publications

2026

1. CRYPTO

   Simple Public Key Anamorphic Encryption and Signature using Multi-Message Extensions

   Shalini Banerjee, Tapas Pal, Andy Rupp, and Daniel Slamanig

   In Annual International Cryptology Conference (CRYPTO), 2026

   Bib HTML

   @inproceedings{banerjee2026anamorphic,
     title = {Simple Public Key Anamorphic Encryption and Signature using Multi-Message Extensions},
     author = {Banerjee, Shalini and Pal, Tapas and Rupp, Andy and Slamanig, Daniel},
     booktitle = {Annual International Cryptology Conference (CRYPTO)},
     year = {2026},
   }

2. PKC

   Registered Functional Encryption for Attribute-Weighted Sums with Access Control

   Tapas Pal and Robert Schädlich

   In IACR International Conference on Practice and Theory of Public-Key Cryptography (PKC), 2026

   Bib HTML

   @inproceedings{pal2026registered,
     title = {Registered Functional Encryption for Attribute-Weighted Sums with Access Control},
     author = {Pal, Tapas and Sch{\"a}dlich, Robert},
     booktitle = {IACR International Conference on Practice and Theory of Public-Key Cryptography (PKC)},
     year = {2026},
   }

2025

1. ASIACRYPT

   A General Framework for Registered Functional Encryption via User-Specific Pre-Constraining

   Tapas Pal and Robert Schädlich

   In International Conference on the Theory and Application of Cryptology and Information Security (ASIACRYPT), 2025

   Bib HTML

   @inproceedings{pal2025framework,
     title = {A General Framework for Registered Functional Encryption via User-Specific Pre-Constraining},
     author = {Pal, Tapas and Sch{\"a}dlich, Robert},
     booktitle = {International Conference on the Theory and Application of Cryptology and Information Security (ASIACRYPT)},
     year = {2025},
   }

2. ePrint

   Registered Functional Encryption for Pseudorandom Functionalities from Lattices: Registered ABE for Unbounded Depth Circuits and Turing Machines, and More

   Tapas Pal, Robert Schädlich, and Erkan Tairi

   2025

   Bib HTML

   @misc{pal2025registeredprf,
     title = {Registered Functional Encryption for Pseudorandom Functionalities from Lattices: Registered ABE for Unbounded Depth Circuits and Turing Machines, and More},
     author = {Pal, Tapas and Sch{\"a}dlich, Robert and Tairi, Erkan},
     howpublished = {Cryptology ePrint Archive, Paper 2025/967},
     year = {2025},
   }

3. PKC

   Multi-Client Attribute-Based Unbounded Inner Product Functional Encryption, and More

   Subhranil Dutta, Aikaterini Mitrokotsa, Tapas Pal, and Jenit Tomy

   In IACR International Conference on Practice and Theory of Public-Key Cryptography (PKC), 2025

   Bib HTML

   @inproceedings{dutta2025multiclient,
     title = {Multi-Client Attribute-Based Unbounded Inner Product Functional Encryption, and More},
     author = {Dutta, Subhranil and Mitrokotsa, Aikaterini and Pal, Tapas and Tomy, Jenit},
     booktitle = {IACR International Conference on Practice and Theory of Public-Key Cryptography (PKC)},
     year = {2025},
   }

4. CiC

   Fully Collusion Resistant Traceable Identity-Based Inner Product Functional Encryption

   Subhranil Dutta, Sourav Mukhopadhyay, Tapas Pal, and Amit Kumar Singh

   IACR Communications in Cryptology (CiC), 2025

   Bib HTML

   @article{dutta2025fully,
     title = {Fully Collusion Resistant Traceable Identity-Based Inner Product Functional Encryption},
     author = {Dutta, Subhranil and Mukhopadhyay, Sourav and Pal, Tapas and Singh, Amit Kumar},
     journal = {IACR Communications in Cryptology (CiC)},
     year = {2025},
   }

