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Hardware authentication security keys. Multi-factor authentication (MFA; two-factor authentication, or 2FA, along with similar terms) is an electronic authentication method in which a user is granted access to a website or application only after successfully presenting two or more pieces of evidence (or factors) to an authentication mechanism.
An example of a physical security measure: a metal lock on the back of a personal computer to prevent hardware tampering. Computer security (also cybersecurity, digital security, or information technology (IT) security) is the protection of computer software, systems and networks from threats that can lead to unauthorized information disclosure, theft or damage to hardware, software, or data ...
[2] [3] User public keys are certified by the Skype server at login with 1536-bit or 2048-bit RSA certificates. Skype's encryption is inherent in the Skype Protocol and is transparent to callers. Some private conversations through Skype such as audio calls, text messages, and file sending (image, audio, or video) can make use of end-to-end ...