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Topic: RC5 cipher

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	Ron Rivest's RC6 - New Cipher for AES
		RC5 was intentionally designed to be extremely simple, to invite analysis shedding light on the security provided by extensive use of data-dependent rotations.
		The philosophy of RC5 is to exploit operations (such as rotation) that are efficiently implemented on a modern processor.
		In RC5, the term "half-round" was used to describe this style of action, and an RC5 round was deemed to consist of two half-rounds.
	cryptome.sabotage.org /rc6.htm (1037 words)

	Informat.io on Rc5
		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.
		Distributed.net has brute-forced RC5 messages encrypted 56- and 64-bit keys, and is, as of October 2006, working on cracking a 72-bit key.
	www.informat.io /?title=rc5 (357 words)

	Mandragor & Apinc - Free Documentation Base (Site not responding. Last check: 2007-11-03)
		The RC5-CTS cipher is the Cipher Text Stealing mode of RC5, which handles plaintext of any length and the ciphertext length matches the plaintext length.
		The RC5 cipher was invented by Professor Ronald L. Rivest of the Massachusetts Institute of Technology in 1994.
		When RC5 is used as a 64 bit block cipher, B is 64 and W is 32.
	docs.mandragor.org /files/RFCs/20xx/2040 (4674 words)

	RC5 in perl5
		RC5 is a symmetric block cipher which encrypts in 8 byte blocks.
		RC5 is the subject of research at the moment, it is not a tried and trusted cryptosystem.
		RC5 has a variable sized key, and has a variable number of rounds.
	www.cypherspace.org /adam/rsa/rc5.html (816 words)

	One round two half rounds of the RC5 block cipher One...
		One round (two half-rounds) of the RC5 block cipher"One round (two half-rounds) of the RC5 block cipher" "RC5" is a block cipher block cipher notable for its simplicity.
		Unlike many schemes, RC5 has a variable block size block size (32, 64 or 128 bit bits), key size key size (0 to 2040 bits) and number of rounds (0 to 255).
		RC5 makes extensive use of data-dependent rotations, a relatively novel cryptographic operation — they were used previously only in Madryga Madryga — and combines them with modular modular addition and eXclusive OR (XOR) eXclusive OR (XOR) in a Feistel Feistel-like network.
	www.biodatabase.de /RC5 (369 words)

	The RSA Secret-Key Challenge
		RC5 is a fully parameterized block cipher, and twelve RC5 contests will be posted.
		As well as having a variable key size, RC5 also has a variable block size and a variable number of rounds; however, all the RC5 contests posted as part of the RSA Secret-Key Challenge will use 12-round RC5 with a 32-bit word size.
		The first RC5 contest will consist of some unknown plaintext encrypted using a 40-bit key; the second will consist of some unknown plaintext encrypted using a 48-bit key; and so forth to the twelfth contest, which will consist of some unknown plaintext message encrypted using a 128-bit key.
	www.fortify.net /related/97challenge.html (576 words)

	RFC 2040 - The RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS Algorithms
		The third cipher, RC5- CBC-Pad, handles plaintext of any length, though the ciphertext will be longer than the plaintext by at most the size of a single RC5 Baldwin and Rivest Informational [Page 1] RFC 2040 RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS October 1996 block.
		Baldwin and Rivest Informational [Page 4] RFC 2040 RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS October 1996 4.1 Creating an RC5 Key To create a key, the memory for the key object must be allocated and initialized.
		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.packetizer.com /rfc/rfc.cgi?num=2040 (4714 words)

	[No title]
		The symmetric cipher commands allow data to be encrypted or decrypted using various block and stream ciphers using keys based on passwords or explicitly provided.
		A beginner is advised to just use a strong block cipher in CBC mode such as bf or des3.
		All the block ciphers use PKCS#5 padding also known as standard block padding: this allows a rudimentary integrity or password check to be performed.
	www.ibiblio.org /gferg/ldp/man/man1/enc.1ssl.html (740 words)

	RFC 2040 -- The RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS Algorithms
		There is binding a key to a cipher object, setting a new initialization vector for a cipher object without changing the key, encrypting part of a message (this would be performed multiple times for long messages), and processing the last part of a message which
		The cipher object needs to keep track of the padding mode, the number of rounds, the expanded key, the initialization vector, the CBC chaining block, and an input buffer.
		Destroying the cipher object is the inverse of creating it with care being take to zero memory before returning it to the memory manager.
	www.columbia.edu /~ariel/ssleay/rfc2040.html (5136 words)

