U2F (Universal 2 Factor)

U2F or Universal 2-Factor Authentication is a form of 2-factor authentication, in which the user completes a login process using a physical device as one form of verification to prove their identity and be granted access. U2F devices are physical security keys in and are usually combined with one of the other two major authentication factors: 1) something a user knows (such as a password or the answer to a question) or something the user is (such as a unique biometric marker like a fingerprint) - in order to grant access to a system. The benefit of a physical key over its counterparts, usually software-based keys, is that software keys, which generate one-time passwords delivered by phone or email, are known to be vulnerable to phishing attacks.

Unauthorized Disbursements

A disbursement is a payment made on behalf of another person for which reimbursement in the future is expected. An unauthorized disbursements could be defined as an amount of disbursements or expenditures made without any authorized approval. Unauthorized disbursements include five type of categories which are; check tampering, billing schemes, payroll schemes, register disbursements, and also expense reimbursement schemes.

Unauthorized use of assets

Unauthorized use of assets describes the intentional, illegal use of the property or funds of another person for one's own use or other unauthorized purpose, particularly by a public official, a trustee of a trust, an executor or administrator of a deceased person's estate, or by any person with a responsibility to care for and protect another's assets.


It is the delivery of less impressions, visitors, or conversions than contracted for a specified period of time. Underdelivery can occur for a variety of reasons. A site or network may experience an unexpected drop in traffic. Low CPM campaigns may be bumped for high CPM campaigns. Pay-for-performance may be bumped for any CPM campaigns, plus there is the added risk that the creative units fail to generate the anticipated level of response.

Unique Identity

A unique identifier (UID) is a numeric or alphanumeric string that is associated with a single entity within a given system. Unique identifiers can be assigned to anything that needs to be distinguished from other entities, such as individual users, companies, machines or websites.

Unsupervised Machine Learning

Unsupervised machine learning algorithms infer patterns from a data set without reference to known, or labeled, outcomes. Unlike supervised machine learning, unsupervised machine learning methods cannot be directly applied to a regression or a classification problem because you have no idea what the values for the output data might be, making it impossible for you to train the algorithm the way you normally would. Unsupervised learning can instead be used to discover the underlying structure of the data.


URL stands for Uniform Resource Locator, and is used to specify addresses on the World Wide Web. A URL is the fundamental network identification for any resource connected to the web (e.g., hypertext pages, images, and sound files). The domain name is the computer on which the resource is located.

URL spoofing

URL spoofing is the process of creating false or fake URLs which pose as another website. The spoofed URL or website address appear to be very similar to the original, actual URL, but in reality redirects the user to a 'booby trapped' website.

Utility fraud

Utility fraud is when a person fraudulently uses someone else's name or identity to order water, gas, cable or other types of services. Cable fraud is the most commonly committed utility scam.