ZHOU Dehua, CHEN Kefei, LIU Shengli, ZHENG Dong. Identity-Based Conditional Proxy Re-Encryption[J]. Chinese Journal of Electronics, 2013, 22(1): 61-66.
Citation: ZHOU Dehua, CHEN Kefei, LIU Shengli, ZHENG Dong. Identity-Based Conditional Proxy Re-Encryption[J]. Chinese Journal of Electronics, 2013, 22(1): 61-66.

Identity-Based Conditional Proxy Re-Encryption

Funds:  This work is supported by the National Natural Science Foundation of China (No.61133014, No.61070249, No.61005049, No.60903178, No.60970111), the Fundamental Research Funds for the Central Universities (No.21612335), the Research Fund for the Doctoral Program of Higher Education of China (No.20100073110060), the Innovation Project (No.12ZZ021) of Shanghai Municipal Education Commission.
  • Received Date: 2010-12-01
  • Rev Recd Date: 2012-04-01
  • Publish Date: 2013-01-05
  • In a Idendity-based proxy re-encryption (IBPRE) scheme, a proxy, converts a ciphertext for one identity into a ciphertext for another identity without knowing the underlying plaintext. IBPRE can be used for applications requiring delegation, such as delegated email processing. However, some scenarios require handle a fine-grained delegation. For example, the delegator wants to limit the proxy to only re-encrypt the encrypted emails associated with specific conditions. To overcome the limitation of existing IBPRE, we introduce the notion of Identity-based conditional proxy re-encryption (IBCPRE), whereby only ciphertext satisfying one condition set by delegator can be transformed by the proxy and then can be decrypted by delegatee. We further proposed a concrete IBCPRE scheme, and prove its security in the standard model.
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