2024

1. ASIACRYPT

   Registered FE beyond Predicates: (Attribute-Based) Linear Functions and more

   Pratish Datta, Tapas Pal, and Shota Yamada

   In International Conference on the Theory and Application of Cryptology and Information Security (ASIACRYPT), 2024

   Bib HTML

   @inproceedings{datta2024registered,
     title = {Registered FE beyond Predicates: (Attribute-Based) Linear Functions and more},
     author = {Datta, Pratish and Pal, Tapas and Yamada, Shota},
     booktitle = {International Conference on the Theory and Application of Cryptology and Information Security (ASIACRYPT)},
     year = {2024},
   }

2. EuroS&P

   SACfe: Secure Access Control in Functional Encryption with Unbounded Data

   Uddipana Dowerah, Subhranil Dutta, Frank Hartmann, Aikaterini Mitrokotsa, Sayantan Mukherjee, and 1 more author

   In IEEE European Symposium on Security and Privacy (EuroS&P), 2024

   Bib HTML

   @inproceedings{dowerah2024sacfe,
     title = {SACfe: Secure Access Control in Functional Encryption with Unbounded Data},
     author = {Dowerah, Uddipana and Dutta, Subhranil and Hartmann, Frank and Mitrokotsa, Aikaterini and Mukherjee, Sayantan and Pal, Tapas},
     booktitle = {IEEE European Symposium on Security and Privacy (EuroS\&P)},
     year = {2024},
   }

3. EUROCRYPT

   Certified Everlasting Secure Collusion-Resistant Functional Encryption, and More

   Taiga Hiroka, Fuyuki Kitagawa, Tomoyuki Morimae, Ryo Nishimaki, Tapas Pal, and 1 more author

   In Annual International Conference on the Theory and Applications of Cryptographic Techniques (EUROCRYPT), 2024

   Bib HTML

   @inproceedings{hiroka2024certified,
     title = {Certified Everlasting Secure Collusion-Resistant Functional Encryption, and More},
     author = {Hiroka, Taiga and Kitagawa, Fuyuki and Morimae, Tomoyuki and Nishimaki, Ryo and Pal, Tapas and Yamakawa, Takashi},
     booktitle = {Annual International Conference on the Theory and Applications of Cryptographic Techniques (EUROCRYPT)},
     year = {2024},
   }

4. DCC

   Compact FE for Unbounded Attribute-Weighted Sums for Logspace from SXDH

   Pratish Datta, Tapas Pal, and Katsuyuki Takashima

   Designs, Codes and Cryptography (DCC), 2024

   Bib HTML

   @article{datta2024compactjournal,
     title = {Compact FE for Unbounded Attribute-Weighted Sums for Logspace from SXDH},
     author = {Datta, Pratish and Pal, Tapas and Takashima, Katsuyuki},
     journal = {Designs, Codes and Cryptography (DCC)},
     year = {2024},
   }

5. TCS

   Reinforcing Privacy in Cloud Computing via Adaptively Secure Non-Zero Inner Product Encryption and Anonymous Identity-Based Revocation in Unbounded Setting

   Ratna Dutta, Subhranil Dutta, and Tapas Pal

   Theoretical Computer Science (TCS), 2024

   Bib HTML

   @article{dutta2024reinforcing,
     title = {Reinforcing Privacy in Cloud Computing via Adaptively Secure Non-Zero Inner Product Encryption and Anonymous Identity-Based Revocation in Unbounded Setting},
     author = {Dutta, Ratna and Dutta, Subhranil and Pal, Tapas},
     journal = {Theoretical Computer Science (TCS)},
     year = {2024},
   }

6. Patent

   Decentralized multi-authority attribute-based encryption for large universe and unbounded

   Pratish Datta and Tapas Pal

   2024

   PCT/US2024/011273, filed by NTT Research, Inc.

