
	Where results make sense

Topic: Stream cipher

Related Topics

Stream cipher attack

Classical cipher

RC4 (cipher)

Ciphertext stealing

Block cipher

Initialization vector

Block cipher modes of operation

Vernam cipher

Shrinking generator

CipherSaber

Running key cipher

Cipher

Encryption

Chosen ciphertext attack

RC4

In the News (Mon 6 Oct 08)

Eli Manning

Josh Beckett

Sage Rosenfels

South Ossetia

Super League

Angelina Jolie

West Bengal

Wayne Rooney

Howard Stern

Beth Ostrosky

	Notes on the ECRYPT Stream Cipher project (eSTREAM)
		ECRYPT (www.ecrypt.eu.org), a consortium of European research organizations, issued a Call for Stream Cipher Primitives in November 2004.
		"Cryptanalysis of Stream Cipher DECIM" by H. Wu and B. Preneel.
		The consensus of the SASC 2007 audience was that tweaks should continue to be allowed for "promising" ciphers.
	cr.yp.to /streamciphers.html (1207 words)

	Kids.Net.Au - Encyclopedia > Stream cipher
		A stream cipher is a cipher in which the input data is encrypted one bit (sometimes one byte) at a time.
		Stream ciphers represent a line of cipher development which is different from block ciphers although there are simple mathematical transformations that convert stream ciphers to block ciphers and vice versa.
		Some ciphers, called self-synchronizing stream ciphers, use several previous ciphertext bits to compute the keystream (as opposed to synchronous stream ciphers, in which the keystream is generated independently of the plaintext and the ciphertext).
	www.kids.net.au /encyclopedia-wiki/st/Stream_cipher (280 words)

	A CBC Stream Cipher in C# (With wrappers for two open source AES implementations in C# and C) - The Code Project - .NET
		A CBC Stream Cipher in C# (With wrappers for two open source AES implementations in C# and C) By Vasian Cepa.
		AES is symmetric block cipher algorithm, which means that the same key is use for encryption and decryption.
		The stream cipher library I implemented does not offer a way to create a salt or an IV, given that different applications may use different ways to generate and distribute them.
	www.codeproject.com /dotnet/csstreamcipher.asp (2389 words)

	Stream cipher - CryptoDox
		A stream cipher is a symmetric cipher where plaintext digits are encrypted one at a time, and in which the transformation of successive digits varies during the encryption.
		Some stream ciphers, such as the Enigma, combine a letter of the plaintext with a letter of the keystream using a Beaufort cipher function.
		If the "key stream" is generated independently of the plaintext or the ciphertext, and either the "xor" function or the "Beaufort cipher" function is used, then the cipher is a kind of reciprocal cipher.
	cryptodox.com /Stream_cipher (225 words)

	Stream cipher - Wikipedia, the free encyclopedia
		Stream ciphers can be viewed as approximating the action of a theoretically unbreakable cipher, the one-time pad (OTP), sometimes known as the Vernam cipher.
		Stream ciphers are often used in applications where plaintext comes in quantities of unknowable length—for example, a secure wireless connection.
		Block ciphers must be used in ciphertext stealing or residual block termination mode to avoid padding, while stream ciphers eliminate this issue by naturally operating on the smallest unit that can be transmitted (usually bytes).
	en.wikipedia.org /wiki/Stream_cipher (1515 words)

	Stream cipher
		A stream cipher is a cipher in which the input data are encrypted one bit (sometimes one byte) at a time.
		Stream ciphers represent a line of cipher development which is different from block cipher s although there are simple mathematical transformations that convert stream ciphers to block ciphers and vice versa.
		Stream ciphers are used in applications where plaintext comes in quantities of unknown length, for example, a secure wireless connection.
	www.nebulasearch.com /encyclopedia/article/Stream_cipher.html (414 words)

	Stream cipher (Site not responding. Last check: )
		In cryptography, a stream cipher is a cipher in which the input data are encrypted one bit (sometimes one byte) at a time.
		Stream ciphers represent a line of cipher development different from block ciphers, although there are mathematical transformations that convert stream ciphers into block ciphers and vice versa.
		Stream ciphers are used in applications where plaintext comes in quantities of unknowable length - for example, a secure wireless connection.
	www.xasa.com /wiki/en/wikipedia/s/st/stream_cipher.html (510 words)

	Stream cipher attack - Wikipedia, the free encyclopedia
		Stream ciphers where plaintext bits are combined with a cipher bit stream by an exclusive-or operation (xor) can be very secure if used properly.
		Stream ciphers are vulnerable to attack if the same key is used twice (depth of two) or more.
		One way to avoid this problem is to use an initialization vector (IV), sent in the clear, that is combined with a secret master key to create a one-time key for the stream cipher.
	en.wikipedia.org /wiki/Stream_cipher_attack (685 words)

