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Role-based identities are central to understanding how individuals navigate social environments by adopting distinct self-conceptions aligned with various societal roles. These identities are not fixed traits but are constructed through personal actions and the social feedback individuals receive in context-specific interactions. Each social role, such as student, teacher, or friend, carries a set of expectations and norms that influence how people think, feel, and behave within that...
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Post-Quantum Secure Lightweight Revocable IBE with Decryption Key Exposure Resistance.

Dandan Zhang1, Hongwei Ju2, Zixuan Yan1

  • 1School of Computer Science, Qufu Normal University, Rizhao 276800, China.

Entropy (Basel, Switzerland)
|November 26, 2025
PubMed
Summary

This study introduces a new method for Revocable Identity-Based Encryption (RIBE) with decryption key exposure resistance (DKER). The proposed scheme significantly reduces computational and communication overhead by generating only one ciphertext per message.

Keywords:
decryption key exposure resistancelatticelightweightpost-quantum securerevocable identity-based encryption

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Area of Science:

  • Cryptography and Information Security
  • Computer Science

Background:

  • Revocable Identity-Based Encryption (RIBE) provides backward security by allowing dynamic revocation of compromised user keys.
  • Existing RIBE schemes with Decryption Key Exposure Resistance (DKER) suffer from high ciphertext redundancy, leading to significant computational and communication burdens.
  • Current schemes generate O(rlog(N/r)) ciphertexts per message, necessitating a more efficient approach.

Purpose of the Study:

  • To propose a novel dual-key combination trapdoor generation method to enhance RIBE efficiency.
  • To construct an indirect RIBE scheme with DKER that reduces ciphertext redundancy and improves performance.
  • To develop a Post-Quantum Secure, Lightweight RIBE scheme with DKER (PQS-LRIBE-DKER).

Main Methods:

  • Introduced a dual-key combination trapdoor generation mechanism using Inhomogeneous Small Integer Solution (ISIS) instances.
  • Users derive re-randomized decryption keys by combining identity and time keys, enabling controlled key derivation and indirect revocation.
  • Constructed the PQS-LRIBE-DKER scheme, leveraging identity and time keys as user secret keys and updates, respectively.

Main Results:

  • The proposed indirect revocation method reduces ciphertext redundancy to a single ciphertext per plaintext message.
  • Achieved significant reductions in sender's computational load and system's communication overhead compared to existing schemes.
  • The PQS-LRIBE-DKER scheme is proven secure under the hardness assumptions of Learning with Errors (LWE) and ISIS problems in the standard model.

Conclusions:

  • The novel dual-key combination trapdoor generation method effectively addresses the efficiency limitations of existing RIBE with DKER schemes.
  • The developed PQS-LRIBE-DKER scheme offers a practical and efficient solution for secure data sharing in dynamic environments.
  • The scheme provides post-quantum security and lightweight properties, making it suitable for modern cryptographic applications.