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Topic: Padding cryptography

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	Padding (cryptography) - Wikipedia, the free encyclopedia
		In public key cryptography, padding is the process of preparing a message for encryption or signing with a primitive such as RSA.
		A modern padding scheme aims to ensure that the attacker cannot manipulate the plaintext to exploit the mathematical structure of the primitive and will usually be accompanied by a proof, often in the random oracle model, that breaking the padding scheme is as hard as solving the hard problem underlying the primitive.
		Padding is appended to the final block in a predictable way that includes the total length of the message; this padding ensures that the final block is the right length, and is a key part of the security proof for this way of building hash functions, which is known as the Merkle-Damgård construction.
	en.wikipedia.org /wiki/Padding_(cryptography) (481 words)

	Padding - Wikipedia, the free encyclopedia
		Padding is also added to clothing for insulation or cushioning reasons.
		Cushioning padding is included in some sporting goods, especially those intended for use in combat sports (eg, fencing, some martial arts, etc).
		Garments intended for actual use in combat were once commonly padded (eg, by the ancient Greeks under armor, or by the Japanese until the mid-19th century), but have largely been replaced by light armor made of, for instance, Kevlar.
	en.wikipedia.org /wiki/Padding (263 words)

	Padding (cryptography)
		In cryptography, padding is the practice of adding material, generally to the plaintext of messages.
		And, a sort of padding has been suggested by Ronald Rivest to entirely conceal the existence of a ciphertext within a larger data sequence.
		The padding -- added to the end of the plaintext before encryption -- was, 'the world wonders'.
	www.sciencedaily.com /encyclopedia/padding__cryptography_ (472 words)

	Blank Mouse Pads -- Recommendations and Resources (Site not responding. Last check: 2007-10-07)
		In cryptography, the one-time pad (OTP) is the only theoretically unbreakable method of encryption: the plaintext is combined with a random "''pad''" the same length as the plaintext.
		The "pad" part of the name comes from early implementations of the key material as a pad of gummed paper (for easy concealment, the pad was often physically very small, e.g.
		However, it has drawbacks in practice: it requires perfectly random one-time pads, secure generation and exchange of the one-time pad material, which must be at least as long as the message; and careful treatment to make sure that it is disposed of correctly and never reused — hence "one time".
	www.becomingapediatrician.com /health/17/blank-mouse-pads.html (1608 words)

	Using Encryption in .NET - .NET Developers (Site not responding. Last check: 2007-10-07)
		Padding is extra data added to the end of the message to force the length to be an even multiple of the block size.
		The padding mode is set by assigning a value from the PaddingMode enumeration to the Padding property of an instance of the cipher.
		This padding mode fills out the last block of the message with a sequence of bytes, the value of each of which is equal to the total number of padding bytes.
	www.dotnetdevs.com /articles/UsingEncryption.aspx (5734 words)

	Asymmetric Cryptography (Site not responding. Last check: 2007-10-07)
		The second parameter is a boolean that indicates the padding mode to be used.
		Padding is required, since the data to be encrypted is usually not the exact number of required bits in length.
		Since the algorithm requires specific bit-sized blocks to process properly, padding is used to fill the input data to the desired length.
	www.informit.com /articles/article.asp?p=102212&seqNum=6 (2193 words)

	kaliski-pkcs5-v2-04.txt-67841.txt
		A general approach to password-based cryptography, as described by Morris and Thompson [8] for the protection of password tables, is to combine a password with a salt to produce a key.
		4.1 Salt A salt in password-based cryptography has traditionally served the purpose of producing a large set of keys corresponding to a given password, among which one is selected at random according to the salt.
		Encrypt the encoded message EM with the underlying block cipher (DES or RC2) in cipher block chaining mode under the encryption key K with initialization vector IV to produce the ciphertext C. For DES, the key K shall be considered as a 64-bit encoding of a 56-bit DES key with parity bits ignored (see [9]).
	ietfreport.isoc.org /idref/draft-kaliski-pkcs5-v2 (6700 words)

