Abstract
We introduce the notion of approximate-deterministic public key encryption (A-DPKE), which extends the notion of deterministic public key encryption (DPKE) by allowing the encryption algorithm to be “slightly” randomized. However, a ciphertext convergence property is required for A-DPKE such that the ciphertexts of a message are gathering in a small metric space, while ciphertexts of different messages can be distinguished easily. Thus, A-DPKE maintains the convenience of DPKE in fast search and de-duplication on encrypted data, and encompasses new constructions. We present two simple constructions of A-DPKE, respectively from the learning parity with noise and the learning with errors assumptions.
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Acknowledgments
We are grateful to anonymous reviewers for their inspiring comments. Besides, we thank Yuanyuan Gao and Jingnan He for helpful discussions. Yamin Liu is supported by the National Natural Science Foundation of China (No. 61502480). Xianhui Lu is supported the by National Natural Science Foundation of China (No. 61572495, No. 61272534). Bao Li and Fuyang Fang are supported by the National Natural Science Foundation of China (No. 61379137) and the National Basic Research Program of China (973 project) (No. 2013CB338002).
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Liu, Y., Lu, X., Li, B., Jing, W., Fang, F. (2016). Approximate-Deterministic Public Key Encryption from Hard Learning Problems. In: Dunkelman, O., Sanadhya, S. (eds) Progress in Cryptology – INDOCRYPT 2016. INDOCRYPT 2016. Lecture Notes in Computer Science(), vol 10095. Springer, Cham. https://doi.org/10.1007/978-3-319-49890-4_2
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