Building your firewall, Part 2

By Carole Fennelly, Unix Insider |  Security

Quite a few companies offer devices to generate one-time passwords. The theory is to combine something you know, such as a personal identification number, with something you have, such as a card. The SecurID card from Security Dynamics is one example.

S/Key

S/Key is a one-time password program that allows for single-use passwords. It is incorporated in several manufacturers' software packages as a cheap token. You can also download the source and incorporate it into your own programs.

Access control

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