CoreStreet Awarded 15th Patent for Its Distributed Validation Technology; Newest Patent Bolsters CoreStreet's Portfolio of Certificate Validation Intellectual Property.

CAMBRIDGE, Mass. -- CoreStreet, a leading provider of validation solutions for identity management and access control, today announced that the U.S. Trademark and Patent Office has issued CoreStreet's latest patent, number 6,766,450, for its Certificate Revocation System. This patent covers technology that enables the validation of credentials across a distributed infrastructure. This is the 15th in a series of CoreStreet patents, most of which are based on the work of renowned MIT Professor, and CoreStreet co-founder, Dr. Silvio Micali.

"Our 15th patent reaffirms CoreStreet's position as the only software company to provide massively scalable, cost-effective and secure solutions for credential validation," said Phil Libin, president of CoreStreet. "Dr. Silvio Micali, the company's chief scientist, and our outstanding team of engineers are committed to developing the technology that will drive the next generation of validation solutions."

Market experience has shown that first-generation approaches to managing certificates in a Public Key Infrastructure (PKI) system are both costly and cumbersome. The technology patented by CoreStreet greatly reduces the cost and complexity of implementing PKI by eliminating the need for users to query heavyweight, trusted servers or network resources. The distributed validation approach is more proactive in that it involves digitally signing individual pieces of information about any public key certificate, then distributing and storing that information on unprotected, local responders. This dramatically reduces the cost and risk of managing public key certificates and is fully compatible with existing standards, such as OCSP and .X509.

CoreStreet's Real Time Credentials(TM) provide secure distributed validation of digital certificates without sacrificing performance, availability or security. The company's products enable government agencies, financial services companies and the Global 1000 to conduct scalable and secure certificate validation in connected or disconnected environments.

CoreStreet owns the full rights for patents covering its validation technology and other certificate validation technologies and processes, and patents in the complementary area of efficient certificate issuance.

This patent was awarded on July 20, 2004, covering technology developed in the mid-90s.

About CoreStreet

CoreStreet is the only provider of massively scalable validation products for identity management and access control. With CoreStreet's Real Time Credentials(TM), organizations can control physical and logical access to buildings, computer networks, applications and devices. Real Time Credentials solutions can be deployed anywhere in the world - in connected and disconnected environments - without having to set up costly and vulnerable infrastructure. CoreStreet's products are designed to secure large, mission-critical applications for military, civilian government, financial services and healthcare customers. The company, headquartered in Cambridge, Mass., holds 15 patents with more pending. For more information, visit www.CoreStreet.com.