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In the XSL attack, a specialized algorithm, termed XSL ( eXtended Sparse Linearization ), is then applied to solve these equations and recover the key.
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XSL and attack
In 2002, a theoretical attack, termed the " XSL attack ", was announced by Nicolas Courtois and Josef Pieprzyk, purporting to show a weakness in the AES algorithm due to its simple description .< ref >
* The XSL attack ( eXtended Sparse Linearisation attack ), a method for breaking ciphers
XSL attack •
The XSL attack, if effective, would weaken Serpent ( though not as much as it would weaken Rijndael, which became AES ).
However, many cryptanalysts believe that once implementation considerations are taken into account the XSL attack would be more expensive than a brute force attack.
In cryptography, the XSL attack is a method of cryptanalysis for block ciphers.
In overview, the XSL attack relies on first analyzing the internals of a cipher and deriving a system of quadratic simultaneous equations.
The XSL attack requires an efficient algorithm for tackling MQ.
Courtois and Pieprzyk estimate that an " optimistic evaluation shows that the XSL attack might be able to break Rijndael 256 bits and Serpent for key lengths 192 and 256 bits.
In AES 4 Conference, Bonn 2004, one of the inventors of Rijndael, Vincent Rijmen, commented, " The XSL attack is not an attack.
An XSL attack mounted on this system yields a simpler set of equations which would break AES with complexity of around 2 < sup > 100 </ sup >, if the Courtois and Pieprzyk analysis is correct.
Even if XSL works against some modern algorithms, the attack currently poses little danger in terms of practical security.
* " Quadratic Cryptanalysis ", an explanation of the XSL attack by J. J. G. Savard
simple: XSL attack
He has worked on cryptography, in particular the XSL attack.
Courtois was one of the co-authors of both the XSL attack against block ciphers such as the Advanced Encryption Standard and the XL system for solving systems of algebraic equations, used in the attack.
XSL and algorithm
However, the systems of equations produced had a special structure, and the XSL algorithm was developed as a refinement of XL which could take advantage of this structure.
The XSL algorithm is tailored to solve the type of equation systems that are produced.
In 2005 Cid and Leurent gave evidence that, in its proposed form, the XSL algorithm does not provide an efficient method for solving the AES system of equations ; however Courtois disputes their findings.
XSL and ),
In response to a submission from Arbortext, Inso, and Microsoft, a W3C working group on XSL started operating in December 1997, with Sharon Adler and Steve Zilles as co-chairs, with James Clark acting as editor ( and unofficially as chief designer ), and Chris Lilley as the W3C staff contact.
XML Path Language ( XPath ), itself part of the XSL family, functions within XSLT as a means of navigating an XML document.
XSL-FO is part of XSL ( Extensible Stylesheet Language ), a set of W3C technologies designed for the transformation and formatting of XML data.
* Formatting Objects Processor ( or Apache FOP ), a Java application that converts XSL Formatting Objects ( XSL-FO ) files to other formats
XSL and is
In computing, the term Extensible Stylesheet Language ( XSL ) is used to refer to a family of
# XSL Transformation ( XSLT ): is an XML language for transforming XML documents
As a result, the term XSL is now used with a number of different meanings:
* Sometimes it refers to XSL-FO: this usage can be justified by the fact that the XSL-FO specification carries the title Extensible Stylesheet Language ( XSL ); however, the term XSL-FO is less likely to be misunderstood
This article is concerned with the various usages of the term XSL: for details of the various languages embraced by the term, see the relevant article.
Support for XSL Formatting Objects is available in a number of products:
is: XSL
XSLT ( Extensible Stylesheet Language Transformations ) is a language for transforming XML documents into other XML documents, or other objects such as HTML for web pages, plain text or into XSL Formatting Objects which can then be converted to PDF, PostScript and PNG.
Nearly always, this is accomplished using DocBook XSL stylesheets.
Because the standard DocBook XSL stylesheets are well-formed XSL stylesheets, and DocBook is well-formed XML, users can write their own customized stylesheets or even a full-fledged program to process the DocBook into an appropriate output format as their needs dictate.
Web help is a chunked html output format in the DocBook XSL stylesheets that was introduced in version 1. 76. 1.
XSL Formatting Objects, or XSL-FO, is a markup language for XML document formatting which is most often used to generate PDFs.
Formatting Objects Processor ( FOP, also known as Apache FOP ) is a Java application that converts XSL Formatting Objects ( XSL-FO ) files to PDF or other printable formats.
Instead, the style is defined in an external style sheet file using a style sheet language such as CSS or XSL.
The Open Source tool DocBook XSL can also generate help files and is an excellent resource for single source publishing.
The arena is home to the Detroit Ignition, a Major Indoor Soccer League / XSL team, as well as the Compuware Ambassadors minor hockey program.
XSL and then
If the output can pass through an XML format during output, then XSLT and XSL-FO can be used to transform the document to various forms ( see DocBook XSL ).
XSL and these
Currently specifications ( for example, XHTML, XSL, CSS ) and software tools implementing these specification are only reaching the early stages of maturity.
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