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Topic: ID based cryptography


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In the News (Thu 24 Dec 09)

  
  Category:Cryptography - Wikipedia, the free encyclopedia
Cryptography is, traditionally, the study of ways to convert information from its normal, comprehensible form into an obscured guise, unreadable without special knowledge — the practice of encryption.
Cryptography has come to be in widespread use by many civilians who may not have extraordinary needs for secrecy (at least by governmental standards).
Cryptography has come to be often transparently built into the infrastructure for computing and telecommunications; users may not even be aware of it in some cases.
en.wikipedia.org /wiki/Category:Cryptography   (189 words)

  
 Learn more about Cryptography in the online encyclopedia.   (Site not responding. Last check: 2007-10-21)
Although cryptography has a long and complex history, it wasn't until the 19th century that it developed anything more than ad hoc approaches to either cryptanalysis (eg, Charles Babbage's Crimean War era work on mathematical cryptanalysis of polyalphabetic cyphers, repeated publicly rather later by the Prussian Kasiski) or encryption.
Cryptography, cryptanalysis, and secret agent betrayal featured in the Babington plot during the reign of Queen Elizabeth I which led to the execution of Mary, Queen of Scots.
Cryptography, and its misuse, was involved in the plotting which led to the execution of Mata Hari and even more reprehensibly in the travesty which led to Dreyfus' conviction and imprisonment, both in the early 20th century.
www.onlineencyclopedia.org /c/cr/cryptography_1.html   (4042 words)

  
 ID-based cryptography - Wikipedia, the free encyclopedia
ID-based cryptography (or identity-based cryptography or identity-based encryption) is a key authentication system in which the public key of a user is some unique information about the identity of the user (e.g.
The most efficient identity-based encryption schemes are currently based on bilinear pairings on elliptic curves, such as the Weil or Tate pairings.
The Cocks IBE scheme is based on well-studied assumptions (the quadratic residuosity assumption) but encrypts messages one bit at a time with a high degree of ciphertext expansion.
en.wikipedia.org /wiki/ID-based_cryptography   (651 words)

  
 Encryption - Wikipedia, the free encyclopedia
In cryptography, encryption is the process of obscuring information to make it unreadable without special knowledge.
Historically, cryptography was split into a dichotomy of codes and ciphers, and coding had its own terminology, analogous to that for ciphers: "encoding, codetext, decoding" and so on.
Algorithms used earlier in the history of cryptography are substantially different from modern methods, and modern ciphers can be classified according to how they operate and whether they use one or two keys.
en.wikipedia.org /wiki/Encryption   (765 words)

  
 Secure key issuing cryptography - Wikipedia, the free encyclopedia
Secure key issuing is variant of ID-based cryptography that reduces the level of trust that needs to be placed in a trusted third party by spreading the trust across multiple third parties.
Once the user gets the key they (and only they) can unblind it and retrieve their full private key, after which point the system becomes the same as identity based cryptography.
If all of the third parties cooperate they can recover the private key, so key escrow problems arise only if all of the third parties are untrustworthy.
en.wikipedia.org /wiki/Secure_key_issuing_cryptography   (228 words)

  
 [No title]
As is generally the case with public key cryptography, the security of the systems is based on the difficulty of solving a hard number theory problem, such as factoring or a discrete log (or Diffie- Hellman) problem.
The algorithm id list MUST contain all the algorithms supported by the CN that were included in the list sent by the MN in ABKp1, for which the version number of the parameters cached by the CN does not match that send by the MN.
Id: The two byte algorithm identifier for the algorithm to be used by the CN to encrypt E. Okazaki, S. Informational [Page 22] Internet Draft Securing BUs July, 2002 Length of Encrypted Key: The length, in bytes, of the encrypted session key.
www.math.uci.edu /~asilverb/bibliography/mobileip   (7064 words)

