Abstract: A method and system for authenticating goods and thereby detecting and deterring counterfeits are disclosed. According to one aspect of the invention, a client utilizes data received from a host to generate a plurality of security codes and to direct a printing device to print the plurality of security codes on a plurality of products, without retaining the plurality of security codes after the printing device has printed the plurality of security codes on the plurality of products. After the security codes have been printed, a person can communicate the security code to the host, which can verify its authenticity.

Abstract: Methods and systems for authenticating products are provided. A client system receives a request for a set of unique security codes and also receives product data associated with a product on which the security codes are to be printed. The client sends at least some of the product data to a host system and receives a batch identifier from the host. The host stores received product data with the batch identifier. The client generates the set of security codes and then provides the codes to be printed on the product. After the products enter the stream of commerce, the host can receive an authentication request including a security code, and in response the host will verify that the security code is valid and return to the requestor the authentication result and at least part of the product data associated with the batch identifier.