It would be desirable in network to implement an efficient asymmetric key cryptosystem which can not only solve the public key authentication problem but also integrate digital signature and key distribution, We propose two ID-based key distribution systems integrated with digital signature, and analyze them in computation and implementation. The first is based on the EIGamal-typed signature scheme, and the second is based on the RSA scheme, Both can be employed in one-pass and interactive key distribution systems.