Tivoli is known to most IT people for its Tivoli distributed system management system. The product, Tivoli SecureWay Public Key Infrastructure software, provides both certificate and signature features, and supports the Identrus standard for e-business security.
Most analysts see digital signatures as a vital part of any widescale adoption of e-commerce.
That's difficult to manage electronically. Thus the importance of products like this one, which provides a uniquely encrypted identifier that e-commerce participants can use to identify one another.