A Fine-Grained Medical Data Sharing Scheme with Ciphertext Reencryption

Table 2

System function comparison of different schemes.

Scheme	[28]	[24]	[23]	[20]	[19]	Ours
Support ciphertext conversion	×	√	√	√	√	√
Collusion resistant	√	√	√	√	√	√
Decryption outsourcing	√	√	√	×	×	√
No KGC	√	×	×	×	×	√
User revocation	√	×	×	√	√	√
Decryption verification	×	√	×	×	×	√