A METHOD FOR SECURED DATA SHARING IN AN UNTRUSTED CLOUD STORAGE

The method for secured data sharing in an un trusted cloud storage comprises providing any user of a specific community with a public key for each group member as a password; allowing generation/deletion of data and addition/deletion of new customer data in a community impact the users without any external structures and tackling problem of revocation of users thoroughly with a highly safe, fine-grained access mechanism; employing an encryption method to promote protected information sharing on many servers which are not trusted ones; splitting complete file into file groups and encoding specific file block keys of each file section by the data owner; generating a significant file transfer overhead thereby changing and distributing the file block key to delete the costumer again; and offering a secure way to connect the data with active cloud customers and maximum degree of protection by issuing a special secret key to each person. S E --N 0. > ~ -2 .2 co 0 I -0 C.) m ) uc CU C 0 L - E cu -u 14- a) E 20 Lm 0 R) . E E -C 4 cu i- w0 CU cu t cu -c E ) CU -E -0 0C 0- 0 4-. 40$ c~n 0 M 0 EI ' L p CO W 0u >- $-. -0 tw .2E -Ne~ ~~ j -C Co ~ C ~ L m 0)~ u -00c a) 0 CU4 CU tw U - co 0 -i 0 4.C . 4 -- EL '' C 0 CC 0f $- -ET c ac -N 4511 0 1 a 00 CU >L W _0 (A4(Ln4 2 : 4-- 4U 0 u 0o o 00 . ,4 _: -u -C. 19 *9C- 0 Cu 0 -0 CU CU 0) CU _ U 4 _0 :E E L - C 4- U 0o 0 o C:A 0.C M )0 L- U0 ) L.0 > Cu CL >. 0)(A C a) CM 0 0 0) o 0) 2L C2 = 0 %. 0) 0)