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	XSL attack - Wikipedia, the free encyclopedia
		In cryptography, the XSL attack is a method of cryptanalysis for block ciphers.
		In overview, the XSL attack relies on first analysing the internals of a cipher and deriving a system of quadratic simultaneous equations.
		The attack is notable for requiring only a handful of known plaintexts to perform; previous methods of cryptanalysis, such as linear and differential cryptanalysis, often require unrealistically large numbers of known or chosen plaintexts.
	en.wikipedia.org /wiki/XSL_attack (1322 words)

	Cryptanalysis - Open Encyclopedia (Site not responding. Last check: 2007-10-20)
		However, cryptanalysis usually excludes attacks that do not primarily target weaknesses in the actual cryptography; methods such as bribery, physical coercion, burglary, keylogging, and so forth, although these latter types of attack are an important concern in computer security, and are increasingly becoming more effective than traditional cryptanalysis.
		In academia, new designs are regularly presented, and are also frequently broken: the 1984 block cipher Madryga was found to be susceptible to ciphertext-only attacks in 1998; FEAL-4, proposed as a replacement for the DES standard encryption algorithm, was demolished by a spate of attacks from the academic community, many of which are entirely practical.
		A chosen-plaintext attack is less likely, but it is sometimes plausible: for example, you could convince someone to forward a message you have given them, but in encrypted form.
	open-encyclopedia.com /Cryptanalysis (2174 words)

	Encyclopedia: XSL attack
		The known-plaintext attack is a cryptanalytic attack in which the attacker has samples of both the plaintext and its encrypted version (ciphertext) and is at liberty to make use of them to reveal further secret information; typically this is the secret key.
		A chosen plaintext attack is any form of cryptanalysis which presumes that the attacker has the capability to choose arbitrary plaintexts to be encrypted and obtain the corresponding ciphertexts.
		Categories: Cryptographic attacks In cryptography, a block cipher is a symmetric key cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation.
	www.nationmaster.com /encyclopedia/XSL-attack (4434 words)

	Advanced Encryption Standard - the free encyclopedia (Site not responding. Last check: 2007-10-20)
		To avoid attacks based on simple algebraic properties, the S-box is constructed by combining the inverse functionwith an invertible affine transformation.
		In 2002, a theoretical attack, termed the "XSL attack", was announced by Nicolas Courtois andJosef Pieprzyk, showing a potential weakness in the AES algorithm.
		For the moment, as far as is publicly known, the XSL attack against AES is speculative; itis unlikely that anyone could carry out the current attack in practice.
	www.free-web-encyclopedia.com /?t=AES (1297 words)

	Advanced Encryption Standard - Open Encyclopedia (Site not responding. Last check: 2007-10-20)
		To avoid attacks based on simple algebraic properties, the S-box is constructed by combining the inverse function with an invertible affine transformation.
		In 2002, a theoretical attack, termed the "XSL attack", was announced by Nicolas Courtois and Josef Pieprzyk, showing a potential weakness in the AES algorithm.
		For the moment, as far as is publicly known, the XSL attack against AES is speculative; it is unlikely that anyone could carry out the current attack in practice.
	open-encyclopedia.com /AES (1271 words)

	XSL - TheBestLinks.com - Cipher, Extensible stylesheet language, Disambig, XSL attack, ...
		XSL - TheBestLinks.com - Cipher, Extensible stylesheet language, Disambig, XSL attack,...
		XSL, Cipher, Extensible stylesheet language, Disambig, XSL attack
		The XSL attack, a method for breaking ciphers
	www.thebestlinks.com /XSL.html (118 words)

	XSL attack (Site not responding. Last check: 2007-10-20)
		The attack is not related to the extensible stylesheet language (XSL) used to style XML.
		In 1999, Kipnis and Shamir showed that a particular public key algorithm — known as the Hidden Field Equations scheme (HFE) — could be reduced to a system of overdefined quadratic equations ("overdefined" means that there are more equations than unknowns).
		As of 2004, research into the efficiency of XL and its derivative algorithms remains ongoing (Yang and Chen, 2004).
	www.sciencedaily.com /encyclopedia/xsl_attack (1334 words)

