Public key infrastructure is poised for a resurgence, with associated identity technologies increasingly underpinning applications as organizations look to securely share information, vendors said Tuesday at a standards conference in London.

While it was a hot buzzword during the peak of the technology boom, PKI fell out of favor as IT projects were increasingly seen as bloated and without sufficient focus.

"PKI still has a lot of perception problems," said Stijn Bijnens, senior vice president of identity management for Cybertrust.

Bijnens was one of several participants in a conference by the Organization for the Advancement of Structured Information Standards (Oasis), a consortium that developments standards for business applications.

PKI uses certificates that have been verified by a certification authority and allows other organizations or people to exchange trusted information. PKI simplifies e-government and e-commerce by letting a person identify themselves once to a certification authority that vouches for the person's identity when they interact with other organizations in the infrastructure.

Several changes in IT should spur growth of PKI. Microsoft's release of its next-generation operating system, Windows Vista, contains technology to help users manage identities, called CardSpace, Bijnens said. CardSpace will allow users going to compatible Web sites to have greater control over how their personal information is released.

While it's unknown how CardSpace will work with other identity technologies, it should help grow the market for certificate accreditation and procedures around identity verification, Bijnens said.

"Microsoft just enables the market for everyone," Bijnens said.

Governments are undertaking electronic-identity projects that should also foster interest in PKI technology, Bijnens said.

But PKI technology faces hurdles, too. The technology is growing increasingly complex even for those familiar with it, said Arshad Noor, of StrongAuth.

Noor said he was once involved with a PKI implementation at one of the largest pharmaceutical companies for its 120,000 employees worldwide. The CEO expected the rollout could be done in about five weeks. The rollout eventually finished, but not on the CEO's time scale, he said.

The IDG News Service is a Network World affiliate.