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• Next Up Previous Index Stream Ciphers.
• Two methods of generating pseudo-random bits, both in themselves very weak from a cryptographic point of view, because they are based on recurrence relations of a linear nature, are still at the root of most stream ciphers. ...
• The first section following will deal with stream ciphers based strictly on single-bit shift registers; the second section will deal not only with linear congruential pseudorandom number generators, but with other techniques, including a byte-wide shift register.
• Although one usually thinks of pseudo-random number or bit generation when one thinks of stream ciphers, the cipher produced by a rotor machine, which is a changing substitution (as opposed to a changing displacement, as produced by a Hagelin lug and pin machine) is still classed as a stream cipher. ...
• In general, autokey ciphers have poor error-propagation characteristics. ...
• Shift-Register Stream Ciphers .
• Other Stream Ciphers .

• Classic Ciphers.
• The first part of the seminar is devoted to the rudiments of cryptography, and to some " classic ciphers. ...
• Codes and ciphers. ...
• Simple substitution ciphers. ...

• Cryptanalysis of Block Ciphers with Overdefined Systems of Equations Nicolas Courtois and Josef Pieprzyk Abstract. Several recently proposed ciphers are built with layers of small S-boxes, interconnected by linear key-dependent layers. ...
• In this paper we study the security of such ciphers under an additional hypothesis: the S-box can be described by an overdefined system of algebraic equations (true with probability 1). ...
• More simulations are needed for bigger ciphers. ...
• At any rate, it seems that the security of these ciphers does NOT grow exponentially with the number of rounds. ...
• secret-key cryptography / block ciphers, AES, Rijndael, Square, Serpent, Camellia, multivariate quadratic equations, MQ problem, overdefined systems of multivariate equations, XL algorithm, Grobner bases, sparse multivariate polynomials. ... This paper contains a general description of the so called first and second XSL attack on block ciphers. ...

• crypt ciphers.
• crypt ciphers Hi.
• RE: crypt ciphers Rijndael is the basis for the "Advanced Encryption Standard" (AES) specified by the US National Institute of Standards and Technology (NIST).

• (c) 2000-04 PMC Ciphers, Inc. ...
• PMC Ciphers, Inc.
• PMC Ciphers, Inc.

• Bletchley Park Academic Website, now called Codes and Ciphers in the Second World War, has moved to http://www. ...

• Algebraic Attacks on Stream Ciphers.
• Algrabric Attacks are a new powerful tool to cryptanalyse many stream ciphers previously believed very secure. All stream ciphers with linear feedback (one or several LFSR, linear cellular automata etc. ...
• References - Algebraic attacks on stream ciphers:.
• Rose: Rewriting Variables: the Complexity of Fast Algebraic Attacks on Stream Ciphers.
• Also presented at SASC Ecrypt workshop (State of the Art in Stream Ciphers). ...
• A Finish course on algebraic attacks on stream ciphers. ...
• Frederik Armknecht: Algebraic Attacks on Stream Ciphers, Tutorial presented at ECCOMAS, Fourth European Congress on Computational Methods in Applied Sciences and Engineering, Jyväskylä, Finland, 24-28 July 2004. ...
• Presentations by Frederik Armknecht: one that overwievs algebraic attacks on block and stream ciphers. ...
• Nicolas Courtois: Fast Algebraic Attacks on Stream Ciphers with Liner Feedback. ...
• Open problems in the field of algebraic attacks on various ciphers: STORK report "Open problems in multivariate cryptanalysis". ...
• Nicolas Courtois, Willi Meier: Algebraic Attacks on Stream Ciphers with Liner Feedback. ...
• References - How to avoid algebraic attacks on stream ciphers:.
• Nicolas Courtois, General Principles of Algebraic Attacks and New Design Criteria for Components of Symmetric Ciphers. ...
• An alternative to LFSR-based stream ciphers that allows to avoid algebraic attacks have been recently proposed by Adi Shamir and Alexander Klimov: Invited talk at FSE 2004, LNCS, Springer, also announced at the Rump session of Crypto 2003 and also presented at ENS, Paris in December 2003. ...
• Security of important ciphers used in practice: Security of DES.

• (c) 2000-04 PMC Ciphers, Inc. ...
• From your personal journal to highly confidential military blueprints, Your information will be safe with encryption software from PMC Ciphers.

