Authentication

Paper by M. Bishop, 1991. The author describes a technique, and a mechanism, to allow users to select passwords which to them are easy to remember but to others would be very difficult to guess. [Postscript]

An index of related resources. Includes software distributions and patches, as well as user documentation.

Freely available implementation of Kerberos 5. Includes system documentation and downloads.

Proof of concept. Tutorial using an image as the component "what you have".

OTP (S/Key) calculator for MacOS X, MacOS X Server and NEXTSTEP. RFC-2289 compliant. Software downloads, documentation and an introduction to the technology.

Providers of identity and access management software. The IAM Suite includes single sign-on, user provisioning, role management and directory synchronization.

Security feature that adds an extra layer of protection to a Dropbox account, by requiring a code from a cellphone or from any app that supports the Time-based One-Time Password (TOTP) protocol. Backup codes also available.