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Topic: RC5 encryption algorithm

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	[No title]
		We provide a variety of parameter settings so that users may select an encryption algorithm whose security and speed are optimized for their application, while providing an evolutionary path for adjusting their parameters as necessary in the future.
		It may be considered unusual and risky to specify an encryption algorithm that permits insecure parameter choices.
		The RC5 encryption speeds obtainable are yet to be fully determined.
	www.dia.unisa.it /~ads/corso-security/www/rc5.tex.txt (2193 words)

	RC5 - Wikipedia, the free encyclopedia
		RC5 is a block cipher notable for its simplicity.
		A key feature of RC5 is the use of data-dependent rotations; one of the goals of RC5 was to prompt the study and evaluation of such operations as a cryptographic primitive.
		The tantalising simplicity of the algorithm together with the novelty of the data-dependent rotations has made RC5 an attractive object of study for cryptanalysts.
	en.wikipedia.org /wiki/RC5 (365 words)

	RC5 encryption algorithm
		RC5 is a block cipher designed by Ronald Rivest.
		It has a variable block size (32, 64 or 128 bits), key size (0 to 2040) and number of rounds (0 to 255).
		Distributed.net has brute-forced messages encrypted with RC5 in 56 and 64 bit keys, and is currently working on finding a 72 bit key.
	www.ebroadcast.com.au /lookup/encyclopedia/rc/RC5_cipher.html (131 words)

	RC5 - the free encyclopedia (Site not responding. Last check: 2007-10-30)
		Unlike many schemes, RC5 has a variable blocksize (32, 64 or 128 bits), key size (0 to2040 bits) and number of rounds (0 to 255).
		A key feature of RC5 is the use of data-dependent rotations; one of the goals of RC5 was to prompt the study and evaluation ofsuch operations as a cryptographic primitive.
		The encryption and decryptionroutines can be specified in a few lines of code, although the key schedule is more complex.
	www.encyclopedia-of-knowledge.com /?t=RC5 (330 words)

	RC5 [Definition]
		RC5 also consists of a number of modular Modular arithmetic is a modified system of arithmetic for integers, sometimes referred to as "clock arithmetic", where numbers "wrap around" after they reach a certain value (the modulus).
		Serious weaknesses have since been found in the algorithm, but it was one of the first encryption algorithms to make use of data-dependent rotations, later used in other ciphers, such as RC5 and RC6....
		AES In cryptography, the Advanced Encryption Standard (AES), also known as Rijndael, is a block cipher adopted as an encryption standard by the US government, and is expected to be used worldwide and analysed extensively, as was the case with its predecessor, the Data Encryption Standard (DES).
	www.wikimirror.com /RC5 (2541 words)

	RFC 2409 (Site not responding. Last check: 2007-10-30)
		Requests for assignment of new encryption algorithm values must be accompanied by a reference to a standards-track or Informational RFC or a reference to published cryptographic literature which describes this algorithm.
		In phase 1, material for the initialization vector (IV material) for CBC mode encryption algorithms is derived from a hash of a concatenation of the initiator's public Diffie-Hellman value and the responder's public Diffie-Hellman value using the negotiated hash algorithm.
		In phase 2, material for the initialization vector for CBC mode encryption of the first message of a Quick Mode exchange is derived from a hash of a concatenation of the last phase 1 CBC output block and the phase 2 message id using the negotiated hash algorithm.
	www.freesoft.org /CIE/RFC/bynum.cgi?2409 (9997 words)

	RC5 (Site not responding. Last check: 2007-10-30)
		RC5 is a block cipher notable for its simplicity.Designed by Ronald Rivest in 1994, RC stands for "Rivest Cipher", oralternatively, "Ron's Code" (compare RC2, RC4).
		RC5 makes extensive use of data-dependent rotations, a relatively novel cryptographic operation — they were usedpreviously only in Madryga —; and combines them with modular addition and eXclusive OR(XOR) in a Feistel -like network.
		Distributed.net has brute-forced messages encrypted with RC5 in 56- and 64-bit keys, andis currently working on finding a 72-bit key.
	www.therfcc.org /rc5-221220.html (303 words)

	Rc5 Encryption Algorithm (Site not responding. Last check: 2007-10-30)
		This document describes the RC encryption algorithm, a fast symmetric block cipher suitable for hardware or software implementations...
		This document describes the RC encryption algorithm a...
		RC5 Data Encryption Algorithm Specified to Be Used in WTLS Clients and Servers BEDFORD, Mass...
	www.security-directory-4u.com /rc5-encryption-algorithm.html (405 words)

	DNS \| Security Encryption Strength
		The strength of an encryption algorithm is related to two factors.
		The RC5 algorithm was developed by RSA Data Security, Inc. The Secure ICA Option Pack uses the RC5 algorithm to encrypt ICA packets.
		The RC5 algorithm is a symmetric key algorithm.
	www.dns-ny.com /encrypt.htm (1023 words)