  
 Encyclopedia: ID-based cryptography
ID-based cryptography (or identity based cryptography or identity based encryption) is a key authentication system in which the public key of a user is some unique information about the identity of the user (e.g.
PKC, see PKC (disambiguation) Public-key cryptography is a form of modern cryptography which allows users to communicate securely without previously agreeing on a shared secret key.
In mathematics, the Weil pairing is a construction of roots of unity by means of functions on an elliptic curve E, in such a way as to constitute a pairing (bilinear form, though with multiplicative notation) on the torsion subgroup of E. The name is for André Weil, who gave...
www.nationmaster.com /encyclopedia/ID_based-cryptography   (595 words)

  
 RFC 2898 (rfc2898) - PKCS #5: Password-Based Cryptography Specification Ve
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.
As in PKCS #5 v1.5, the password-based encryption schemes here are based on an underlying, conventional encryption scheme, where the key for the conventional scheme is derived from the password.
In a password-based key derivation function, the base key is a password and the other parameters are a salt value and an iteration count, as outlined in Section 3.
www.faqs.org /rfcs/rfc2898.html   (6585 words)

  
 Cryptography
Unfortunately, they seem to abandoning some key features of any cryptography program, and that is the ability of the user to ensure that the program does what it claims to do and does not insert any foreign security weakening material.
RSA is a cypher based on the concept of a trapdoor function.
Cryptography is bought precisely because of a lack of trust of others by the purchaser, and this lack of trust should also extend to the manufacturer of the cryptographic engines.
www.pelttech.com /security/crypto.htm   (4772 words)

  
 Cryptography-based Patient Identifier
Based on the identification information, a digital certificate is issued to each individual which can be in the form of a smart card.
The cryptography based method is popular in the financial industry and it is used mainly to facilitate secure electronic transactions over computer networks.
His concept of ID Server, issuing authority, centralized and decentralized use, etc. need to be developed further to fully understand the characteristics of the Cryptography-based Patient Identifier.
www.ncvhs.hhs.gov /app7-4.htm   (4518 words)

  
 Based cryptography id   (Site not responding. Last check: 2007-10-21)
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www.islandwebsecurity.com /1000/based-cryptography-id.htm   (603 words)

  
 Roger Clarke's Chip-Based ID
ID chips are already being directly implanted in animals, commonly in the ear or the neck of valuable ones like pets and breeding stock.
The initial applications of chip-based ID in Anglo-American and European countries appear likely to be to institutionalised people, who are expensive to administer, and whose human rights are in any case subject to greater than usual qualifications.
A special case of a multi-purpose id scheme is what is usefully described as an 'inhabitant registration scheme'.
www.anu.edu.au /people/Roger.Clarke/DV/IDCards97.html   (5450 words)

  
 Enigma Variations : Abstracts
Based on our adaptively secure Feldman VSS scheme, we construct the first discrete-log key generation protocol (in the non-erasure model) which is adaptively secure and for which the simulator does not need to rewind the adversary.
Cryptographic workflow is a term coined by Paterson for the use of ID based cryptography in a system where the recipient encrypts to keys whose private component may not yet exist.
This scheme, based on an earlier scheme due to Chaum, has the surprising property that voters can confirm that their vote is accurately included in the tally, whilst at the same time preserving ballot secrecy.
www.cs.bris.ac.uk /Research/CryptographySecurity/seminars/abstracts.html   (9652 words)

  
 Project-Team-tanc   (Site not responding. Last check: 2007-10-21)
Elliptic curves in cryptography have first been used to replace finite fields in protocols whose security relies on the discrete logarithm problem, essentially keeping the protocols as they are and substituting one algebraic structure for another.
Another approach, less publicized, is that of identity based cryptography (ID), in which the public key of a user can be built very easily from his email address for instance.
This ID idea is not new, but no efficient and robust protocol was known prior to the ideas of Boneh et al.
www.inria.fr /rapportsactivite/RA2004/tanc2004/uid21.html   (558 words)

