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Punycode is a representation of Unicode with the limited ASCII character subset used for Internet hostnames.Using Punycode, host names containing Unicode characters are transcoded to a subset of ASCII consisting of letters, digits, and hyphens, which is called the letter–digit–hyphen (LDH) subset.
Example of Greek IDN with domain name in non-Latin alphabet: ουτοπία.δπθ.gr (Punycode is xn--kxae4bafwg.xn--pxaix.gr)An internationalized domain name (IDN) is an Internet domain name that contains at least one label displayed in software applications, in whole or in part, in non-Latin script or alphabet [a] or in the Latin alphabet-based characters with diacritics or ligatures.
With the exception of the information emoji (ℹ), the trademark emoji (™️) and the "m" emoji (Ⓜ️), [citation needed] for an emoji to work as a domain name, it must be converted into so-called "Punycode". Punycode is a character encoding method used for internationalized domain names (IDNs). This representation is used when registering ...
An example of an IDN homograph attack; the Latin letters "e" and "a" are replaced with the Cyrillic letters "е" and "а".The internationalized domain name (IDN) homograph attack (sometimes written as homoglyph attack) is a method used by malicious parties to deceive computer users about what remote system they are communicating with, by exploiting the fact that many different characters look ...
Another technique is to use a 'cloaked' URL. [3] By using domain forwarding, or inserting control characters, the URL can appear to be genuine while concealing the actual address of the malicious website. Punycode can also be used for this purpose. Punycode-based attacks exploit the similar characters in different writing systems in common fonts.
Unfortunately, even legitimate URLs can be spoofed using non-Roman characters that look right to human eyes but are actually grabbed from other languages (a so-called punycode attack).
Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications (IDNA) March 2003: Punycode: RFC 3501 : INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1: March 2003: IMAP v 4r1: RFC 3530 : Network File System (NFS) version 4 Protocol: April 2003: NFS v 4: RFC 3538
URL encoding, officially known as percent-encoding, is a method to encode arbitrary data in a uniform resource identifier (URI) using only the US-ASCII characters legal within a URI. Although it is known as URL encoding , it is also used more generally within the main Uniform Resource Identifier (URI) set, which includes both Uniform Resource ...