	RC5 - Indopedia, the Indological knowledgebase
		RC5 makes extensive use of data-dependent rotations, a relatively unusual cryptographic operation — they were used previously only in Madryga — and combines them with modular addition and eXclusive OR (XOR) in a Feistel -like network.
		The encryption and decryption routines can be specified in remarkably few lines of code, though the key schedule is more complex.
		RSA Security, who have a patent on the algorithm, offer a series of US$10,000 prizes for breaking a ciphertext encrypted with RC5.
	www.indopedia.org /RC5.html (385 words)

	RC5@Everything2.com
		RC5 is also a protocol for infrared remote control, invented by Philips.
		The RC5 family of algorithms was devised by Ronald L. Rivest, one of the cryptographers behind RSA.
		One of the more interesting features of this algorithm is that it was apparently one of the first to use a data dependent rotation, where one of word of the intermediate results is rotated by and amount dependent on another intermediate result.
	www.everything2.com /index.pl?node=RC5 (785 words)

	Cryptographic Algorithms: Block and Stream Ciphers, Hash Algorithms. Kremlin Encrypt Security Software: Encrypt and ...
		RC5 is a group of algorithms designed by Ron Rivest of RSA Data Security that can take on a variable block size, key size, and number of rounds.
		The studies of RC5 found that not all bits of data are used to determine the rotation amount (rotation is used extensively in RC5); RC6 uses multiplication to determine the rotation amount and uses all bits of input data to determine the rotation amount, strengthening the avalanche effect.
		Tiger is a new hash algorithm by Ross Anderson and Eli Biham.
	kremlinencrypt.com /algorithms.htm (3164 words)

	WAP Forum Specifies RSA Security's RC5(TM) Encryption For Wireless Environments
		RC5 Data Encryption Algorithm Specified to Be Used in WTLS Clients and Servers BEDFORD, Mass., April 20 /PRNewswire/ -- RSA Security Inc. (Nasdaq: RSAS) today announced that the WAP Forum has specified RSA Security's RC5(TM) encryption algorithm for its WTLS (Wireless Transport Level Security) specification.
		RSA Security's RC5 algorithm is the only data encryption algorithm that is specified as "should be supported by all WTLS clients and servers" by the WAP Forum for WTLS environments.
		The algorithm is designed for wireless applications, incorporating a lightweight and efficient protocol that conserves bandwidth, memory and processing power "Security will be an essential factor as WAP evolves to become the global standard for wireless Internet access," said Scott Goldman, CEO of WAP Forum.
	www.prnewswire.com /cgi-bin/stories.pl?ACCT=104&STORY=/www/story/04-20-2000/0001196494&EDATE= (482 words)

	Dr. Dobb's \| The RC5 Encryption Algorithm \| January 1, 1995
		For example, RC5-32/16/7 is an RC5 algorithm with the number of rounds and the length of key equivalent to DES.
		For encryption, we assume that the input block is given in two w-bit registers, A and B, and the ouput is also placed in the registers A and B.
		A distinguishing feature of RC5 is its heavy use of data-dependent rotations--the amount of rotation performed is dependent on the input data, and is not predetermined.
	www.ddj.com /showArticle.jhtml?documentID=ddj9501f&pgno=1 (803 words)

	The RC5 Encryption Algorithm
		This document describes the RC5 encryption algorithm, a fast symmetric block cipher suitable for hardware or software implementations.
		A novel feature of RC5 is the heavy use of data-dependent rotations.
		RC5 has a variable word size, a variable number of rounds, and a variable-length secret key.
	www.windowsecurity.com /whitepapers/The_RC5_Encryption_Algorithm.html?printversion (216 words)

	Hackers Center : Ethical Hacker Course by Doz
		RC4 Rivest Cipher 4 is a stream-based cipher.
		RC5 Rivest Cipher 5 is a block-based cipher.
		Like RC5, RC6 is a parameterized algorithm where the block size, the key size, and the number of rounds are variable; again, the upper limit on the key size is 2040 bits.
	www.hackerscenter.com /hacker/encryption.asp (5400 words)

	OpenSSL: Documents, EVP_EncryptInit(3)
		It should be set to 1 for encryption, 0 for decryption and -1 to leave the value unchanged (the actual value of 'enc' being supplied in a previous call).
		By default encryption operations are padded using standard block padding and the padding is checked and removed when decrypting.
		RC5 encryption algorithm in CBC, ECB, CFB and OFB modes respectively.
	www.openssl.org /docs/crypto/EVP_EncryptInit.html (2292 words)

	Distributed.Net - "Personal Super Computer"
		The RC5-64 encryption algorithm uses a 64 bit key to encode the plain text into cipher text.
		The RC5 algorithm is a successor to RC4 (typically 40 bit key) which is commonly found in non-USA versions of web browers.
		Another reason is that by continously showing current encryption technology is vulnerable to bruteforce attacks, new and improved encryption algorithms will be developed.
	saturn.cs.unp.ac.za /~michaelm/rc5.html (727 words)

