4Yun A, Shi C, Kim Y. On protecting integrity and confidentiality of cryptographic file system for outsourced storage [C] //Proc of ACM Workshop Cloud Computing Security (CCSW 2009). New York: ACM, 2009:67-76.
6Vrable M, Savage S, Voelker G M. Cumulus: Filesystem Backup to the cloud [J]. ACM Trans on Storage, 2009, 5 (4): 1-28.
7Cramer R, Shoup V. Design and analysis of practical public- key eneryption schemes secure against adaptive chosen ciphertext attack [J]. SIAM Journal on Computing, 2004, 33(1) : 167-226.
8Hofheinz D, Eike K. Secure hybrid encryption from weakened key encapsulation [G] //LNCS 4622: Proc of CRYPTO 2007. Berlin: Springer,2007: 553-571.
9Blaze M, Bleumer G, Strauss M. Divertible protocols and atomic proxy cryptography [G] //LNCS 1403: Proc of EUROCRYPT 1998. Berlin.. Springer, 1998:127-144.
10Ateniese G, Fu K, Green M, et al. Improved proxy re- encryption schemes with applications to secure distributed storage [J]. ACM Trans on Information and System Security, 2006, 9(1): 1-30.