	Stream cipher (Site not responding. Last check: )
		A stream cipher is a cipher in which the input data are encryptedone bit (sometimes one byte) at a time.
		Stream ciphers representa line of cipher development which is different from block ciphers althoughthere are simple mathematical transformations that convert stream ciphers to block ciphers and vice versa.
		Some ciphers, calledself-synchronizing stream ciphers, use several previous ciphertext bits to compute the keystream (as opposed tosynchronous stream ciphers, in which the keystream is generated independently of the plaintext and the ciphertext).
	www.therfcc.org /stream-cipher-72555.html (367 words)

	RSA Laboratories - 2.1.5 What is a stream cipher?
		Stream ciphers can be designed to be exceptionally fast, much faster than any block cipher (see Question 2.1.4).
		Such a cipher is said to offer perfect secrecy, and the analysis of the one-time pad is seen as one of the cornerstones of modern cryptography [Sha49].
		Stream ciphers were developed as an approximation to the action of the one-time pad.
	www.rsa.com /rsalabs/node.asp?id=2174 (516 words)

	RSA Security - 2.1.5 What is a stream cipher?
		Stream ciphers can be designed to be exceptionally fast, much faster than any block cipher (see Question 2.1.4).
		Such a cipher is said to offer perfect secrecy, and the analysis of the one-time pad is seen as one of the cornerstones of modern cryptography [Sha49].
		Stream ciphers were developed as an approximation to the action of the one-time pad.
	www.rsasecurity.com /rsalabs/node.asp?id=2174 (516 words)

	Lesson: Stream Ciphers
		The stream ciphers portion of the Crypto API is based upon the common stream interface in Java, with the familiar read and write function calls used to interact with the stream.
		Once a stream cipher is established, all activity is performed by the class on the underlying stream with no intervention or work required by the developer.
		Cipher Feedback (CFB) mode is a common mode used to convert a block cipher to a stream cipher.
	www.blackberry.com /developers/docs/4.0.2api/net/rim/device/api/crypto/doc-files/stream.html (709 words)

	ISO - International Organization for Standardization
		A stream cipher is an encryption mechanism that uses a keystream to encrypt a plaintext in bitwise or block-wise manner.
		A stream cipher is technically specified by choosing a keystream generator and a mode of stream ciphers.
		There are two types of stream cipher: a synchronous stream cipher, in which the keystream is only generated from the secret key (and an initialization vector) and a self-synchronizing stream cipher, in which the keystream is generated from the secret key and some past ciphertexts (and an initialization vector).
	www.iso.org /iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=39978 (163 words)

	Stream Cipher design postulates
		Stream cipher is the first wide-used cryptographic primitive, mainly for military proposes, but also having a wide commercial application.
		Opposite to Block Ciphers where the plaintext is run trough a sequence of key-determinate transformations, stream ciphers produce a bit-sequence independent of the plaintext.
		The stream cipher is an iterative function, the n-th output is defined in terms of the previous outputs and the current state.
	members.tripod.com /kbajalc/algo/sq/SCThesis/index.html (4293 words)

	Hybrid stream cipher - Patent 7003107
		The hybrid cipher of claim 4, wherein the second software routine further performs a second shuffling operation on the internal state of the computing device based on at least an internal identifier to mitigate a likelihood of prediction of the internal state of the computing device upon knowledge of the encryption key.
		The hybrid cipher of claim 6, wherein the third software routine determines an amount of random data elements distributed within the cipher text is programmable based on a percentage value entered by a user, or set based on an encryption key and an internal identifier and the internal state of the computing device.
		The hybrid cipher of claim 1 further comprising a third software routine to convert cipher text to plain text based on a table lookup using an array having data elements that are permuted to correspond to an inverse of an array of the internal state of the computing device.
	www.freepatentsonline.com /7003107.html (20490 words)

	RSA Security - 3.6.10 What are some other stream ciphers?
		The third approach is to attempt to relate the difficulty of breaking the stream cipher (where "breaking" means being able to predict the unseen keystream with a success rate better than can be achieved by guessing) to solving some difficult problem (see [BM84] [BBS86]).
		A recent example of a stream cipher designed by a system-theoretic approach is the Software-optimized Encryption Algorithm (SEAL), which was designed by Rogaway and Coppersmith in 1993 [RC93] as a fast stream cipher for 32-bit machines.
		VRA is described as a pseudo-random generator (see Question 2.5.2), not a stream cipher, but the two concepts are closely connected, since a pseudo-random generator can produce a (pseudo) one-time pad for encryption.
	www.rsasecurity.com /rsalabs/node.asp?id=2257 (468 words)

	What are block and stream ciphers?
		Stream ciphers encrypt plaintext one byte or one bit at a time.
		DES is a block cipher with a 64 bit block size.
		A5, the algorithm used to encrypt GSM communications, is a stream cipher.
	www.tech-faq.com /block-stream-cipher.shtml (175 words)