	[No title]
		In the next section, a brief description of algorithm is provided, followed by description of the Java program, the various classes developed for this purpose, their role in the algorithm.
		RC5 Features RC5 algorithm is a symmetric block cipher, which means it uses same key for encryption and decryption and it operates on blocks of data.
		One key advantage of RC5 compared to other similar algorithms like DES is that it is easy to trade off between complexity and security by varying the word size, key size and the number of rounds.
	www.mcs.csuhayward.edu /~pwong/cs6520/rc5.doc (1238 words)

	[No title] (Site not responding. Last check: 2007-10-30)
		RC5 is interesting because of its simplicity, its speed and its variability.
		The algorithm RC5 -------------------- A detailed description of RC5 can be found in: ftp.rsa.com/pub/rc5/rc5.ps (or send mail to rc5-paper@rsa.com) ftp.cert.dfn.de/pub/virus/texts/crypto/rc5.zip Therefore, the procedure will only be sketched here.
		The algorithm that generates the key field is strongly mixing and different from the RC5 round operation.
	ftp.uni-nuernberg.de /pub/unix/cert-tools/crypt/RC5-IFW/rc5a.txt (1544 words)

	Cryptography and Python
		There are two classes of cryptographic algorithms: the innumerable ones that are proposed, and the few ones that are actually used.
		New algorithms are constantly being invented, but relatively few of them become part of the security engineer's toolchest, and there's no point in trying to implement every single one of them.
		However, a complete implementation is probably impossible, because it uses the RC2 encryption algorithm, which is proprietary to RSA Data Security, Inc., and has not been publicly described.
	www.python.org /workshops/1995-05/pct.html (1435 words)

	RFC 2040 (rfc2040) - The RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS Algorithms
		The RC5 cipher was invented by Professor Ronald L. Rivest of the Massachusetts Institute of Technology in 1994.
		The expansion algorithm uses two constants that are derived from the constants, e, and phi.
		For RC5 with 12 rounds, the key setup time and data encryption time are the same for all key lengths less than 832 bits, so there is no performance reason for choosing short keys.
	www.faqs.org /rfcs/rfc2040.html (4590 words)

	ECE 573 Project: The RC5 Encryption Algorithm (Site not responding. Last check: 2007-10-30)
		An RC5 algorithm is typically represented as RC5-w/r/b.
		The primary goal of the RC5 project is to do a survey on the RC5 algorithm, specifically looking at its strengths and weaknesses.
		The algorithm is fairly simple so that we will not have much trouble implementing it and running our own tests to see how it works.
	security.ece.orst.edu /koc/ece575/97Project/Sadagopan+Shah.html (178 words)

	[No title]
		Requests for assignment of new encryption algorithm values must be accompanied by a reference to a standards-track or Informational RFC or a reference to published cryptographic literature which describes this algorithm.
		In phase 1, material for the initialization vector (IV material) for CBC mode encryption algorithms is derived from a hash of a concatenation of the initiator's public Diffie-Hellman value and the responder's public Diffie-Hellman value using the negotiated hash algorithm.
		In phase 2, material for the initialization vector for CBC mode encryption of the first message of a Quick Mode exchange is derived from a hash of a concatenation of the last phase 1 CBC output block and the phase 2 message id using the negotiated hash algorithm.
	www.unix-ag.uni-kl.de /~massar/vpnc/docs/rfc2409.txt (7987 words)

	Data encryption in UniData and UniVerse
		Encryption is the process of converting data from its original form, called the "plaintext," to an unreadable form, the "ciphertext," through the application of an algorithm called a cipher.
		Sender and receiver use a public key algorithm to negotiate and exchange a mutually acceptable secret key; that key is then used with a symmetric key algorithm to transmit messages between the two.
		Implementing encryption at the application level allows developers to specify which fields are to be encrypted, thus limiting the performance impact of securing data with encryption.
	www.ibm.com /developerworks/db2/library/techarticle/dm-0601winter/index.html (6536 words)

	U2 encryption in an open technology world
		While encryption has been used to protect communications for as long as open messages have existed, only organizations and individuals with a need for secrecy have made use of it.
		If your key to the encryption is secure, and the strength of the cipher used is strong (number of bits used to encrypt data), then the encrypted cipher data will not be easily read by eavesdroppers.
		A seed value is used in the encryption of a plaintext password to expand the number of possible resulting cipher texts from a given plaintext.
	www.ibm.com /developerworks/db2/library/techarticle/dm-0604kesic (3839 words)

	RIM Device Java Library: Class WTLSCipherSuites (Site not responding. Last check: 2007-10-30)
		This method checks to see if the encryption algorithm passed into this method is considered to be of export strength.
		This method returns the default algorithms with their default priority keeping the security of the ciphersuites in mind at all times.
		This method returns the default MAC Algorithms with their default priority keeping the security of the ciphersuites in mind at all times.
	www.blackberry.com /developers/na/java/doc/api/net/rim/device/api/crypto/tls/wtls20/WTLSCipherSuites.html (3762 words)

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