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(Inner-Product) Functional Encryption with Updatable Ciphertexts.

Valerio Cini1, Sebastian Ramacher2, Daniel Slamanig3

  • 1NTT Research, Sunnyvale, CA USA.

Journal of Cryptology : the Journal of the International Association for Cryptologic Research
|January 26, 2024
PubMed
Summary
This summary is machine-generated.

We introduce ciphertext-updatable functional encryption (CUFE), enabling dynamic access control for encrypted data. This novel approach allows ciphertexts to be updated securely using special tokens, expanding functional encryption

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Area of Science:

  • Cryptography
  • Computer Science
  • Information Security

Background:

  • Functional encryption (FE) provides powerful tools for secure data processing.
  • Existing FE schemes lack the ability to modify access policies after ciphertext generation.
  • Fine-grained access control is crucial for dynamic data management and security.

Purpose of the Study:

  • To introduce and define ciphertext-updatable functional encryption (CUFE).
  • To enable dynamic fine-grained access control for encrypted data.
  • To broaden the practical applications of functional encryption.

Main Methods:

  • Defined a new primitive, CUFE, with a security notion in the indistinguishability setting.
  • Introduced tag-based matching for functional decryption keys and ciphertexts.
  • Developed update tokens for controlled ciphertext tag switching.
  • Presented a generic construction of CUFE relying on indistinguishability obfuscation (iO).
  • Provided a practical CUFE construction for inner-product functionality based on the LWE assumption in the random-oracle model.

Main Results:

  • Successfully defined and constructed CUFE, a novel variant of functional encryption.
  • Demonstrated a generic construction for arbitrary functionalities and tag predicates.
  • Achieved a practical construction for inner-product functionality with ciphertext updatability.
  • Addressed security challenges, particularly concerning updated challenge ciphertexts.

Conclusions:

  • CUFE significantly enhances functional encryption by enabling ciphertext updates.
  • The proposed constructions offer practical solutions for dynamic access control in encrypted data.
  • This work enriches the landscape of functional encryption schemes with updatability features.