Research

Links

Google Scholar Page, DBLP Page

Conference/ePrint Papers

• PKC’26
  Registered Functional Encryption for Attribute-Weighted Sums with Access Control
  with Robert Schädlich

• Asiacrypt’25
  A General Framework for Registered Functional Encryption via User-Specific Pre-Constraining
  with Robert Schädlich

• Preprint
  Registered Functional Encryption for Pseudorandom Functionalities from Lattices: Registered ABE for Unbounded Depth Circuits and Turing Machines, and More
  with Robert Schädlich and Erkan Tairi

• Preprint
  Simple Public Key Anamorphic Encryption and Signature using Multi-Message Extensions
  with Shalini Banerjee, Andy Rupp and Daniel Slamanig

• PKC’25
  Multi-Client Attribute-Based Unbounded Inner Product Functional Encryption, and More
  with Subhranil Dutta, Aikaterini Mitrokotsa, Jenit Tomy

• Asiacrypt’24
  Registered FE beyond Predicates: (Attribute-Based) Linear Functions and more
  with Pratish Datta, Shota Yamada

• IEEE EuroS&P’24
  SACfe: Secure Access Control in Functional Encryption with Unbounded Data
  with Uddipana Dowerah, Subhranil Dutta, Frank Hartmann, Aikaterini Mitrokotsa, Sayantan Mukherjee

• Eurocrypt’24
  Certified Everlasting Secure Collusion-Resistant Functional Encryption, and More
  with Taiga Hiroka, Fuyuki Kitagawa, Tomoyuki Morimae, Ryo Nishimaki, Takashi Yamakawa

• PKC’23
  Decentralized Multi-Authority Attribute-Based Inner-Product FE: Large Universe and Unbounded
  with Pratish Datta

• ePrint (A shorter abstract is accepted by CiC)
  Embedded Identity Traceable Identity-Based IPFE from Pairings and Lattices
  with Subhranil Dutta, Amit Kumar Singh and Sourav Mukhopadhyay

• Asiacrypt’22
  Compact FE for Unbounded Attribute-Weighted Sums for Logspace from SXDH
  with Katsuyuki Takashima and Pratish Datta

• ProvSec’21
  Fully Secure Unbounded Zero Inner Product Encryption with Short Ciphertexts and Keys
  with Subhranil Dutta and Ratna Dutta

• Asiacrypt’21
  (Compact) Adaptively Secure FE for Attribute-Weighted Sums from k-Lin
  with Pratish Datta

• Latincrypt’21
  Attribute-Based Access Control for Inner Product Functional Encryption from LWE
  with Ratna Dutta

• ACISP’21
  Chosen Ciphertext Secure Functional Encryption from Constrained Witness PRF
  with Ratna Dutta

• ACISP’21
  CCA Secure Attribute-Hiding Inner Product Encryption from Minimal Assumption
  with Ratna Dutta

• CANS’20
  Chosen-Ciphertext Secure Multi-Identity and Multi-Attribute Pure FHE
  with Ratna Dutta

• ProvSec’20
  Semi-Adaptively Secure Offline Witness Encryption from Puncturable Witness PRF
  with Ratna Dutta

• ACISP’19
  Offline Witness Encryption from Witness PRF and Randomized Encoding in CRS Model
  with Ratna Dutta

Journal Publications

• IACR CiC’25
  Fully Collusion Resistant Traceable Identity-Based Inner Product Functional Encryption
  with Subhranil Dutta, Amit Kumar Singh and Sourav Mukhopadhyay

• DCC’24 | ePrint
  Compact FE for Unbounded Attribute-Weighted Sums for Logspace from SXDH
  with Katsuyuki Takashima and Pratish Datta

• TCS’24
  Reinforcing Privacy in Cloud Computing via Adaptively Secure Non-Zero Inner Product Encryption and Anonymous Identity-Based Revocation in Unbounded Setting
  with Subhranil Dutta and Ratna Dutta

• JoC’23 | eprint
  Unbounded Predicate Inner Product Functional Encryption from Pairings
  with Uddipana Dowerah, Subhranil Dutta, Aikaterini Mitrokotsa, Sayantan Mukherjee

• DCC’23 | ePrint
  (Compact) Adaptively Secure FE for Attribute-Weighted Sums from k-Lin
  with Pratish Datta

Patents Filed/Published

• US Patent | PCT/US2024/011273
  Decentralized multi-authority attribute-based encryption for large universe and unbounded
  invented with Pratish Datta, filed by NTT Research, lnc.

• US Patent | PCT/US2023/078860
  Compact functional encryption for unbounded attribute-weighted sums
  invented with Pratish Datta, filed by NTT Research, lnc.

• US, JP, EP Patent | EP23165683.6A
  Decentralized multi-authority attribute-based inner-product functional encryption
  invented with Pratish Datta and Monosij Maitra filed by NTT Research, lnc.

• US Patent | PCT/US2022/039569
  Compact Adaptively Secure Functional Encryption For Attribute-Weighted Sums
  invented with Pratish Datta, filed by NTT Research, lnc.

Project Grant

• Swiss National Science Foundation | Grant IZSEZ0220423
  Multi-client Unbounded Attribute-Based Inner Product Functional Encryption
  in collaboration with _Prof. Dr. Katerina Mitrokotsa of University of St. Gallen
  Completed with 3 publications at JoC, IEEE-EuroSP, PKC

Professional Contribution

Reviewer or Subreviewer

IEEE-IT, TCS, DCC, ACNS’22, IEEE-IFS, IET-IS, CSI, JCEN, AsiaCCS’22, INDOCRYPT’{20, 21}, TCC’22, PKC’23, ASIACRYPT’{23, 25}, AsiaCCS’24, Eurocrypt’{24, 25}, Crypto’{22, 24, 25, 26}

Program Committee

ACM CCS’{24, 26}, ACM APKC’26, ACM WWW’26, Indocrypt’{24, 25}, ICSP’{24, 25}