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Topic: Cryptanalysis

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  Linear Cryptanalysis: A Literature Survey
Perhaps the best introduction to Linear Cryptanalysis is the original article by Matsui, although continued development can be expected to have changed this original approach somewhat.
The complexity of differential cryptanalysis depends on the size of the largest entry in the XOR table, the total number of zeros in the XOR table, and the number of nonzero entries in the first column of that table [1], [3].
The complexity of differential cryptanalysis depends on the size of the largest entry in the XOR table, the total number of zeros in the XOR table, and the number of nonzero entries in the first column in that table [1], [8].
www.ciphersbyritter.com /RES/LINANA.HTM   (2070 words)

 Careers in Cryptanalysis and Signals Analysis at National Security Agency (NSA)
Cryptanalysis and Signals Analysis are core technical disciplines necessary for NSA to accomplish its mission and provide critical intelligence to the Nation's leaders.
Cryptanalysis is the analytic investigation of an information system with the goal of illuminating hidden aspects of that system.
Cryptanalysis is one of the core technical disciplines necessary for the National Security Agency (NSA) to accomplish its mission and provide critical intelligence to the Nation's leaders, and the need for Cryptanalysts will remain constant in our ever-changing global environment.
www.nsa.gov /careers/careers_8.cfm   (363 words)

 Recommended Cryptography Books: Cryptanalysis Section
It's a shame this book is out of print, because it's packed with cryptanalysis source code.
Poe introduced the public to letter frequency cryptanalysis when the short story "The Gold-Bug" was first published in 1843.
Chapters 2 through 4 are provide a very good (but fast paced) treatment on cryptography and cryptanalysis.
www.youdzone.com /cryptobooks_Cryptanalysis.html   (900 words)

  What is cryptanalysis? - a definition from Whatis.com
- Cryptanalysis refers to the study of ciphers, ciphertext, or cryptosystems (that is, to secret code systems) with a view to finding weaknesses in them that will permit retrieval of the plaintext from the ciphertext, without necessarily knowing the key or the algorithm.
However, successful cryptanalysis has made the enormous resources often devoted to it more than worthwhile: the breaking of the German Enigma code during WWII, for example, was one of the key factors in an early Allied victory.
Today, cryptanalysis is practiced by a broad range of organizations: governments try to break other governments' diplomatic and military transmissions; companies developing security products send them to cryptanalysts to test their security features and to a hacker or cracker to try to break the security of Web sites by finding weaknesses in the securing protocols.
searchsecurity.techtarget.com /sDefinition/0,,sid14_gci214432,00.html   (932 words)

  What is Cryptanalysis?
Cryptanalysis is the study of taking encrypted data, and trying to unencrypt it without use of the key.
Cryptanalysis is also appropriately used by designers of encryption systems to find, and subsequently correct, any weaknesses that may exist in the system under design.
Cryptanalysis also has an interesting historical element; the famous Enigma machine, used by the Germans to send secret messages, was ultimately cracked by members of the Polish resistance and transferred to the British.
www.wisegeek.com /what-is-cryptanalysis.htm   (401 words)

  Cryptanalysis - Encyclopedia.WorldSearch   (Site not responding. Last check: )
Cryptanalysis (from the Greek kryptós, "hidden", and analýein, "to loosen" or "to untie") is the study of methods for obtaining the meaning of encrypted information without access to the secret information which is normally required to do so.
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.
Cryptanalysis has coevolved together with cryptography, and the contest can be traced through the history of cryptography — new ciphers being designed to replace old broken designs, and new cryptanalytic techniques invented to crack the improved schemes.
encyclopedia.worldsearch.com /cryptanalysis.htm   (2288 words)

 Cryptanalysis Info - Encyclopedia WikiWhat.com   (Site not responding. Last check: )
Cryptanalysis (from the Greek kryptós and analy´ein, "to loosen" or "to untie"), strictly, includes methods and techniques of recovering information from encrypted material (produced by ciphers or codes) without knowledge of the key, or codebook.
For single-key (secret key) cryptography there is no significant difference between chosen plaintext and chosen ciphertext if the key is known, but in two-key cryptography it is possible for one of the encryption or decryption functions to be secure against chosen input (either plain or encrypted) while the other is vulnerable.
Unlike ciphertext attacks or ciphertext/plaintext pair attacks in single-key cryptosystems, this sort of cryptanalysis is aimed at breaking the cryptosystem by analysis that can be carried out based only on a knowledge of the underlying connection between the two keys.
www.wikiwhat.com /encyclopedia/c/cr/cryptanalysis_1.html   (720 words)

 Info and facts on 'Cryptanalysis'   (Site not responding. Last check: )
In non-technical language, this is the practice of codebreaking or cracking the code, although these phrases also have a specialised technical meaning (see code ((computer science) the symbolic arrangement of data or instructions in a computer program or the set of such instructions)).
Moreover, automation was for the first time applied to cryptanalysis with the Bomba (additional info and facts about Bomba) device and the Colossus (A person of exceptional importance and reputation) — one of the earliest computers (A machine for performing calculations automatically).
Another distinguishing feature of asymmetric schemes is that, unlike attacks on symmetric cryptosystems, any cryptanalysis has the opportunity to make use of knowledge gained from the public key (additional info and facts about public key).
www.absoluteastronomy.com /encyclopedia/c/cr/cryptanalysis.htm   (2708 words)

