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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