ABSTRACT
Fixed passwords are no longer appropriate for controlling computer access. Effective access control calls
for the use of dynamic passwords, which are generated by tokens, a calculator-type device. Many such
devices have now been introduced into the marketplace, but no one is necessarily appropriate for all
situations. This chapter discusses the use of dynamic passwords and describes the characteristics of
currently available password generators and their advantages and disadvantages in particular situations.
A table comparing the features of a selected group of tokens is included.
