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A transaction authentication number (TAN) is a one-time password used by some online banking services to authorize financial transactions. TANs provide additional security as a form of two-factor authentication, but are still vulnerable to phishing, man-in-the-middle and malware attacks.
Multi-factor authentication (MFA) is an electronic authentication method that requires users to present two or more pieces of evidence to access a website or application. MFA protects personal data from unauthorized access and uses factors such as something the user has, knows, or is.
Learn how basic access authentication works in HTTP transactions, where a user agent provides a user name and password in a header field. Find out the features, security, and protocol of this method, and its alternatives and references.
Learn how to turn off 2-step verification and receive a verification code to sign into your AOL account. You can use phone verification or authenticator app verification to add an extra security step.
Learn what a message authentication code (MAC) is, how it works, and why it is used for authenticating and integrity-checking messages. Compare MAC with cryptographic hash functions, digital signatures, and other cryptographic primitives.
Learn how digest access authentication works, its advantages and disadvantages, and its history and standards. Digest access authentication is a method of verifying user identity with a web server using MD5 or SHA hashing and nonce values.
A one-time password (OTP) is a password that is valid for only one login session or transaction, on a computer system or other digital device. OTPs avoid several shortcomings that are associated with traditional (static) password-based authentication and can be generated using different algorithms and methods.
A transponder code is a four-digit code used by aircraft to identify themselves to air traffic control. This list shows the codes used in various countries and situations, such as emergency, VFR, IFR, and oceanic airspace.
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