Table 7 Comparison of encryption modes.

From: Blockchain-based proxy re-encryption access control method for biological risk privacy protection of agricultural products

Encryption method

Ciphertext access control

Resistance to conspiracy attacks

Re-encrypt

Traceable

Xuan et al.

 × 

√

 × 

√

Youliang et al.

√

 × 

 × 

√

Feng et al.

√

√

 × 

√

Khan et al.

√

 × 

 × 

√

This study

√

√

√

√

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