A system, method and computer program product protects client information used for online transactions by storing transaction details on the client side of a network and avoiding storage on the host side. A hash function may be generated representing a transaction and its details on both the client and server sides. For the transaction to be processed, the hash function from the client side must match the hash function on the host side. Once authenticated, the transaction details may be read and processed while maintaining storage of the client information on the client side of the network.