The invention provides a security
verification system based on distributed network transaction and relates to the field of network
transaction security of financial institutions. The security
verification system is in remote connection with a
payment terminal device of a user and comprises a token generation subsystem, a token management subsystem and a token
verification subsystem. The token generation subsystem is used for generating encrypted tokens, and information of each token comprises a serial number, a token key and a digital activation code. The token management subsystem is used for managing token issuing, toke loss reporting or token destroying. The token verification subsystem is used for verifying the
payment terminal device of the user. The three subsystems are disposed in a distributed manner, the three subsystems are provided with a same transmission main key inside,
remote communication is applied among the different subsystems, and information of the communicated token each time is re-encrypted. By the security
verification system, operations such as signature by theft on
certificate storage medium by computer Trojan online can be prevented effectively, and security of an online transaction
system is guaranteed. In addition, by the use of the
distributed structure, expandability is high, and manpower and
material resources costs are reduced.