Two Ways of Deploying Two-Factor Authentication

Using two factors together does not always bring higher security.

Higher security is obtained when two factors are used in ‘multi-layer’ deployment at the sacrifice of convenience, while better convenience is obtained when two factors are used in ‘multi-entrance’ deployment at the sacrifice of security.

We must be careful not to mix up these two ways of deployments that have exactly the opposite security effects lest a serious false sense of security should be created and spread.

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