   HTML

2023

1. PKC

   Decentralized Multi-Authority Attribute-Based Inner-Product FE: Large Universe and Unbounded

   Pratish Datta and Tapas Pal

   In IACR International Conference on Practice and Theory of Public-Key Cryptography (PKC), 2023

   Bib HTML

   @inproceedings{datta2023decentralized,
     title = {Decentralized Multi-Authority Attribute-Based Inner-Product FE: Large Universe and Unbounded},
     author = {Datta, Pratish and Pal, Tapas},
     booktitle = {IACR International Conference on Practice and Theory of Public-Key Cryptography (PKC)},
     year = {2023},
   }

2. JoC

   Unbounded Predicate Inner Product Functional Encryption from Pairings

   Uddipana Dowerah, Subhranil Dutta, Aikaterini Mitrokotsa, Sayantan Mukherjee, and Tapas Pal

   Journal of Cryptology (JoC), 2023

   Bib HTML

   @article{dowerah2023unbounded,
     title = {Unbounded Predicate Inner Product Functional Encryption from Pairings},
     author = {Dowerah, Uddipana and Dutta, Subhranil and Mitrokotsa, Aikaterini and Mukherjee, Sayantan and Pal, Tapas},
     journal = {Journal of Cryptology (JoC)},
     year = {2023},
   }

3. DCC

   (Compact) Adaptively Secure FE for Attribute-Weighted Sums from k-Lin

   Pratish Datta and Tapas Pal

   Designs, Codes and Cryptography (DCC), 2023

   Bib HTML

   @article{datta2023adaptivelyjournal,
     title = {(Compact) Adaptively Secure FE for Attribute-Weighted Sums from k-Lin},
     author = {Datta, Pratish and Pal, Tapas},
     journal = {Designs, Codes and Cryptography (DCC)},
     year = {2023},
   }

4. Patent

   Compact functional encryption for unbounded attribute-weighted sums

   Pratish Datta and Tapas Pal

   2023

   PCT/US2023/078860, filed by NTT Research, Inc.

   HTML
5. Patent

   Decentralized multi-authority attribute-based inner-product functional encryption

   Pratish Datta, Monosij Maitra, and Tapas Pal

   2023

   EP23165683.6A, filed by NTT Research, Inc.

   HTML

2022

1. ePrint

   Embedded Identity Traceable Identity-Based IPFE from Pairings and Lattices

   Subhranil Dutta, Sourav Mukhopadhyay, Tapas Pal, and Amit Kumar Singh

   2022

   Bib HTML

   @misc{dutta2022embedded,
     title = {Embedded Identity Traceable Identity-Based IPFE from Pairings and Lattices},
     author = {Dutta, Subhranil and Mukhopadhyay, Sourav and Pal, Tapas and Singh, Amit Kumar},
     howpublished = {Cryptology ePrint Archive, Paper 2022/1196 (shorter version at IACR CiC)},
     year = {2022},
   }

2. ASIACRYPT

   Compact FE for Unbounded Attribute-Weighted Sums for Logspace from SXDH

   Pratish Datta, Tapas Pal, and Katsuyuki Takashima

   In International Conference on the Theory and Application of Cryptology and Information Security (ASIACRYPT), 2022

   Bib HTML

   @inproceedings{datta2022compact,
     title = {Compact FE for Unbounded Attribute-Weighted Sums for Logspace from SXDH},
     author = {Datta, Pratish and Pal, Tapas and Takashima, Katsuyuki},
     booktitle = {International Conference on the Theory and Application of Cryptology and Information Security (ASIACRYPT)},
     year = {2022},
   }

3. Patent

   Compact Adaptively Secure Functional Encryption For Attribute-Weighted Sums

   Pratish Datta and Tapas Pal

   2022

   PCT/US2022/039569, filed by NTT Research, Inc.

