Digital PseudonymsGenerally speaking, users who use a pseudonym online can often be identified by the service using factors such as their IP address or mobile phone number. However, the public may not have access to such information, allowing pseudonyms to enhance privacy in a meaningful way.
Cryptography & PseudonymsIn areas such as cryptography, pseudonymity may be used as a privacy mechanism. For example, some types of digital certificates may allow individuals to use a pseudonym if it is declared as such. Technologies such as digital currency may also use pseudonymity techniques.
The use of an invented name and other identifying information such as a user name in order to establish some degree of anonymity.