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Robust 2-Channel Authentication


2 is larger than 1, but not necessarily stronger than 1.
https://www.theregister.com/2020/07/20/twitter_security_update_hackers_broke_2fa/

By bringing in the concept of Expanded Password System, we are able to protect important accounts more reliably than conventional 2-factor/step authentications as outlined here – “Advanced Persistent Threats in Digital Identity” https://www.linkedin.com/pulse/advanced-persistent-threats-digital-identity-hitoshi-kokumai/

This is not a hypothesis. It has been quietly but effectively deployed since 2014 for a security-centric corporate network by 1,200 employees. 

Needless to say, asymmetric cryptography could be additionally incorporated for yet higher security where needed.

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