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Learn how to generate strong and secure passwords using software, hardware, or manual methods. Compare different sources of randomness, password types, and entropy calculations.
A time-based one-time password (TOTP) is a code that changes every few seconds based on the current time. It is used for two-factor authentication (2FA) and is part of the OATH standard.
Google Authenticator is a software app that generates one-time passwords for multi-factor authentication. It uses a shared secret key provided by the service provider and a time-based or counter-based algorithm to calculate the password.
Learn how to generate and use an app password to access your AOL Mail account on third-party email apps that do not use the AOL Mail sign-in page. App passwords are randomly generated codes that remain active even if you change your main account password.
Learn about the process and methods of generating random numbers or symbols that cannot be reasonably predicted better than by random chance. Compare true random number generators (RNGs) and pseudorandom number generators (PRNGs) and their applications in various fields.
QR code is a type of two-dimensional barcode invented in 1994 by a Japanese company for labelling automobile parts. It can store data for various purposes, such as web tracking, product identification, and mobile tagging, and can be scanned by imaging devices like cameras.
Learn about the invention, development and applications of barcodes, a method of representing data in a visual, machine-readable form. Find out how barcodes evolved from linear to 2D, and how they are used in supermarkets, railroads and other industries.
A CSPRNG is a PRNG with properties that make it suitable for use in cryptography. It can stretch the available entropy over more bits and resist state compromise attacks. Learn about its background, definitions and designs based on cryptographic primitives or mathematical problems.