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Double encoding information


Double encoding is the act of encoding data twice in a row using the same encoding scheme. It is usually used as an attack technique to bypass authorization schemes or security filters that intercept user input. In double encoding attacks against security filters, characters of the payload that are treated as illegal by those filters are replaced with their double-encoded form.

Double URI-encoding is a special type of double encoding in which data is URI-encoded twice in a row. It has been used to bypass authorization schemes and security filters against code injection, directory traversal, cross-site scripting (XSS) and SQL injection.

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Double encoding

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Double encoding is the act of encoding data twice in a row using the same encoding scheme. It is usually used as an attack technique to bypass authorization...

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Directory traversal attack

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application vulnerable to Double percent-encoding attacks in which illegal characters are replaced by their double-percent-encoded form in order to bypass...

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Character encoding

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hand-written encoding and cyphering systems, such as Bacon's cipher, Braille, international maritime signal flags, and the 4-digit encoding of Chinese characters...

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Differential Manchester encoding

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F2F (frequency/double frequency), Aiken biphase, and conditioned diphase. Differential Manchester encoding is a differential encoding technology, using...

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Shift JIS

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extension of the single-byte encoding JIS X 0201:1997, that uses unassigned code points in JIS X 0201 to encode the double-byte JIS X 0208:1997 character...

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Manchester code

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data storage, Manchester code (also known as phase encoding, or PE) is a line code in which the encoding of each data bit is either low then high, or high...

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Punycode

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encoding, using the example of the string "bücher" (Bücher is German for books), which is translated into the label "bcher-kva". To make the encoding...

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Metaphone

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implementation of Double Metaphone can be used. Alternatively, version 2.1.3 of Metaphone 3, an earlier 2009 version without a number of encoding corrections...

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Unipolar encoding

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Unipolar encoding is a line code. A positive voltage represents a binary 1, and zero volts indicates a binary 0. It is the simplest line code, directly...

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W

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double-u, plural double-ues. Double-u, whose name reflects stages in the letter's evolution when it was considered two of the same letter, a double U...

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Chinese character encoding

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no mandated connection between the encoding system and the font used to display the characters; font and encoding are usually tied together for practical...

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The Peasant Marey

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Fyodor Dostoevsky, and a frequently anthologized work of fiction. This "double encoding" arises from its framing as both short story, narrated by the fictional...

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A

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org Suignard, Michel (9 May 2017), L2/17-076R2: Revised Proposal for the Encoding of an Egyptological YOD and Ugaritic Characters (PDF), archived (PDF) from...

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Modified frequency modulation

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On average, MFM achieves double the information density of FM. The basic encoding rule for MFM is that (x, y, z, ...) encodes to (x, x NOR y, y, y NOR...

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Quotation mark

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that cannot support the encoding. For example, many simple text editors only handle a few encodings or assume that the encoding of any file opened is a...

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JIS encoding

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In computing, JIS encoding refers to several Japanese Industrial Standards for encoding the Japanese language. Strictly speaking, the term means either:...

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Group coded recording

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(RLL) encoding scheme, belonging into the group of modulation codes. The others are different mainframe hard disk as well as floppy disk encoding methods...

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Shellcode

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JavaScript string using percent-encoding, escape sequence encoding "\uXXXX" or entity encoding. Some exploits also obfuscate the encoded shellcode string further...

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Japanese language and computers

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single byte - Japanese is thus encoded using two or more bytes, in a so-called "double byte" or "multi-byte" encoding. Problems that arise relate to transliteration...

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Extended Unix Code

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EBCDIC encoding used by Hitachi, with double-byte characters (a DBCS-Host encoding) included using shifting sequences, making it a stateful encoding. Specifically...

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Hamming code

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choice must be used for both encoding and decoding. This general rule can be shown visually: Shown are only 20 encoded bits (5 parity, 15 data) but the...

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G

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written in two forms: the single-storey (sometimes "opentail") and the double-storey (sometimes "looptail") . The former is commonly used in handwriting...

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Cyrillic o variants

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Hwair Ꚙ : Double O Dotted zero Ꚛ :Crossed O Everson, Michael; Birnbaum, David; Cleminson, Ralph; et al. (2007-03-21). "Proposal to encode additional...

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Danda

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also in other Indic scripts, like Bengali, Telugu, Oriya, and others. Encoding it separately for every Indic script was proposed, but as of 2020, this...

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