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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.


FInite DOmains. A constraint language implemented on top of Prolog.


(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,
References in periodicals archive ?
Institution specialisee des Nations Unies, le FIDA se consacre exclusivement a l'investissement dans les zones rurales et a l'exploitation du potentiel des petits agriculteurs et des autres populations rurales pour contribuer au developpement durable.
Dr Fida believes that through screening and early detection, she can prevent a new-born from being affected as well as aid adults suffering from the disease.
Fida noted that Makkah's landscape, which includes rugged and rocky terrain, is not easily accessible.
According to Fida, a rumor began spreading over the internet that Angham and the director of the drama had a major dispute that lead the singer to leave the filming location .
Osama's youngest wife Amal, according to Fida, had never returned to Yemen, contrary to some reports.
For more information call Ms Fida, on 0121 633 4140 or visit: www.
At the ripe old age of 85, celebrated Indian artist Maqbool Fida Husain has made his first feature film, not only writing and directing, but also working as production designer, editor and co-producer.
Sources said that the relations between former district general secretary Fida Hussain and former district president Manfat Khan remained strained during the entire constitutional tenure then.
GILGIT -- Secretary Information Gilgit Baltistan, Fida Hussain here Thursday said Rs25 billion has been paid to the newspapers on account of publishing special supplements and efforts was underway for quick provision of payments of regular advertisements.
A spokesman for Bahawalpur police said here on Wednesday that an absconder identified as Fida Hussain had murdered his wife after she got divorce from him due to dispute.
Karachi -- A commemorative evening was organised and hosted by Architecture Design Art (ADA) to honour the larger than life, late Mr Habib Fida Ali at his residence.