Gtech Corporation

Chenghui Luo

Thomas K Oram

Johan Berg

Credit vouchers from a wagering game machine can be authenticated. This may be accomplished by receiving credit information at a server, the credit information including information indicating a player's balance at the wagering game machine. A security key may be created for the credit voucher. A secured document token may be created by encrypting a document token including the credit information with the security key. This document token may sent to a server which supplies a credit response. A modified security key may be created by combining the credit response with the security key. The credit voucher may be provided, the credit vouchers including the credit information, the credit response and the modified security key.

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East Greenwich, RI, United States of America

Chenghui Luo