- Stream Ciphers - algebraic analysis, linear masking, distinguishing attacks,
- Public-Key Cryptography - signcryption, parallel authenticated encryption, security of RSA,
- Multiparty Computations - secure computations in non-Abelian groups
- Hashing Algorithms - differential analysis, generic attacks, domain extenders, sibling intractable hashing, provably secure hashing, analysis of the SL2 hash, keyed hashing, analysis of SHA256, finding differential patterns, higher order universal one-way hash functions,
- Digital Signatures - proxy signatures, batch signature verification, multiple-time signatures, one-time proxy signatures, universal designated-verifier signatures,
- Key Distribution - key agreements, key management in multicast groups, malleability attacks on key agreements,
- Threshold Cryptography - cryptography in hierarchical groups, threshold fail-stop signatures, shared generation of pseudorandom functions,
- Secret Sharing - perfect and ideal secret sharing, threshold changeable secret sharing, verifiable secret sharing, cheating prevention and detection, cheating immune secret sharing, cumulative arrays, secret sharing in hierarchical groups, divisibility of shares, lattice-based threshold changeable Shamir and CRT secret sharing, multi-secret secret sharing,
- S-box Theory - non-linearity of power permutations, linear non-equivalence, homogeneous bent Boolean functions, constructions of cubic homogeneous Boolean bent functions, algebraic resiliency and immunity,
- Pseudorandomness - pseudorandom bit generators, pseudorandom function and permutation generators, one-way functions,
- Authentications - authentication codes, Latin squares,
- Quantum Cryptography
COMPUTER SECURITY - Database Security - access authorization in Object-Oriented databases, cryptographic mechanisms for authorization, multilevel security, discretionary access control,
- Intrusion Detection Systems - anomaly detection, misuse intrusion detections, Dempster-Shafer theory, host and network intrusion detection, honey pots,
- Copyright Protection - software fingerprints, watermarking schemes,
- E-Commerce - e-voting schemes, e-cheques, payment systems, micro-payments,
- E-Government - user identification, biometrics,