Information, Computer and Network Security Terms Glossary and Dictionary

OTP: One Time Password

A one-time password authentication system (OTP) provides authentication for system access (login) that is secure against passive attacks based on replaying captured reusable passwords. OTP system can generate password randomly or based on some rules. Once one of the passwords is used, it cannot be used again. The logon system will always expect a new one-time password at the next logon. Smart cards and token-based authentication methods use one-time passwords.

Related Terms

OTP: One Time Password