	Pantek - Expert Linux and Open Source Services: : RFC #2898: PKCS #5: Password-Based Cryptography Specification Version ...
		Kaliski Informational [Page 12] RFC 2898 Password-Based Cryptography September 2000 The length in octets of the encoded message will be a multiple of eight and it will be possible to recover the message M unambiguously from the encoded message.
		Output the ciphertext C. Kaliski Informational [Page 14] RFC 2898 Password-Based Cryptography September 2000 The salt S, the iteration count c, the key length dkLen, and identifiers for the key derivation function and the underlying encryption scheme may be conveyed to the party performing decryption in an AlgorithmIdentifier value (see Appendix A.4).
		B.2.3 RC2-CBC-Pad RC2-CBC-Pad is the RC2(tm) encryption algorithm [21] in CBC mode with the RFC 1423 padding operation.
	www.pantek.com /library/general/rfc/rfc2898.html (6614 words)

	Cryptohraphy in .NET: Encryption (Site not responding. Last check: 2007-10-07)
		Cryptography is the art and science of keeping messages secure.
		Cryptography algorithms (ciphers) are mathematical functions used for encryption and decryptions.
		For cryptography to be used in practical solutions algorithms used for encryption and decryption should be made public.
	www.vbdotnetheaven.com /Code/Jun2003/2002.asp (1736 words)

	[No title] (Site not responding. Last check: 2007-10-07)
		Padding Before encrypting random-length plaintext with a block cipher algorithm it needs to be padded to an exact multiple of the block length.
		The value of each byte of the padding string is set to the number of bytes added; namely, 8 bytes of value 0x08, 7 bytes of value 0x07,..., 2 bytes of 0x02, or one byte of value 0x01.
		If the decrypted padding byte at the end of the resulting output is in the expected range, the appropriate number of padding bytes will be removed; otherwise the output will be left as is and a non-zero error code will be returned.
	www.cryptosys.net /CryptoSysManual.txt (12597 words)

	Learning About Cryptography
		Cryptography can kill in the sense that boots can kill; that is, as a part of some other process, but that does not make cryptography like a rifle or a tank.
		Cryptography is only a small part of the protection needed for "absolute" secrecy.
		Cryptography deliberately creates the situation of "a needle in a haystack." That is, of all possible
	www.ciphersbyritter.com /LEARNING.HTM (7441 words)

	Java Cryptography Extension 1.2
		Cryptography Extension (JCE) 1.2 provides a framework and implementations for encryption, key generation and key agreement, and Message Authentication Code (MAC) algorithms.
		If no mode or padding have been specified, provider-specific default values for the mode and padding scheme are used.
		This make the padding scheme similar (but not quite) to PKCS5Padding, where the padding length is encoded in the padding (and ranges from 1 to block_length).
	crypto.stanford.edu /~dabo/courses/cs255_winter00/JCE-1.2.htm (7027 words)

	An Overview of Cryptography (Site not responding. Last check: 2007-10-07)
		Cryptography is the science of writing in secret code and is an ancient art; the first documented use of cryptography in writing dates back to circa 1900 B.C. when an Egyptian scribe used non-standard hieroglyphs in an inscription.
		With this form of cryptography, it is obvious that the key must be known to both the sender and the receiver; that, in fact, is the secret.
		Second, padding may be required to ensure that the ESP packet and resulting ciphertext terminate on a 4-byte boundary.
	www.garykessler.net /library/crypto.html (17397 words)

	Create a Simple, Reusable Infrastructure for Public Key Encryption Using VB.NET
		If the input array has fewer bytes and doesnt use the entire key, padding is used so that the output is always the same length and depends only on the size of the key.
		The type of padding employed depends on the operating system—and a minimum amount of padding may be applied to each block.
		Windows XP and later support 'OAEP padding (PKCS#1 v2)' in which the minimum amount of padding applied to each encrypted block depends upon the size of the key and the size of the hash (message digest).
	www.devx.com /security/Article/17249/0/page/3 (1037 words)