	SoftDesignz :: Encryption \| Stream Ciphers
		Stream ciphers can be designed to be exceptionally fast, much faster in fact than any block cipher.
		Current interest in stream ciphers is most commonly attributed to the appealing theoretical properties of the one-time pad, but there have been, as of yet, no attempts to standardize on any particular stream cipher proposal as has been the case with block ciphers.
		Stream ciphers were developed as an approximation to the action of the one-time pad, and while contemporary stream ciphers are unable to provide the satisfying theoretical security of the one-time pad, they are at least practical.
	www.softdesignz.com /streamciphers.asp (1048 words)

	rehpic
		Stream cipher cipher text can be manipulated easier and there is no error propagation.
		Speed : Stream ciphers tend to be faster than block ciphers and this happens because they applied on bot level and their complexity is less.
		Overhead : Stream ciphers have highr overhead than block cipher and this is usually dude to synchronisation parameters between sender and receiver.
	www.cipher.org.uk /index.php?p=course/Block_and_Stream_Ciphers.course (338 words)

	RSA Laboratories - 3.6.10 What are some other stream ciphers?
		The third approach is to attempt to relate the difficulty of breaking the stream cipher (where "breaking" means being able to predict the unseen keystream with a success rate better than can be achieved by guessing) to solving some difficult problem (see [BM84] [BBS86]).
		A recent example of a stream cipher designed by a system-theoretic approach is the Software-optimized Encryption Algorithm (SEAL), which was designed by Rogaway and Coppersmith in 1993 [RC93] as a fast stream cipher for 32-bit machines.
		VRA is described as a pseudo-random generator (see Question 2.5.2), not a stream cipher, but the two concepts are closely connected, since a pseudo-random generator can produce a (pseudo) one-time pad for encryption.
	www.rsa.com /rsalabs/node.asp?id=2257 (468 words)

	Kryptographie FAQ: Frage 86: What is a Stream Cipher? (Site not responding. Last check: )
		Stream ciphers can be designed to be exceptionally fast, much faster in fact than any block cipher (see Question 54).
		Current interest in stream ciphers is most commonly attributed to the appealing theoretical properties of the one-time pad (see Question 93), but there have been, as yet, no attempts to standardize on any particular stream cipher proposal as has been the case with block ciphers (see Question 64).
		More information about stream ciphers and the various available algorithms can be found in almost any book on contemporary cryptography and in RSA Laboratories Technical Report [Rob95b].
	www.iks-jena.de /mitarb/lutz/security/cryptfaq/q86.html (300 words)

	Q86: What is a Stream Cipher? (Site not responding. Last check: )
		A stream cipher is a symmetric encryption algorithm.
		A stream cipher generates what is called a keystream and encryption is provided by combining the keystream with the plaintext, usually with the bitwise exclusive-or operation.
		The generation of the keystream can be independent of the plaintext and ciphertext (yielding what is termed a synchronous stream cipher) or it can depend on the data and its encryption (in which case the stream cipher is said to be self-synchronizing).
	www.x5.net /faqs/crypto/q86.html (258 words)

	Nicholas Allen's Indigo Blog : How Stream Ciphers Work (Site not responding. Last check: )
		Unlike block ciphers that operate on chunks of input text, a stream cipher operates on a byte-at-a-time basis using an input stream.
		Stream ciphers are very simple but have more obvious weaknesses than the block ciphers we looked at yesterday.
		Stream ciphers are susceptible to targeted tampering of the message because changes to the text are narrowly scoped.
	blogs.msdn.com /drnick/archive/2006/07/21/673607.aspx (544 words)

	RC4 Page
		The key stream generated by RC4 is a stream of pseudo-random bytes.
		Furthermore, these patterns propagate into the generated stream and consequently their occurrences (in the secret key) can be easily isolated by simple analysis of the stream (sometimes the ciphertext itself suffice).
		The IV weakness, is related to a popular mode of operation of stream ciphers, where in order to avoid reusing the key, it is combined with a known vector (denoted the initialization vector or the IV) and this combination is used as the seed to the key stream generator.
	www.wisdom.weizmann.ac.il /~itsik/RC4/rc4.html (1025 words)

	[No title]
		The state of the stream cipher is * filled with the IV value prior to encrypting any data from the input stream.
		* At each stage in the stream ciphering process, the state of the cipher is * represented by a block of data the same width as the block size of the * underlying block cipher.
		For each input word that is encrypted by the stream * cipher, the state block is encrypted using the block cipher and the encryption * key set up for the cipher.
	david.tribble.com /src/java/tribble/crypto/StreamCipherSpi.java (3247 words)

Try your search on: Qwika (all wikis)