Abstract
Proxy re-encryption (PRE) can share ciphertext data without leaking the decryption key of the data owner in cloud computing. Because of the special property, PRE achieves good reliability and secrecy. Nevertheless, most of the proposed proxy re-encryption schemes are based on the number theoretic problem and cannot resist quantum attacks. In addition, most existing researches over lattice focus on the single bit encryption, which leads to low efficiency. Therefore, according to these problems, an efficient identity-based multi-bit proxy re-encryption over lattice in the standard model is constructed, which enlarges the plaintext space and improves the efficiency. What's more, the proposed multi-use and bidirectional scheme is proved to be CPA secure in the standard model.
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