• The Beale Treasure Ciphers.
• Whoever unravels the so-called Beale ciphers will earn a reward of over £10 million in gold, silver and jewels.
• The story of the Beale ciphers begins in January 1820, when a stranger by the name of Thomas J. ...
• The note revealed the truth about Beale, the box, and the ciphers. ...
• In 1862, at the age of 84, Morriss knew that he was coming to the end of his life, and realised that he had to share the secret of the Beale ciphers, otherwise any hope of carrying out Beale’s wishes would die with him. ... First, he published a pamphlet, which contains the entire Beale story, including the Beale ciphers and Morriss’s account of the events surrounding the mystery. ...
• a key failed to unlock the other two Beale ciphers. ...
• the remaining Beale ciphers, but despite strenuous efforts .
• most ardent treasure hunters attracted to the Beale ciphers .
• of World War I was intrigued by the Beale ciphers, as was .
• Beale ciphers part of the training programme, because he believed .
• the ciphers to be of “diabolical ingenuity, specifically designed .
• Beale ciphers have occupied:.
• that the Beale ciphers are an elaborate hoax. ...
• ciphers was supposedly written in 1822, but it contains the word .
• Evidence in favour of the probity of the ciphers comes .

• There is abundant literature on how to use linear approximations to break various stream ciphers. ... Our new attack allows to break efficiently stream ciphers that are known to be immune to all the previously known attacks. ...
• Algebraic cryptanalysis, multivariate equations, overdefined equations, Reed-Muller codes, correlation immunity, XL algorithm, Gröbner bases, stream ciphers, pseudo-random generators, nonlinear filtering, ciphertext-only attacks, Toyocrypt, Cryptrec. ...

• PMC ciphers .
•   Polymorphic Cipher Theory (based on the paper “A Generalized Model for Polymorphic Ciphers“ by C. ...
• A generalized model for self-compiling crypto code as implemented in recent designs of Polymorphic Ciphers is proposed. Polymorphic Ciphers use a pseudo-random number generator which consists of a number of primitive pseudo-random number generators for the generation of a confusion sequence which is directly used to XOR plaintext bits. Self-compiling ciphers are basically stream ciphers while actual implementations are a mixture of block- and stream ciphers. ... In contrast to most or all commonly known symmetric encryption algorithm designs (including the AES candidates such as Rijndael and Twofish), polymorphic ciphers can be made immune to Differential Power Attack.
• The Polymorphic Algorithm, which is discussed in this paper, belongs to the class of symmetric ciphers. It’s roots are found in stream ciphers.
• Common ciphers are basically fixed pieces of software which treat plaintext with a key during the process of encryption. ...
• Classic symmetric ciphers.
• It is not possible to apply this principle in such designs, which does not necessarily mean that this class of ciphers is inherently weak.
• Possible cryptanalytic attacks on symmetric ciphers.
• Ciphertext-only attacks only rely on encrypted data and usually fail for good ciphers.
• Differential cryptanalysis is a kind of attack which can only be applied to block ciphers. ...
• Classic stream ciphers.
• Stream ciphers basically perform a time-varying transformation on individual plaintext digits. ...

• Efficient Block Ciphers for Smartcards .
• We present a family of block ciphers that can be implemented very efficiently on cheap Smartcard processors. The ciphers use a very small amount of RAM and a reasonable amount of ROM. ... The ciphers resist theoretical and practical cryptanalytic attacks and in their design timing and power analysis attacks have been taken into account. ...
• We present a family of block ciphers that are suited for this purpose. Additionally, all these ciphers can be used as efficient one-way function and the variants with block size of 196 bits or higher are efficient compression function to form an iterated cryptographic hash function. ...
• Currently, the Square family consists of three ciphers: Square, with a block length and a key length of 128 bits; BKSQ with a block length of 96 bits and a variable key length (96, 144 or 192 bits); and Rijndael with a variable block length and key length (both can be independently specified at 128, 192 or 256 bits). The three ciphers are designed to be secure against all known cryptographic attacks. ...
• Section 3 discusses the implementation of the ciphers on typical Smartcard processors. Section 4 treats the features of the presented ciphers to thwart attacks that exploit typical weaknesses of cipher implementations on Smartcards. ...
• Figure 1: Graphical illustration of some basic operations of the Square ciphers. ...
• The Square ciphers do not have the Feistel structure, like e. ... Whereas for Feistel ciphers the operation of the cipher can be inverted by simply reordering the round keys, this is not possible for the Square ciphers. ...
• In this section we will explain that the ciphers of the Square family lend themselves to implementations that provide resistance against this type of attack typical for Smartcards. ...
• For the Square ciphers the CPU time is independent of the cipher key and plaintext. ... For the Square ciphers the series of instructions is fixed. ...

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