	Amazon.com: Java Cryptography Extensions : Practical Guide for Programmers (The Practical Guides): Books: Jason Weiss (Site not responding. Last check: 2007-10-07)
		But considerations for cryptography must be made early on in the design process and its imperative that developers know what kinds of solutions exist.
		In Java Cryptography Extensions (JCE), cryptography is discussed at the level that developers need to know to work with the JCE and with their own applications but that doesnt overwhelm by packing in details unimportant to the busy professional.
		I have a theoretical background in cryptography, but often had to read the text many times over before I could understand what the author was trying to say.
	www.amazon.com /exec/obidos/tg/detail/-/0127427511?v=glance (1501 words)

	Financial Cryptography: Collision Search Attacks on SHA1 - the Shandong note
		As far as the padding issue, it is perfectly normal for them not to include the final padding.
		This should not be interpreted as meaning that the attack does not apply to full SHA-1 just because of that comment about the padding, "Note that padding rules were not applied to the messages." They are simply pointing to a detail of how they present their results.
		It says that "Note that padding rules were not applied to the message." This is exactly the same as the previous breaks; it just means that the collision appears in the chaining output...
	www.financialcryptography.com /mt/archives/000357.html (1829 words)

	McGraw-Hill Education Europe (Site not responding. Last check: 2007-10-07)
		Nigel Smart's Cryptography provides the rigorous detail required for advanced cryptographic studies, yet approaches the subject matter in an accessible style in order to gently guide new students through difficult mathematical topics.
		Covering the latest developments in computer cryptography, including the Rijndael algorithm chosen for the new Advanced Encryption Standard, the OAEP padding system for RSA and modern stream ciphers, this book is a complete introduction to cryptography.
		Cryptography incorporates practical examples and real-world case studies to examine strategies for security in multiple languages and various contexts.
	www.mcgraw-hill.co.uk /html/0077099877.html (443 words)

	Padding and Bijection
		The problem is the so called standard padding schemes suck and to stick ones head in the sand and use no new padding schemes that are better while allowing underlying block encryption progrmas to chane is stupid.
		The problems of padding scheme of appending a 1 and padding with 0s to the end of the block is the topic under discussion I believe.
		The bytes and bits of the padding could be all 0s, or all 1s, or generated from a PRBG, or from a TRBG; regardless, the amount of padding depends entirely (100%) on the length of the original message, not on the output of the bit generator.
	www.ciphersbyritter.com /NEWS6/PADDING.HTM (14688 words)

	RijndaelCryptoServiceProvider.Padding Property (Site not responding. Last check: 2007-10-07)
		The padding mode used in the symmetric algorithm.
		When this happens, a padding string is added to the text.
		The padding mode is not one of the PaddingMode values.
	www.mentalis.org /soft/projects/seclib/docs/Org.Mentalis.Security.Cryptography.RijndaelCryptoServiceProvider.Padding.html (98 words)

	Java Cryptography Extension
		Cryptography Extension (JCE) provides a framework and implementations for encryption, key generation and key agreement, and Message Authentication Code (MAC) algorithms.
		OAEPWithAndPadding: Optimal Asymmetric Encryption Padding scheme defined in PKCS #1, where should be replaced by the message digest and by the mask generation function.
		In the case of JCE, the "resources" are cryptography algorithms, and code sources do not need to be specified, because the cryptographic restrictions apply to all code.
	java.sun.com /j2se/1.4/docs/guide/security/jce/JCERefGuide.html (11048 words)

	Cryptography Software Code in Visual Basic and C
		Using keys in cryptography a brief introduction to keys and passwords in cryptography.
		Using padding in cryptography a 'how to' article decribing everything you need to know about padding with encryption algorithms.
		Our Using Padding in Cryptography article describes in detail the machanics of padding with examples using common block encryption algorithms like DES, Triple DES, Blowfish and AES.
	www.di-mgt.com /crypto.html (4266 words)

	PaddingMode Enumeration
		Specifies the type of padding to apply when the message data block is shorter than the full number of bytes needed for a cryptographic operation.
		The PKCS #7 padding string consists of a sequence of bytes, each of which is equal to the total number of padding bytes added.
		For example, if 24 bits (3 bytes) of padding need to be added, the padding string is "03 03 03".
	msdn.microsoft.com /library/en-us/cpref/html/frlrfSystemSecurityCryptographyPaddingModeClassTopic.asp?frame=true (219 words)