	Cryptology ePrint Archive (Site not responding. Last check: 2007-10-20)
		The XSL attack would then be polynomial in Nr, with a huge constant that is double-exponential in the size of the S-box.
		The best attacks on AES that seem to be in about 2^87 or 2^100, comes from a simple adaptation of the second XSL attack described here, proposed by Murphy and Robshaw, in which equations are writen over GF(256).
		When studying such attacks, intuition is very tricky, and though Coppersmith and Moh once claimed that they know that such attacks will not work, so far we did not see any serious argument against XSL.
	eprint.iacr.org /2002/044 (484 words)

	[No title]
		To an engineer, an attack is something that is practical, or at least might be practical in a few years.
		Basically, the attack works by trying to express the entire algorithm as multivariate quadratic polynomials, and then using an innovative technique to treat the terms of those polynomials as individual variables.
		My fear is that we could see optimizations of the XSL attack breaking AES with a 2^80-ish complexity, in which case things starts to get dicey about ten years from now.
	www.politechbot.com /p-03990.html (1365 words)

	Microsoft Security Bulletin MS02-031
		A successful attack exploiting this vulnerability would require that the user accept and open a workbook from an attacker and then click on an object within the workbook.
		An attacker could not automate an attack using this vulnerability: the user would have to be enticed into taking an action after opening the attacker's workbook.
		XSL (eXtensible Stylesheet Language) is a language that provides a means to sort and manipulate XML data.
	www.microsoft.com /technet/security/bulletin/MS02-031.asp (3458 words)

	XSL - Wikipedia, the free encyclopedia
		In computing the eXtensible Stylesheet Language is a set of language technologies for defining XML document transformation and presentation
		The XSL attack (eXtended Sparse Linearisation attack), a method for breaking ciphers
		This page concerning a three-letter acronym or abbreviation is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title.
	en.wikipedia.org /wiki/XSL (107 words)

	Security Forums Dot Com :: View topic - AES: Security in a Nutshell
		Although this isn't an inherent proof that an attack exists, it is, however, justification enough to be skeptical, as algorithm design hasn't been extensively approached from this angle, so we have no definite clue as to whether or not an attack exists.
		This, in itself, would be a cryptographic epiphany, as classical block cipher attack methodology, ranging from linear and differential to techniques by Jakobsen and Knudsen operate exponentially, based on the number of rounds.
		This attack methodology, known as XSL, is extremely difficult to determine, complexity-wise.
	www.security-forums.com /forum/viewtopic.php?p=47765 (2870 words)

	XSL attack (Site not responding. Last check: 2007-10-20)
		Attack on the Pentagon illustrates the complexity of trying to protect federal agencies, buildings, and monuments while keeping them open to the public.
		Nato declares that the attack on the US is an attack on the entire 19-nation alliance, and it will provide support if Washington requests it.
		A new attack on European Union pressure to harmonise corporate taxation is due from chancellor Gordon Brown at today's EU Finance Ministers' Council meeting.
	www.omniknow.com /common/wiki.php?in=en&term=XSL_attack (2599 words)

	Advanced Encryption Standard (Site not responding. Last check: 2007-10-20)
		As of 2005, the best known attacks are on 7 rounds for 128-bit keys, 8 rounds for 192-bit keys, and 9 rounds for 256-bit keys (Ferguson et al, 2000).
		Several cryptography experts have found problems in the underlying mathematics of the proposed attack, suggesting that the authors may have made a mistake in their estimates.
		For the moment, the XSL attack against AES appears speculative; it is unlikely that anyone could carry out the current attack in practice.
	www.worldhistory.com /wiki/A/Advanced-Encryption-Standard.htm (1563 words)

	New Attacks on AES / Rijndael
		There are also two different versions of the XSL attack that can be found on eprint.
		Though for Vincent Rijmen, "XSL is not an attack it is a dream", many members of Nessie expressed serious reserves about the security of AES and Camellia (see this document, Section 2.2., on page 2).
		An analysis of the XSL attack and it's impact on the security of AES by Robshaw and Murphy.
	www.cryptosystem.net /aes (3776 words)

	All Net Tools - Forum - View Single Post - SSL enhancement with AES
		This would be reason enough for the paranoid to stop using rijandael and serpent.
		Some of the confusion stems from different definitions of "attack." To a cryptographer, an attack is anything that breaks the algorithm faster
		attack was demonstrated on simpler variants of DES and then
	www.all-nettools.com /forum/showpost.php?p=2371&postcount=6 (930 words)

