A Symmetric Key Based Deduplicatable Proof of Storage for Encrypted Data in Cloud Storage Environments

Algorithm 1

The key and index distribution algorithm.

: a hash value of a file , a master key of management server,

a data table of management server

: a secret key , the highest challenge , an index subset

(1) if then

(2)

(3)

(4)

(5) save (; , , ) in

(6) else

(7) load corresponding to from

(8) if then

(9)

(10)

(11) randomly choose

(12) return (, , )