Fraud

A deception deliberately practiced in order to secure unfair or unlawful gain.

Filtering

To select data. Filters use patterns against which all data are compared and only matching data are passed through, hence the concept of a filter. For example, e-mail clients and servers can look for messages with text patterns that are recognized as spam and delete them.

Windows mail

The e-mail and newsgroup client in Windows Vista. Windows Mail replaced Outlook Express, the lite version of Outlook that came with previous Windows versions

User agent

A client program that is used to access servers on a network, typically the Internet.

text messaging

Sending short messages over a cellphone network.

Spam

Unsolicited e-mail, often of a commercial nature, sent indiscriminately to multiple mailing lists, individuals, or newsgroups; junk e-mail.

Signature

A set of alphabetic or numeric characters used to authenticate a cryptographic message by ensuring that the sender cannot later disavow the message, the receiver cannot forge the message or signature, and the receiver can prove to others that the contents of the message are genuine and originated with the sender.