	AES
		In the paper [1] N.T. Courtois and J. Pieprzyk propose an attack on Rijndael (AES) (for definition, the reader is referred to [2]).
		The method of XL [3] has been studied by us in [4] (it is listed in References of [1] as item [13]).
		Homepage of Serpent states: ``A paper by Courtois and Pieprzyk claims an attack on Serpent (and on Rijndael), and got some publicity.
	www.usdsi.com /aes.html (1595 words)

	Xsl, date format xsl, xsl transformation
		XSL is a standard W3C stylesheet language for both print and online rendering.
		XSL Formatting Objects (XSL-FO) are the second half of the Extensible Stylesheet...
		A stupid XSL trick is a use of XSLT for something unusual or amusing for which it wasn't necessarily designed.
	www.internetserviceinfo.com /xsl.html (1184 words)

	LWN: September CRYPTO-GRAM newsletter
		This attack works with any file on Bob's computer, and any file on another server that Bob currently has access to.
		A gun in the cockpit would probably make the latter attack easier, as the rogue pilot with the gun shoots his counterparts then crashes the plane, instead of having to fight off the rest of the cockpit crew.
		This has a tremendous impact on which methods are suitable for diagnosing diseases (and terrorists), and I certainly wish that the people responsible for diagnosing terrorism had studied more epidemiology before issuing the treatment.
	lwn.net /Articles/9907 (6101 words)

	[No title]
		The issue is whether or not a method has been devised which would allow one to break AES in a shorter period of time that that already possible via brute force attacks, and if this method can exist anywhere but on paper.
		Aside from the problems which accompany key transmission (how to get a secure key to those who should have it, while keeping it out of the hands of those who shouldn't), symmetric cryptosystems are consider rather strong.
		In contrast, asymmetric cryptosystems (such as RSA) are, by nature, susceptible to such attacks on account of the method by which it encrypts data.
	arstechnica.com /news.ars/post/20020916-1360.html (452 words)

	IT Help Central - MS02-031 (Cumulative Patches for Excel and Word for Windows) (Site not responding. Last check: 2007-10-20)
		A macro execution vulnerability 2 in Excel that results from a flaw in how macros in external workbooks are handled when opened by a hyperlink on a drawing shape within a workbook.
		A script execution vulnerability 3 related to how Excel processes workbooks that contain XSL style
		A variant of the "Word Mail Merge" vulnerability 4 first addressed in MS00-071.
	www.depts.ttu.edu /helpcentral/bulletins/MS02-031.php (3482 words)

	Nicolas T. COURTOIS' research in cryptography
		This attack has been now implemented by Nicolas Courtois, see the extended version of the paper.
		Two different versions of the XSL attack are available on eprint.iacr.org.
		Comments: This paper describes a subexponential attack on HFE and is the best attack ever found on HFE and HFE Challenge 1.
	www.minrank.org /~courtois/myresearch.html (1245 words)

	New AES crypto standard broken already? \| The Register
		Theoretical attacks against AES (Advanced Encryption Standard) winner Rijndael and runner-up Serpent have been published.
		The work is theoretical and needs to be reviewed by others; and even if it's confirmed in theory and partially confirmed empirically, it may never be possible to exploit it.
		My fear is that we could see optimizations of the XSL attack breaking AES with a 2^80-ish complexity, in which case things starts to get dicey about ten years from now," Schneier reckons.
	www.theregister.co.uk /2002/09/16/new_aes_crypto_standard_broken (407 words)

	Advanced Encryption Standard - Freepedia (Site not responding. Last check: 2007-10-20)
		cryptanalysis=A related-key attack can break up to 9 rounds of 256-bit AES.
		For a general article on that topic (not specific to AES) see Block cipher modes of operation.
		In this meaning, a crytographic "break" is anything faster than an exhaustive search, so an attack against 128-bit key AES requiring 'only' 2
	en.freepedia.org /AES.html (872 words)

	wikien.info: Main_Page (Site not responding. Last check: 2007-10-20)
		Encyclopedia : X : XS : XSL : XSL attack
		Courtois and Pieprzyk estimate that an "optimistic evaluation shows that the XSL attack might be able to break Rijndael [with] 256 bits and Serpent for key lengths [of] 192 and 256 bits.
		[Quadratic cryptanalysis - an explanation of the XSL attack]
	www.alanaditescili.net /index.php?title=XSL_attack (1281 words)

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