【Key words】 provable security； public-key encryption； hybrid encryption of asymmetric and symmetric encryptions； chosen ciphertext security；
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The scheme has adaptively chosen ciphertext security in the random oracle model.
并在随机谕示模型下，证明了方案具有选择密文安全性。
Its (security) is based on the intractability of the integer factorization problem as RSA, and it is able to resist the chosen-ciphertext attack against RSA and easy to be implemented.
它与RSA算法相似，其安全性基于大数因式分解的难度，能够抵抗对于RSA的选择密文攻击，并且易于软件实现。
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