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  2. Percent-encoding - Wikipedia

    en.wikipedia.org/wiki/Percent-encoding

    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 ...

  3. URI normalization - Wikipedia

    en.wikipedia.org/wiki/URI_normalization

    The following normalizations are described in RFC 3986 [1] to result in equivalent URIs: . Converting percent-encoded triplets to uppercase. The hexadecimal digits within a percent-encoding triplet of the URI (e.g., %3a versus %3A) are case-insensitive and therefore should be normalized to use uppercase letters for the digits A-F. [2] Example:

  4. Online codes - Wikipedia

    en.wikipedia.org/wiki/Online_codes

    High level view of the use of online codes. The online encoding algorithm consists of several phases. First the message is split into n fixed size message blocks. Then the outer encoding is an erasure code which produces auxiliary blocks that are appended to the message blocks to form a composite message.

  5. Base64 - Wikipedia

    en.wikipedia.org/wiki/Base64

    Encoding an attachment as Base64 before sending, and then decoding when received, assures older SMTP servers will not interfere with the attachment. Base64 encoding causes an overhead of 33–37% relative to the size of the original binary data (33% by the encoding itself; up to 4% more by the inserted line breaks).

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  7. data URI scheme - Wikipedia

    en.wikipedia.org/wiki/Data_URI_scheme

    The data URI scheme is a uniform resource identifier (URI) scheme that provides a way to include data in-line in Web pages as if they were external resources. It is a form of file literal or here document.

  8. Punycode - Wikipedia

    en.wikipedia.org/wiki/Punycode

    To prevent hyphens in non-international domain names from triggering a Punycode decoding, the string xn--is prepended to Punycode sequences in internationalized domain names. This is called ACE (ASCII Compatible Encoding). [6] Thus the domain name "bücher.tld" would be represented in a URL as "xn--bcher-kva.tld".

  9. Double encoding - Wikipedia

    en.wikipedia.org/wiki/Double_encoding

    Decoding some user input twice using the same decoding scheme, once before a security measure and once afterwards, may allow double encoding attacks to bypass that security measure. [15] Thus, to prevent double encoding attacks, all decoding operations on user input should occur before authorization schemes and security filters that intercept ...