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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.
Learn about the history, variations and insecurity of the pigpen cipher, a geometric simple substitution cipher that uses symbols in a grid. The cipher is also known as the masonic cipher, Rosicrucian cipher, Napoleon cipher and tic-tac-toe cipher.
With Diffie–Hellman key exchange, two parties arrive at a common secret key, without passing the common secret key across the public channel. Diffie–Hellman ( DH ) key exchange [ nb 1 ] is a mathematical method of securely generating a symmetric cryptographic key over a public channel and was one of the first public-key protocols as ...
The web page lists the code names used by the U.S. Secret Service for presidents, first ladies, and other prominent persons and locations. Donald Trump and his family members have the code names Mogul, Muse, Mountaineer, Marvel, Marksman, and Mechanic.
Learn how keys are generated in cryptography and physical layer for encryption and decryption. Compare symmetric-key and public-key algorithms, random number generators, key exchange, and distributed key generation.
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.