A one-time password (OTP) is a password that is valid for only one login session or transaction. OTPs avoid a number of shortcomings that are associated with traditional (static) passwords. The most important shortcoming that is addressed by OTPs is that, in contrast to static passwords, they are not vulnerable to replay attacks. This means that a...
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http://en.wikipedia.org/wiki/One-time_password
In network security, a password issued only once as a result of a challenge-response authentication process. Cannot be 'stolen' or reused for unauthorized access.
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http://www.encyclo.co.uk/visitor-contributions.php
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