Abstract: The present invention provides for a data and access protection system for a computer via the use of a hardware key, comprising a non-volatile memory for storing a first access code, a hardware key having a second access code, means for determining whether the hardware key is connected to the computer and whether the first access code is different from the second access code, and means for disabling the computer when the hardware key is not connected to the computer or when the first access code is different from the second access code. Additional aspects of the present invention provide that the hardware key is capable of being carried on a key chain on a person and capable of starting a computer through wireless means. A further aspect of the present invention provides that the hardware key can be used to secure electronic transactions conducted over the Internet.