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Advances, Systems and Applications

Table 1 Important notations

From: An efficient and secure data sharing scheme for mobile devices in cloud computing

Notation

Meaning

λ

Security parameter

A

Attribute universe

\( {\mathbbm{G}}_1,{\mathbbm{G}}_2 \)

Multiplicative groups

q

Prime order of group

sigg

Algebra signature

PK,  MK

Public and master keys

S

Attribute of DR

SK

Private key of DR

F, F′

Plain text of file and encrypted file

Ti

Block tag

DP, TP

Data proof and tag proof

AS

Access policy

mi

Data block

Uid

Identity of user

Usk, Upk

Private and public key of user