The present invention generally relates to a computer security system for use in the identification and authentication of a user prior to an on-line transaction. In one aspect, a method for facilitating a secure transaction over a network is provided. The method includes collecting a username and password associated with a user of the machine. The method further includes verifying that the username and password matches a previously collected username and password in an identity profile. The method also includes collecting device data from a user machine to uniquely identify the machine. Additionally, the method includes verifying that the device data matches previously collected device data in the identity profile. In another aspect, a computer-readable medium including a set of instructions that when executed by a processor cause the processor to facilitate a secure transaction over a network is provided. In yet a further aspect, a system for facilitating a secure transaction is provided.