Table 1 Notations
Symbol | Description |
|---|---|
\(\lambda\) | The security parameter |
\({\mathbb {G}}\), \({\mathbb {G}}_T\) | Bilinear multiplicative groups with prime order p |
\({\mathbb {Z}}_p\) | The group under multiplication modulo p |
\({\mathcal {T}}\) | An access tree of a certain access policy |
H | A hash function that is resistant to collusion attacks |
S | A set of attributes |
L | A set of leaf nodes |
V | A set of cooperation nodes |
\(\Delta\) | The Lagrange coefficient |
PK | The public key of system |
MSK | The master secret key of system |
SK | The secret key of a user |
CT | The ciphertext of a message |
\(Aai_{data}\) | The auxiliary authentication information of data |