Blockchain as a CA: A Provably Secure Signcryption Scheme Leveraging Blockchains

Table 1

Notations of the proposed scheme.

Symbol	Description
	Global security parameter
	Elliptic curve global parameters
	One-way hash function
	Sender Alice’s private/public key pairs and pseudo name
	Recipient Bob’s private/public key pairs and pseudo name
	Data sent from sender to recipient
	Public part of
	Sensitive part of
	ECDSA signature
	Ciphertext
	Transaction
A	System definition