Securing SSH with two factor authentication using Google Authenticator
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Two-step verification (also known as Two-factor authentication, abbreviated to TFA) is a process involving two stages to verify the identity of an entity trying to access services in a computer or in a network. This is a special case of a multi-factor authentication which might involve only one of the three authentication factors (a knowledge factor, a possession factor, and an inheritance factor) for both steps. If each step involves a different authentication factor then the two-step verification is additionally two-factor authentication.
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Google Authenticator implements TOTP security tokens from RFC6238 in mobile apps made by Google, sometimes branded “two-step authentication”. The Authenticator provides a six digit one-time password users must provide in addition to their username and password to log into Google services or other sites. The Authenticator can also generate codes for third party applications, such as password managers or file hosting services. Some versions of the software are open source. Full Story |
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