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First YubiKey USB token of the FIDO standard in 2014. The YubiKey is a hardware authentication device manufactured by Yubico to protect access to computers, networks, and online services that supports one-time passwords (OTP), public-key cryptography, authentication, and the Universal 2nd Factor (U2F) and FIDO2 protocols [1] developed by the FIDO Alliance.
Add an extra security step to sign into your account with 2-step verification. Find out how to turn on 2-step verification and receive a verification code, and how to turn off 2-step verification if you need to.
This visualisation of Wikipedia's coverage is based on a random pages test (User:Smallbones/1000 random results). Suppose you want to answer some broad question about Wikipedia. Is it any good? What subjects does it cover? In what proportions? Is there much vandalism? Finding a truly accurate answer would mean reading every article.
Seals showing Indus script, an ancient undeciphered writing system Page 32 of the Voynich manuscript, a medieval manuscript written with an undeciphered writing system. Many undeciphered writing systems exist today; most date back several thousand years, although some more modern examples do exist.