Security authentication method and system based on computer

The invention belongs to the technical field of information security, and discloses a security authentication method and system based on a computer. The security authentication system based on the computer comprises a computer information acquisition module, an authentication information preprocessing module, an authentication information communication module, a central control module, a security level acquisition module, a security authentication module, an authentication evaluation module, a data channel security control module, a data storage module and an update display module. According to the invention, the authentication information preprocessing module detects whether computer data information can complete a read-write request in a computer data information redundancy processing, and recovers the computer data information, so that the integrity of the whole computer data information redundancy processing is better; a security authentication strategy corresponding to the security level is executed thro