  
 Light Reading - Networking the Telecom Industry
Quantum Cryptography (QC) could change that by intrinsically securing key distribution based on fundamental laws of physics.
id Quantique, in collaboration with the University of Geneva, was the first company in the world to distribute an unbreakable key using a quantum cryptography system, an event which took place over a 67 km standard fibre-optic link between Geneva and Lausanne.
id Quantique is introducing the first quantum cryptography system, which exchanges keys over standard optical fibres.
www.lightreading.com /document.asp?site=lightreading&doc_id=41735   (479 words)

  
 TCS - Studies - T-79.515 Cryptography: Special Topics
Based on this disparity, cryptographers have lately proposed (literarily) many interesting cryptographic protocols that are considerably more efficient than the their previous counterparts.
We are going to base the seminar on Menezes's tutorial slides, and talk about one to three different papers during every seminar.
If necessary, the presenter must revise his or her survey, based on these remarks, within one week; the revised version will then be put on the web.
www.tcs.hut.fi /Studies/T-79.515/2003/index.shtml   (587 words)

  
 Welcome to Retep Open Source   (Site not responding. Last check: 2007-10-21)
It shall either be an octet string or an algorithm ID with an OID in the set PBKDF2-SaltSources, which is reserved for future versions of PKCS #5.
Some of the information may be carried elsewhere, e.g., in the encryption algorithm ID. However, such facilities are deferred to a future version of PKCS #5.
It shall be an algorithm ID with an OID in the set PBKDF2-PRFs, which for this version of PKCS #5 shall consist of id-hmacWithSHA1 (see Appendix B.1.1) and any other OIDs defined by the application.
www.retep.org.uk /retep/2898-19/rfc.do   (330 words)

  
 12th USENIX Security Symposium — Technical Paper
Using IBC in the signature and public-key based authentication modes for IKE Phase 1 is extremely straightforward.
While much of the work on identity-based cryptography has focused on the model where there is one global trust infrastructure, and one trusted IBC key generator, more recent work has begun to describe primitives that work with less restrictive trust models.
Using a domain-based approach, whether for IBC or even a traditional PKI, has the advantage that the things we are intending to authenticate are email senders and network hosts, whose identities derive directly from domains as structured in the DNS.
www.usenix.org /event/sec03/tech/full_papers/smetters/smetters_html   (9041 words)

  
 [No title]
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.
Encrypt the message M with the underlying encryption scheme under the derived key DK to produce a ciphertext C. (This step may involve selection of parameters such as an initialization vector and padding, depending on the underlying scheme.) 5.
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).
www.ietf.org /rfc/rfc2898.txt   (4798 words)

  
 List of cryptography topics   (Site not responding. Last check: 2007-10-21)
There is a categorised and (somewhat) annotated list of the same articles in subject groupings at Topics in cryptography; it will probably be more useful to those attempting to make some sense of the field.
Topics in cryptography — an analytical list of articles and terms.
Ian Goldberg -- IBM 4758 -- ICE (cipher) -- ID-based cryptography -- Identification friend or foe -- IEEE 802.11i -- IEEE P1363 -- I.
www.worldhistory.com /wiki/L/List-of-cryptography-topics.htm   (648 words)

  
 DTC past seminars/symposia: Gene Tsudik   (Site not responding. Last check: 2007-10-21)
Identity-based public key encryption facilitates easy introduction of public key cryptography by allowing an entity's public key to be derived from an arbitrary identification value, such as name or email address.
The main practical benefit of identity-based cryptography is in greatly reducing the need for, and reliance on, public key certificates.
Furthermore, it is fundamentally difficult to reconcile fine-grained revocation with identity-based cryptography.
www.dtc.umn.edu /seminars/021903.html   (402 words)

  
 ID-based Cryptography Encyclopedia Article, Definition, History, Biography   (Site not responding. Last check: 2007-10-21)
Looking For id based cryptography - Find id based cryptography and more at Lycos Search.
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Look for id based cryptography - Find id based cryptography at one of the best sites the Internet has to offer!
www.karr.net /search/encyclopedia/ID-based_cryptography   (824 words)

