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中文摘要：
用户撤销是基于身份的加密（IBE）方案在实际应用中所必须解决的问题。Chen等人在ACISP 2012上给出了第1个格上可撤销的基于身份的加密（RIBE）方案,但其只能达到选择性安全。利用Agrawal等人在欧密2010上给出的IBE方案,该文构造出一个格上适应性安全的RIBE方案,从而解决了Chen等人提出的公开问题;进一步指出利用Singh等人在SPACE 2012上给出的块方法,可以有效地缩短该方案的公钥尺寸。
英文摘要：
User revocation is crucial to the practical application of Identity Based Encryption（IBE）. The first Revocable Identity Based Encryption（RIBE） scheme from lattice is given by Chen et al. in ACISP 2012, but its security can only be proved in the selective-ID model. Using the IBE scheme suggested by Agrawal et al. in EUROCPYPT 2010, this paper constructs a lattice-based adaptive-ID secure RIBE scheme, so as to solve a problem left open by Chen et al.. This paper also points out that using the blocking technique given by Singh et al. in SPACE 2012, the public key size can be reduced effectively.
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