Abstract
Proxy re-encryption (PRE) allows the proxy to translate a ciphertext encrypted under Alice’s public key into another ciphertext that can be decrypted by Bob’s secret key. Identity-based proxy re-encryption (IB-PRE) is the development of identity-based encryption and proxy re-encryption, where ciphertexts are transformed from one identity to another. In this paper, we propose two novel unidirectional identity-based proxy re-encryption schemes, which are both non-interactive and proved secure in the standard model. The first scheme is a single-hop IB-PRE scheme and has master secret security, allows the encryptor to decide whether the ciphertext can be re-encrypted. The second scheme is a multi-hop IB-PRE scheme which allows the ciphertext re-encrypted multiple times but without the size of ciphertext growing linearly as previous multi-hop IB-PRE schemes.
Supported by National Natural Science Foundation of China (No.60873238, 61073156, 60970135, 60821003, 61170263).
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Luo, S., Shen, Q., Chen, Z. (2012). Fully Secure Unidirectional Identity-Based Proxy Re-encryption. In: Kim, H. (eds) Information Security and Cryptology - ICISC 2011. ICISC 2011. Lecture Notes in Computer Science, vol 7259. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31912-9_8
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