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A system for artificially dissipating fog, in which gasoline or other fuel is burned at intervals along an airstrip to be cleared. Derived from fog investigation dispersal operations.
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FInite DOmains. A constraint language implemented on top of Prolog.
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(1) See FidoNet.

(2) (Fast IDentity Online) A technology from the FIDO Alliance that authenticates a user logging into an online service. In 2014, the Alliance introduced biometric and two-factor authentication methods.

Client and Server Interaction
When a user opens an account with an online service, the FIDO client in the user's app or browser registers with the FIDO counterpart in the provider's server. The FIDO client is used to select the authentication method (biometric or second factor), enroll the user and generate a private/public key pair. It keeps the private key in the user's device and sends the public key to the FIDO server. See public key cryptography.

When logging in, the FIDO client performs the biometric or second factor verification and then receives a challenge from the server. The client digitally signs the challenge, which the server verifies using the public key stored in the user's account. See digital signature.

FIDO UAF (Universal Authentication Framework)
The UAF is the biometric authentication protocol used by the FIDO client.

FIDO U2F (Universal Second Factor)
The U2F supports a second authentication device such as a USB security key or PIN. See two-factor authentication.

FIDO2 is the latest generation. FIDO2 uses the W3C's Web Authentication specification (WebAuthn), built into major browsers such as Chrome and Edge, and FIDO's client-to-authentication protocol (CTAP), which enables smartphones and USB security keys to work as FIDO authenticators.

A FIDO-Certified USB Key
This YubiKey FIPS is certified for FIDO second-factor authentication, and it meets federal standards (see FIPS 140-2). (Image courtesy of Yubico,
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References in periodicals archive ?
But few potential buyers are aware of the improvement in the market in FiDi, Berzak and McDonough lamented.
FIDI is the largest global network of independent quality international removal companies comprising of over 500 members in more than 100 countries - all of which are committed to a definitive quality standard.
In addition Fidi is directly responsible for the attack on the gas station at Ariel on October 2002 in which three were killed and 17 were injured.
Getting to know the New Yorkers who call the FiDi home [NYDN]
To become a FIDI-FAIM mover, members of FIDI (International Federation of International Furniture Removers) alliance have to go through a stringent audit conducted independently by Cap Gemini, the statement added.
Harsch Transports has maintained this certification for more than six years, and today, it is obligatory for all FIDI movers to have this certification.
As a professional mover the company are proud of their reputation built on quality and are members of the British Association of Removers and their Overseas Moving Group as well as being accredited to FIDI FAIM and ISO 9001:2008 Quality Standards.
And the vacancy rate for FiDi rentals is lower than Manhattan's average [Post]
However, there is a global association of international moving companies called FIDI, which has approximately 750 affiliated companies around the world.
David Sigman, executive vice president and principal at LCOR, said, "The building's rich history, ample modem amenity spaces, and location in the heart of FiDi make it a truly unique offering and we're excited to bring it to market."
"However, our primary work will not just be about generating business, retail and new home sales, but will rather be about gaining momentum for FiDi as a growing neighborhood." [more]
New York City Planning Commissioner Amanda Burden unveils plan to transform abandoned FiDi arcades into sitting areas [NY1]