Hirendra Kumar Garai

I am learning to analyze symmetric-key ciphers such as stream ciphers, block ciphers using automated tools like SAT, MILP, CP solvers.

Research Topics

Some Selected Publications

• Improved Key-Recovery Attack on ChaCha Using Carry-Lock Method
  with N. K. Sharma, S. Dey — INDOCRYPT 2026 · to appear
• Improved differential-linear attacks on round-reduced Forró
  with S. Sahoo, M. Mandal, S. Dey, S. Sarkar — AMC 2027
• Grover on Chosen IV Related Key Attack Against GRAIN-128a
  with A. Maitra, A. Samanta, S. Kar, M. Mandal, S. Dey — INDOCRYPT 2023
• Cryptanalysis of Reduced Round ChaCha — New Attack and Deeper Analysis
  with S. Dey, S. Maitra — FSE 2023
• Enhanced Differential-Linear Attacks on Reduced Round ChaCha
  with S. Dey, N. K. Sharma, S. Sarkar — IEEE TIT 2023
• Revamped Differential-Linear Cryptanalysis on Reduced Round ChaCha
  with S. Dey, N. K. Sharma, S. Sarkar — EUROCRYPT 2022

Talks

• Cryptanalysis of Reduced Round ChaCha - New Attack & Deeper Analysis
  FSE 2023 · slides

Visits

• Visiting Researcher, TCG-CREST
  Jul' 2023 · Hosted by Prof. Arpita Maitra

I TA'd these courses during my PhD:

A small set of references that guide how I try to learn and work in cryptography. Sometimes I update this list along the way as I read and build.