A Novel User Collusion-Resistant Decentralized Multi-Authority Attribute-Based Encryption Scheme Using the Deposit on a Blockchain

Table 2

Computational cost.

Phase	Entity	Operation	Cost
Phase 1 (deposit setup)	CA
	User	Randomly choose; Compute; Send Tx to SC (deposit)
Phase 2 (get ciphertext)	Seller	Randomly choose; Compute; Generate signature
	Buyer	Send Tx to TSC (deposit)
	CSP	Compute
Phase 3 (state transition: Update)	CA	—	—
	User	Randomly choose; Compute; Send Tx to SC (update)