Key-Insulated Undetachable Digital Signature Scheme and Solution for Secure Mobile Agents in Electronic Commerce

Table 2

Comparisons of undetachable digital signature schemes.

Scheme	Extra security feature	Formal proof of security	Computational infeasible problem
[3]	No	No	Factorization of big integer
[4]	Bilateral security	No	Factorization of big integer
[5]	No	No	-Strong Diffie–Hellman problem
[6]	Threshold security	No	Factorization of big integer
[7]	No	No	Discrete logarithm on elliptic curves
[8]	No	No	Computational co-Diffie–Hellman problem
[9]	Threshold security	No	Discrete logarithm on conic curves
[10]	Forward-secure	Yes	Computational co-Diffie–Hellman problem
This work	Key-insulated	Yes	Computational Diffie–Hellman problem