［1］Goyal V, Pandey O, Sahai A, et al． Attributebased encryption for finegrained access control of encrypted data［C］∥Proc of CCS’06, 2006:8998．
［2］Sahai A, Waters B. Fuzzy identitybased encryption［C］∥Proc of Advances in CryptologyEUROCRYPT，2005:457473．
［3］Bethencourt J，Sahai A，Waters B． Ciphertextpolicy attributebased encryption［C］∥Proc of the 28th IEEE Symposium on Security and Privacy，2007:321334．
［4］Cheung L,Newport C.Provably secure ciphertext policy ABE［C］∥Proc of the 14th ACM Conference on Computer and Communications Security( ACMCCS), 2007:456465．
［5］Goyal V, Jain A, Pandey O, et al. Bounded ciphertext policy attributebased encryption［C］∥Proc of the 35th International Colloquium on Automata, Languages and Programming, Part II,2008:579591.
［6］Bethencourt J, Sahai A, Waters B. Ciphertextpolicy attributebased encryption［C］∥Proc of IEEE Symposium on Security and Privacy, 2007:321334.
［7］Pirretti M， Traynor P， McDaniel P， et al． Secure attribute based systems［C］∥Proc of the 13th ACM Conference on Computer and Communications Security, 2006:99112．
［8］Ostrovsky R, Sahai A, Waters B． Attribute based encryption with nonmonotonic access structures［C］∥ACM Conference on Computer and Communications Security ( ACM CCS), 2007：1．
［9］Lee B, Kim K. Fair exchange of digital signatures using conditional signature［C］∥Proc of the 2002 Symposium on Cryptography and Information Security(SCIS’02), 2002:179184.
［10］Berta I Z, Buttyn L, Vajda I.  Migrating the untrusted terminal problem using conditional signatures［C］∥Proc of International Conference on Information Technology:Coding and Computing(ITCC’04), 2004:1216.
［11］Klonowski M, Kutylowski M, Lauks A,et al. Conditional digital signatures［C］∥Proc of the 2nd International Conference on Trust Bus,2005:206215.