Notation | Description |
| Group’s ID |
| Group public key and master key |
| Group public key component for attribute a |
| Group master key component for attribute a |
| The access structure of user |
| Attributes associated with leaf nodes of pol |
| Secret key of the user |
| User secret key component for attribute a |
| Group attributes set |
| File attributes set |
| Group attribute history list for attribute a |
| File’s ID |
| The virtual attribute |
| Ciphertext and the ciphertext component for attribute a |
| Symmetric data encryption key of a data file |
| Group user list |
| Signature of data owner on message m |
| Proxy re-encryption key the current attribute a to the updated version a’ |
| The system users list |