 Differential Cryptanalysis
However, differential cryptanalysis is still a viable method to use for reduced versions of DES (using less than the prescribed 16 rounds), and is still effective in making easier an attack on the full DES.
In fact, that is how differential cryptanalysis works--by guessing bits of the key through various methods, until a brute force search on the remaining bits of the key becomes feasible and faster than other, more complex methods.
One important note about differential cryptanalysis is that it always works using a pair of plaintexts or inputs, so that they may be compared.
home.earthlink.net /~mylnir/desdoc.html   (3579 words)

 cryptanalysis   (Site not responding. Last check: )
nl:Crypto-analyse Cryptanalysis (from the Greek kryptós and analy´ein, "to loosen" or "to untie"), strictly, includes methods and techniques of recovering information from encrypted material (produced by ciphers or codes) without knowledge of the key, or codebook.
Factoring techniques may continue do so as well, but will most likely depend on mathematical insight and creativity, neither of which has ever been successfully predictable.
The security of two-key cryptography depends on mathematical questions in a way that single-key cryptography generally did not, and conversely equates cryptanalysis to mathematical research in a new way.
www.yourencyclopedia.net /Cryptanalysis.html   (704 words)

 Cryptology | Cryptanalysis: Introduction
Cryptanalysis is the science of 'codebreaking,' in which a person reconstructs the original plaintext message from an encrypted version.
Cryptanalysis is different than simply 'decoding' or 'deciphering' a cryptogram since cryptanalysts do not have prior knowledge of the encryption or key used to encrypt and must determine these things on their own.
For the average person, cryptanalysis will help you improve deductive skills for your future private detective career as well as teach you a good deal of patience -- and of course the newspaper cryptograms will be no challenge at all to you with a hearty understanding of cryptanalysis.
library.thinkquest.org /27993/crypto/classic/analysis1.shtml   (372 words)

The greatest triumphs of cryptanalysis occurred during the second world war - the Polish and British cracking of the Enigma ciphers and the American cryptanalysis of the Japanese RED, ORANGE and PURPLE ciphers.
The cryptanalysis of single-key cryptosystems depends on one simple fact - that some traces of the original structure of the plaintext may be visible in the ciphertext.
Cryptanalysis of public key ciphers is therefore virtually indistinguishable from research into any other area of mathematics.
www.ridex.co.uk /cryptology   (10089 words)

 Differential Cryptanalysis
Differential Cryptanalysis is a potent cryptanalytic technique introduced by Biham and Shamir [3].
Differential cryptanalysis is designed for the study and attack of DES-like cryptosystems.
All of the cryptosystems thus far studied using differential cryptanalysis are non-probabilistic cryptosystems in which each plaintext corresponds to a unique ciphertext, i.e.
www.santafe.edu /~hag/crypto/node22.html   (212 words)

 Differential and Linear Cryptanalysis   (Site not responding. Last check: )
One property they have is that even if one has some corresponding plaintext and ciphertext, it is not at all easy to determine what key has been used.
However, if one is fortunate enough to have a large quantity of corresponding plaintext and ciphertext blocks for a particular unknown key, a technique called differential cryptanalysis, developed by Eli Biham and Adi Shamir, is available to obtain clues about some bits of the key, thereby shortening an exhaustive search.
In fact, however, a complete pattern of which bits change and do not change in the input and in the output is the subject of differential cryptanalysis.
www.quadibloc.com /crypto/co040501.htm   (489 words)

Cryptanalysis is the art of deciphering encrypted communications without knowing the proper keys.
A good example of this attack is the differential cryptanalysis which can be applied against block ciphers (and in some cases also against hash functions).
The differential cryptanalysis introduced by Eli Biham and Adi Shamir in late 1980's was the first attack that fully utilized this idea against block ciphers (especially against DES).
euclid.colorado.edu /~hiba/crypto/cryptanalysis.html   (1362 words)

 An Introduction to Side Channel Cryptanalysis of RSA
Cryptographic algorithms that withstood years of mathematical cryptanalysis were proven by various researchers to be vulnerable to such attacks, especially in resource-constrained physical systems, such as embedded systems.
Passive side-channel attacks and cryptanalysis are harder to detect, because the attacker monitors the behavior of the system and does not actively interact with it.
The emerging research field of implementation cryptanalysis clearly calls for an increase in education and development of expertise which address both the theoretical and practical issues of implementing cryptographic algorithms in a secure manner.
www.acm.org /crossroads/xrds11-3/sidechannel.html   (2080 words)

 Cryptanalysis (from ciphers and codes) --  Britannica Student Encyclopedia
Cryptanalysis (from ciphers and codes) --  Britannica Student Encyclopedia
More results on "Cryptanalysis (from ciphers and codes)" when you join.
More from Britannica on "Cryptanalysis (from ciphers and codes)"...
www.britannica.com /ebi/article-198636   (743 words)

 RSA Laboratories - 2.4.1 What is cryptanalysis?
Cryptanalysis is the flip-side of cryptography: it is the science of cracking codes, decoding secrets, violating authentication schemes, and in general, breaking cryptographic protocols.
This is precisely the reason why the most trusted encryption algorithms are ones that have been made available to public scrutiny.
The various techniques in cryptanalysis attempting to compromise cryptosystems are referred to as attacks.
www.rsa.com /rsalabs/node.asp?id=2200   (179 words)

 Extensions of Differential Cryptanalysis
The technique of differential cryptanalysis, in addition to being very powerful by itself, has served as a basis for the development of even more powerful techniques, such as those surveyed here and in the next section.
Another important addition to the available techniques deriving from differential cryptanalysis is the use of higher-order differentials, which first appeared in a paper by Xuejia Lai.
Recently, a means of improving the flexibility of differential cryptanalysis was discovered by David A. Wagner.
www.quadibloc.com /crypto/co4511.htm   (602 words)

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