Westpac New Zealand Leads the Way to Deliver Triple DES Security with ACI Worldwide Payments Software

New Zealand's Largest Full Service Bank Brand Upgrades Software from ACI Across Entire ATM Network

(Omaha, NE. - August 12, 2004) - ACI Worldwide (Nasdaq: TSAI), a leading international provider of enterprise e-payment solutions, today announced that the Westpac Banking Corporation (New Zealand division) has successfully completed an upgrade of its BASE24(r) application software. For more than 15 years, BASE24 has driven the front end processing for all Westpac ATM network transactions. The upgrade will help Westpac's network of nearly 500 ATMs more efficiently process approximately 250 million transactions per year while keeping the bank a step ahead of industry mandates.

A key component of the upgrade was the implementation of the enhanced services architecture of ACI's Transaction Security Services. The Transaction Security Services module is designed to manage all cryptographic functions such as PIN verification and chip authentication. The deployment will help enable Westpac's ATM network for Triple DES compliance as international card issuers continue the push toward the Triple DES security standard. These issuers have mandated banks and financial institutions worldwide to introduce Triple DES to eliminate ATM security concerns.

"ACI and Westpac worked together to make the upgrade a success," said Ross
Hughson, Westpac New Zealand's chief information officer. "Westpac is committed to ensuring our customers' ATM transactions are secure. This upgrade ensures we continue to deliver a trustworthy service and positions us to implement further enhancements required by our customers and the industry."

"ACI is delighted to recognize Westpac New Zealand as the first organization in Asia/Pacific to complete both an upgrade of BASE24 and an implementation of Transaction Security Services," said Don McLarty, ACI's managing director of Asia/Pacific operations. "Using ACI software, Westpac can deploy Triple DES quickly and integrate it seamlessly with their existing BASE24 infrastructure."

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