  
 The World-Wide Web Virtual Library: Random Numbers and Monte Carlo methods
Cryptography: The Study of Encryption, by Francis Litterio.
A report on the performance of this generator in a series of stringent empirical tests is already available as a.ps or.gzipped document.
Cryptography: The Passphrase FAQ, an attempt at a passphrase FAQ for PGP.
random.mat.sbg.ac.at /links/crypto.html   (278 words)

  
 Computer Science at Kent
Cryptographic workflow is a term coined by Paterson for the use of ID-based cryptography in a system where the recipient encrypts to keys whose private component may not yet exist.
The idea is that the recipient has to engage in a "workflow" to obtain the keys by performing some acts, or showing posession of data, for the relevant authorization authorities.
In addition, our scheme is "escrow-free", by which we mean that the authorization authorities can determine no information about the actual message being encrypted, a property not holding for prior work in this area.
www.cs.kent.ac.uk /dept_info/seminars/2004_05/abs_2005_02_01.html   (310 words)

  
 ID-Based One Round Authenticated Tripartite Key Agreement Protocol with Pairings - Zhang, Liu, Kim (ResearchIndex)   (Site not responding. Last check: 2007-10-21)
Abstract: With various applications of Weil pairing (Tate pairing) to cryptography, ID-based encryption schemes, digital signature schemes, blind signature scheme, two-party authenticated key agreement schemes, and tripartite key agreement scheme were proposed recently, all of them using bilinear pairing (Weil or Tate pairing).
60 Cryptosystems based on pairing (context) - Sakai, Ohgishi et al.
46 An identity based encryption scheme based on quadratic resid..
citeseer.lcs.mit.edu /zhang02idbased.html   (717 words)

  
 ID-Based Blind Signature and Ring Signature from Pairings (SMEALSearch) - Pal,Rangaswamy,Giles,Debnath   (Site not responding. Last check: 2007-10-21)
Recently the bilinear pairing such as Weil pairing or Tate pairing on elliptic curves and hyperelliptic curves have been found various applications in cryptography.
Several identity-based (simply ID-based) cryptosystems using bilinear pairings of elliptic curves or hyperelliptic curves were presented.
In this paper, we firstly propose an ID-based blind signature scheme and an ID-based ring signature scheme, both of which are based on the bilinear pairings.
smealsearch.psu.edu /50069.html   (271 words)

  
 SDSU Computational Science Research Center - Events & Seminars - Colloquium - Archive List Details   (Site not responding. Last check: 2007-10-21)
In this talk I will present basic fundamentals of cryptography from the perspective of nonlinear dynamics theory and chaos theory.
Chaos-based cryptography will be discussed from a point of view which I believe is closer to the spirit of both cryptography and chaos theory than the way the subject has been treated recently by many researchers.
In particular, I will present my research results on the relation between chaos and cryptography, design of block encryption algorithms and pseudo-random number generators, and public-key encryption algorithms.
www.csrc.sdsu.edu /csrc/events/colloquium/archives/archive_info.php?ID=3   (205 words)

  
 Breakthrough in Quantum Cryptography -- Swiss Partnership To Release World's First Integrated Quantum Key Infrastructure
WISeKey, ID Quantique and OISTE Sign a Partnership Agreement to Develop a Quantum Key Infrastructure Based on the OISTE ROOT and Quantum Cryptography GENEVA, Oct. 13 /PRNewswire/ -- Three leading E-Security organizations in Geneva are joining forces to deploy what will be the first ever integrated Quantum Key Infrastructure.
"Quantum cryptography exploits a fundamental principle of quantum physics -- observation causes perturbation -- to distribute cryptographic keys with absolute security.
id Quantique is introducing the first quantum cryptography system, which exchanges keys over standard optical fibers.
www.prnewswire.com /cgi-bin/stories.pl?ACCT=104&STORY=/www/story/10-13-2003/0002034212&EDATE=   (491 words)

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