   HTML

2021

1. ProvSec

   Fully Secure Unbounded Zero Inner Product Encryption with Short Ciphertexts and Keys

   Ratna Dutta, Subhranil Dutta, and Tapas Pal

   In International Conference on Provable Security (ProvSec), 2021

   Bib HTML

   @inproceedings{dutta2021fully,
     title = {Fully Secure Unbounded Zero Inner Product Encryption with Short Ciphertexts and Keys},
     author = {Dutta, Ratna and Dutta, Subhranil and Pal, Tapas},
     booktitle = {International Conference on Provable Security (ProvSec)},
     year = {2021},
   }

2. ASIACRYPT

   (Compact) Adaptively Secure FE for Attribute-Weighted Sums from k-Lin

   Pratish Datta and Tapas Pal

   In International Conference on the Theory and Application of Cryptology and Information Security (ASIACRYPT), 2021

   Bib HTML

   @inproceedings{datta2021adaptively,
     title = {(Compact) Adaptively Secure FE for Attribute-Weighted Sums from k-Lin},
     author = {Datta, Pratish and Pal, Tapas},
     booktitle = {International Conference on the Theory and Application of Cryptology and Information Security (ASIACRYPT)},
     year = {2021},
   }

3. LATINCRYPT

   Attribute-Based Access Control for Inner Product Functional Encryption from LWE

   Ratna Dutta and Tapas Pal

   In International Conference on Cryptology and Information Security in Latin America (LATINCRYPT), 2021

   Bib HTML

   @inproceedings{dutta2021attribute,
     title = {Attribute-Based Access Control for Inner Product Functional Encryption from LWE},
     author = {Dutta, Ratna and Pal, Tapas},
     booktitle = {International Conference on Cryptology and Information Security in Latin America (LATINCRYPT)},
     year = {2021},
   }

4. ACISP

   Chosen Ciphertext Secure Functional Encryption from Constrained Witness PRF

   Ratna Dutta and Tapas Pal

   In Australasian Conference on Information Security and Privacy (ACISP), 2021

   Bib HTML

   @inproceedings{dutta2021chosen,
     title = {Chosen Ciphertext Secure Functional Encryption from Constrained Witness PRF},
     author = {Dutta, Ratna and Pal, Tapas},
     booktitle = {Australasian Conference on Information Security and Privacy (ACISP)},
     year = {2021},
   }

5. ACISP

   CCA Secure Attribute-Hiding Inner Product Encryption from Minimal Assumption

   Ratna Dutta and Tapas Pal

   In Australasian Conference on Information Security and Privacy (ACISP), 2021

   Bib HTML

   @inproceedings{dutta2021cca,
     title = {CCA Secure Attribute-Hiding Inner Product Encryption from Minimal Assumption},
     author = {Dutta, Ratna and Pal, Tapas},
     booktitle = {Australasian Conference on Information Security and Privacy (ACISP)},
     year = {2021},
   }

2020

1. CANS

   Chosen-Ciphertext Secure Multi-Identity and Multi-Attribute Pure FHE

   Ratna Dutta and Tapas Pal

   In International Conference on Cryptology and Network Security (CANS), 2020

   Bib HTML

   @inproceedings{dutta2020chosen,
     title = {Chosen-Ciphertext Secure Multi-Identity and Multi-Attribute Pure FHE},
     author = {Dutta, Ratna and Pal, Tapas},
     booktitle = {International Conference on Cryptology and Network Security (CANS)},
     year = {2020},
   }

2. ProvSec

   Semi-Adaptively Secure Offline Witness Encryption from Puncturable Witness PRF

   Ratna Dutta and Tapas Pal

   In International Conference on Provable Security (ProvSec), 2020

   Bib HTML

   @inproceedings{dutta2020semi,
     title = {Semi-Adaptively Secure Offline Witness Encryption from Puncturable Witness PRF},
     author = {Dutta, Ratna and Pal, Tapas},
     booktitle = {International Conference on Provable Security (ProvSec)},
     year = {2020},
   }

2019

1. ACISP

   Offline Witness Encryption from Witness PRF and Randomized Encoding in CRS Model

   Ratna Dutta and Tapas Pal

   In Australasian Conference on Information Security and Privacy (ACISP), 2019

   Bib HTML

   @inproceedings{dutta2019offline,
     title = {Offline Witness Encryption from Witness PRF and Randomized Encoding in CRS Model},
     author = {Dutta, Ratna and Pal, Tapas},
     booktitle = {Australasian Conference on Information Security and Privacy (ACISP)},
     year = {2019},
   }