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Backward Compatible Identity-Based Encryption.

Jongkil Kim1

  • 1Department of Cyber Security, Ewha Womans University, Seoul 03760, Republic of Korea.

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Summary
This summary is machine-generated.

We introduce Backward Compatible Identity-based Encryption (BC-IBE), a novel system ensuring users can access all past encrypted data. This solves synchronization issues in revocable encryption, simplifying key management for dynamic systems like IoT.

Keywords:
IoT network securitycloud securityidentity-based encryptionpublic key encryptionrevocation

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Area of Science:

  • Cryptography
  • Information Security
  • Computer Science

Background:

  • Revocable encryption systems (IBE, ABE) face synchronization issues between user keys and ciphertexts.
  • Updating private keys for revocation can lead to loss of access to past encrypted data.
  • Existing schemes struggle with maintaining access to historical data after key updates.

Purpose of the Study:

  • To propose a new identity-based encryption (IBE) system named Backward Compatible Identity-based Encryption (BC-IBE).
  • To address the problem of out-of-synchronization between users' private keys and ciphertexts in revocable encryption.
  • To ensure users retain access to all past ciphertexts even after key updates.

Main Methods:

  • Development of a novel BC-IBE construction.
  • Periodic updates of user private keys and ciphertexts with time tags for revocation.
  • Formal security proof for the proposed BC-IBE scheme.

Main Results:

  • BC-IBE enables newly issued private keys to decrypt both current and all past ciphertexts.
  • The system supports user revocation without compromising access to historical data.
  • Ciphertext updates can be delegated to third-party servers without requiring decryption, enhancing security.

Conclusions:

  • BC-IBE simplifies key management and securely delegates ciphertext updates compared to existing revocable IBE systems.
  • The scheme guarantees decryption of all encrypted data, ensuring synchronization.
  • BC-IBE is well-suited for dynamic environments like IoT and cloud data storage with regular data updates.