	RC5 - Wikipedia, the free encyclopedia
		The key schedule, however, is more complex, expanding the key using an essentially one-way function with the binary expansions of both e and the golden ratio as sources of "nothing up my sleeve numbers".
		Distributed.net has brute-forced RC5 messages encrypted with 56- and 64-bit keys, and is, as of December 3rd, 2002, working on cracking a 72-bit key.
		Biryukov A. and Kushilevitz E. Improved Cryptanalysis of RC5.
	en.wikipedia.org /wiki/RC5 (403 words)

	SSLeay 0.9.0b docs
		RC5 is a symmetric block cipher that can operate on varying word sizes, with a varying number of rounds.
		It can be regenerated from the RC5 key so it only needs to be kept when encryption or decryption is about to occur.
		For more information about the specific RC5 modes in this library (ecb, cbc, cfb and ofb), read the section entitled DES encryption modes overview.
	www.columbia.edu /~ariel/ssleay/rc5.html (834 words)

	RC algorithm - Wikipedia, the free encyclopedia
		RC2 was a 64-bit block cipher developed in 1987.
		RC5 is a 128-bit block cipher developed in 1994.
		RC6, based heavily on RC5, was an AES finalist developed in 1997.
	en.wikipedia.org /wiki/RC_algorithm (120 words)

	RFC2040 (Site not responding. Last check: 2007-11-03)
		RFC 2040 RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS October 1996 b This is the byte length of the secret key.
		RFC 2040 RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS October 1996 /* Convert a buffer from ascii hex to bytes.
		RFC 2040 RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS October 1996 [4] Rivest, Ronald L., "The MD5 Message-Digest Algorithm", RFC 1321.
	rfc.net /rfc2040.html (5200 words)

	01.29.97 - The only legally exportable cryptography level is totally insecure; UC Berkeley grad student breaks ... (Site not responding. Last check: 2007-11-03)
		RSA's RC5 cipher can however be used with longer keysizes, ranging from 40 to 2,048 bits, to provide increasing levels of security.
		The number of bits in a cipher is an indication of the maximum level of security the cipher can provide, Goldberg said.
		A recent panel of experts recommended using 90-bit ciphers, and 128-bit ciphers are commonly used throughout the world, but U.S. government regulations restrict exportable U.S. products to a mere 40 bits.
	www.berkeley.edu /news/media/releases/97legacy/code.html (475 words)

	RC5 - Gurupedia
		RC5 makes extensive use of data-dependent rotations, a relatively novel 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.
		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.gurupedia.com /r/rc/rc5.htm (272 words)

	Mailing list archive ipsec-mail4
		RC5 is a stream cipher that allows for variable length keys.
		Xref: Re: RC5 Background Information Perry E. Metzger Xref subject next Here is a short section from the informational RFC on the RC5 cipher.
		RC5 with 128 bit keys and 12 rounds meets requirements 1 and 3, and a 40 bit RC5 we hope will meet requirements 1 and 2 (so far no vendors has formally requested export of 40 bit RC5).
	www.cs.arizona.edu /projects/security/ipsec/ipsec-mail4.html (11606 words)

	SIGPC V1N22
		In symmetric cipher systems like DES the same key used to encode the plaintext is used to decode it.
		This type of attack can be used on block ciphers like DES by analyzing the evolution of the differences between two related plaintexts as they are encrypted using the same key.
		Nevertheless, in October RSA paid $10000 to a group called the Bovine RC5 Effort for cracking a message encrypted using the RC5 algorithm.
	www.sigpc.net /v1/n22.htm (1820 words)

	ENC
		All the block ciphers normally use PKCS#5 padding also known as standard block padding: this allows a rudimentary integrity or password check to be performed.
		ciphers have the same key and effective key length.
		rc5-cbc RC5 cipher in CBC mode rc5 Alias for rc5-cbc rc5-cfb RC5 cipher in CBC mode rc5-ecb RC5 cipher in CBC mode rc5-ofb RC5 cipher in CBC mode
	www.math.ucla.edu /computing/docindex/openssl-man-9.html (929 words)

	Linuxbroker - rfc2040.txt (Site not responding. Last check: 2007-11-03)
		The third cipher, RC5- CBC-Pad, handles plaintext of any length, though the ciphertext will be longer than the plaintext by at most the size of a single RC5 Baldwin & Rivest Informational [Page 1] RFC 2040 RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS October 1996 block.
		I[index] = I[index]; return (pAlg); } 7.2 Destroying cipher objects Destroying the cipher object is the inverse of creating it with care being take to zero memory before returning it to the memory manager.
		Key expansion could be an operation on keys, but that would not work correctly for ciphers that modify the expanded key as Baldwin & Rivest Informational [Page 14] RFC 2040 RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS October 1996 they operate.
	rfc.linuxbroker.com /rfcreader.php?file=rfc2040.txt (4171 words)

