Abstract: A system and method for preventing personal identity theft when making online and offline purchases requires a purchaser to first subscribe and become a member user by registering and providing relevant personal identity information. Once registered, the member is assigned a user name and a password. The subscribing member's personal identity information is then encrypted and stored at one or more highly secure locations. The ID protection system obtains a controlled use card (CUC) through a CUC issuer on behalf of the member for use to make each purchase transaction. The CUC is anonymous with respect to user (member) identity and may be a purchase-specific single-use card or a multiple-use stored value card with no traceable connection to any other financial account. When the member makes a secure online purchase, the system software enters anonymous information (i.e. not revealing the member's real name, email address, billing information, etc.