	Java Cryptography Extension 1.2
		A transformation is a string that describes the operation (or set of operations) to be performed on the given input, to produce some output.
		A transformation is of the form: "algorithm" or "algorithm/mode/padding" (in the former case, defaults are used for mode and padding).
		Standard names to be used to specify the algorithm, mode, and padding components of a transformation are discussed in Appendix A in this document.
	www.cs.unc.edu /Courses/wwwp-s98/members/sthapit/lec1/JceSpec.html (3563 words)

	Financial Cryptography: Shandong team attacks SHA-1
		Luckily, there are a few thinking blogs out there: Scott's stuff, and Rick's crypto blog is thinking on how to wrap the hash.
		Those rumours have been debunked, the padding issue is irrelevant.
		Most applications don't need collision resistance (as usually defined, with random inputs), but rely more on pre-image resistance and second pre-image resistance with one fixed known pre-image (example a document and its hash).
	www.financialcryptography.com /mt/archives/000355.html (1078 words)

	perl.com: Symmetric Cryptography in Perl
		Twofish cannot operate on anything less than a 16-byte block, so padding must be added to the end of the last block to make it 16 bytes long.
		NULs (\000) are usually used to pad the block, but the value used doesn't matter, because the padding is removed after the ciphertext is decrypted.
		This is really all we need for symmetric cryptography in Perl.
	www.perl.com /pub/a/2001/07/10/crypto.html (960 words)

	discuss@bloom-picayune: [14238] in cryptography@c2.net mail archive
		Although it first gained widespread publicity in the SSHv1 attacks, the fact that this mechanism is insecure and shouldn't be used goes back to (at least) Kerberos v4 dating from the 1980s (the des-cbc-crc mechanism was deprecated in Kerberos v5, the now ten-year-old RFC 1510).
		In addition, the inability to pad to more than one (64-bit) cipher block length makes it impossible to disguise message lengths by padding messages to a fixed size (there are further SSHv1 attacks that arose from similar problems there).
		That's raw bit strings, there's no PKCS #1 or OAEP padding, and the server is happy to act as an oracle for you too.
	diswww.mit.edu /bloom-picayune/crypto/14238 (2189 words)

	Java Cryptography Extension
		In JDK 5.0, new parameter classes have been added to fully support OAEP padding and the existing PSS parameter class was enhanced with APIs to fully support RSA PSS signature implementations.
		If no mode or padding is specified, provider-specific default values for the mode and padding scheme are used.
		This padding for block ciphers is described in 5.2 Block Encryption Algorithms in the W3C's "XML Encryption Syntax and Processing" document.
	java.sun.com /j2se/1.5.0/docs/guide/security/jce/JCERefGuide.html (10410 words)

	RSACryptoServiceProvider Class
		RSA.ImportParameters(RSAKeyInfo); //Encrypt the passed byte array and specify OAEP padding.
		//OAEP padding is only available on Microsoft Windows XP or //later.
		RSA.ImportParameters(RSAKeyInfo); //Decrypt the passed byte array and specify OAEP padding.
	msdn.microsoft.com /library/en-us/cpref/html/frlrfsystemsecuritycryptographyrsacryptoserviceproviderclasstopic.asp?frame=true (918 words)

	[No title]
		For such algorithms, the method shall be to pad the input at the trailing end with k - (l mod k) octets all having value k - (l mod k), where l is the length of the input.
		Blocksize is to large!" # construct padding padding = "" for i in range(int(padlength)): # pad number of chars as "leftover" chars padding += chr(int(padlength)) # paddmsg to add to origingal message # return
		Pad the message to nearest block, using pad().
	www.gnist.org /~lars/code/blackbox/blackbox.py (1623 words)

	CryptoSys API Manual v3.0
		Before encrypting random-length plaintext with a block cipher algorithm it needs to be padded to an exact multiple of the block length.
		For a 64-bit block size: Append a padding string of between 1 and 8 bytes to make the total length an exact multiple of 8 bytes.
		The PKCS#5/RFC3369 method of padding is used as specified in Section 6.3 of [RFC3369].
	www.cryptosys.net /CryptoSysManual.html (8909 words)

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