US Patent 7209029 Electronic lock system and method for providing access thereto

A method for providing a security code comprises providing an access location identification and security device information. A user provides access location information and access duration information to a code generator system. The access location information and access duration information is encrypted to provide an access code. The user provides a user token data to the code generator system, such that the access code is encrypted using the user token data to provide a security code. The security code is dispatched to the user.