	RFC2040
		The third cipher, RC5- CBC-Pad, handles plaintext of any length, though the ciphertext will be longer than the plaintext by at most the size of a single RC5 block.
		There is binding a key to a cipher object, setting a new initialization vector for a cipher object without changing the key, encrypting part of a message (this would be performed multiple times for long messages), and processing the last part of a message which may add padding or check the length of the message.
		Key expansion could be an operation on keys, but that would not work correctly for ciphers that modify the expanded key as they operate.
	www.scit.wlv.ac.uk /rfc/rfc20xx/RFC2040.html (5539 words)

	Distributed.Net Team Deciphers Message Encrypted in RC5-64 eWEEK - Find Articles (Site not responding. Last check: 2007-11-03)
		A worldwide team of volunteers, using spare computing power, found the secret key for a message encrypted with the RC5-64 cipher late last month, winning a $10,000 prize and, they said, casting some doubt on the security of messages protected by the cipher.
		we can say with confidence that RC5 is not an appropriate algorithm to use for data that will still be sensitive in more than several years' time," the team said in a statement.
		The RC5 algorithm was designed by renowned cryptographer Ron Rivest, one of the three designers of the original RSA algorithm.
	www.findarticles.com /p/articles/mi_zdewk/is_200210/ai_ziff32071 (506 words)

	RC5 Background Information (Site not responding. Last check: 2007-11-03)
		Here is a short section from the informational RFC on the RC5 cipher.
		The third cipher, RC5-CBC-Pad, includes padding in the CBC mode to allow it to process inputs of any byte length.
		The terms RC5, RC5-CBC, RC5-CBC-Pad and assorted variations on these are trademarks.
	www.sandelman.ottawa.on.ca /ipsec/1996/03/msg00091.html (216 words)

	RSA Security - RC6® Block Cipher
		The RC6 block cipher was designed by Ron Rivest in collaboration with Matt Robshaw, Ray Sidney, and Yiqun Lisa Yin from RSA Laboratories.
		As part of the effort to find the successor to DES, RSA Laboratories submitted RC6 as a candidate for the Advanced Encryption Standard (AES).
		To promote RC6 further, RSA Laboratories has submitted the algorithm to the NESSIE project, the NP 18033 project (via the Swedish ISO/IEC JTC 1/SC 27 member body), and the Information-technology Promotion Agency in Japan.
	www.rsasecurity.com /rsalabs/node.asp?id=2512 (250 words)

	OpenSSL: Documents, openssl(1)
		The pseudo-commands list-standard-commands, list-message-digest-commands, and list-cipher-commands output a list (one entry per line) of the names of all standard commands, message digest commands, or cipher commands, respectively, that are available in the present openssl utility.
		The pseudo-commands list-cipher-algorithms and list-message-digest-algorithms list all cipher and message digest names, one entry per line.
		Since for each cipher there is a command of the same name, this provides an easy way for shell scripts to test for the availability of ciphers in the openssl program.
	www.openssl.org /docs/apps/openssl.html (632 words)

	Schizoid rc5 Crack Team
		RC5-32/12/5 (RC5 with 32-bit wordsize, 12 rounds, and 5*8=40-bit key)
		RC5-32/12/6 (RC5 with 32-bit wordsize, 12 rounds, and 6*8=48-bit key)
		RC5-32/12/7 (RC5 with 32-bit wordsize, 12 rounds, and 7*8=56-bit key)
	members.home.nl /dispatcher/rc5/hyp/progress.html (130 words)

	02.26.97 - This Cipher Was a Cinch (Site not responding. Last check: 2007-11-03)
		It took graduate student Ian Goldberg only three and a half hours to crack the most secure level of encryption that the government allows U.S. companies to export.
		In January, RSA Data Security Inc. challenged the world to decipher a message encrypted with its RC5 symmetric stream cipher, using a 40-bit key, the longest keysize allowed for export.
		RSA offered a $1,000 reward, designed to stimulate research and experience with the security of today's codes.
	www.berkeley.edu /news/berkeleyan/1997/0226/encrypt.html (410 words)

	openssl -- OpenSSL command line tool
		output a list (one entry per line) of the names of all standard commands message digest commands or cipher commands respectively that are available in the present
		XXX tests whether a command of the specified name is available.
		Since for each cipher there is a command of the same name this provides an easy way for shell scripts to test for the availability of ciphers in the
	www.mkssoftware.com /docs/man1/openssl.1.asp (481 words)

	openssl enc -- symmetric cipher routines
		option it is possible to perform efficient dictionary attacks on the password and to attack stream cipher encrypted data.
		Encrypt a file using triple DES in CBC mode using a prompted password:
		So if, for example, you want to use RC2 with a 76 bit key or RC4 with an 84 bit key you can't use this program.
	www.mkssoftware.com /docs/man1/openssl_enc.1.asp (744 words)

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