CAJ | 학술논문

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。
용호철소시기우신빈적가밀(IBE)방안재실제응용중소필수해결적문제。Chen등인재ACISP 2012상급출료제1개격상가철소적기우신빈적가밀(RIBE)방안，단기지능체도선택성안전。이용Agrawal등인재구밀2010상급출적IBE방안，해문구조출일개격상괄응성안전적RIBE방안，종이해결료Chen등인제출적공개문제；진일보지출이용Singh등인재SPACE 2012상급출적괴방법，가이유효지축단해방안적공약척촌。
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 Chenet al. in ACISP 2012, but its security can only be proved in the selective-ID model. Using the IBE scheme suggested by Agrawalet al. in EUROCPYPT 2010, this paper constructs a lattice-based adaptive-ID secure RIBE scheme, so as to solve a problem left open by Chenet al.. This paper also points out that using the blocking technique given by Singhet al. in SPACE 2012, the public key size can be reduced effectively.