Abstract: Disclosed are a key storage device and a method for using same, so as to improve security of storage and use of a key, and further improve the security of a process of identity verification. The key storage device comprises: a security module (11), configured to store a key, the key being used for verifying an identity of a user; an operational module (12), configured to generate identity verification information when identity verification needs to be performed, the identity verification information at least comprising processed seed information obtained after the seed information is processed by using the key stored in the security module, and the seed information being any information that can be processed by a computer system; and a key exchange module (13), configured to exchange the identity verification information with an external device.