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Topic: Rekeying

	Authentication of rekey messages in a communication system - Patent 5185795
		Manual rekeying is accomplished by connecting a cable from a hand-held keyloading device (also called a key variable loader, or keyloader for short) to the secure unit and downloading the keys from the keyloader into the communication unit by pressing the appropriate buttons on the keyloader.
		Rekeying is also performed on a group basis, when a plurality of units are rekeyed with the same keys at substantially the same time due to group affiliation.
		A rekey request is sent when a unit's operator is aware of the need to rekey and rekeying has not taken place, for example because the unit was not powered-up during rekeying or was out of RF range of the system.
	www.freepatentsonline.com /5185795.html (9781 words)

	index
		If rekeying occurs after each join or leave, it is hard to control the synchronization that will arise because of inter-dependencies among rekey messages as well as between rekey and data messages.
		New users may have to wait for a batch rekey to get their key, and old users may be able to stay in the group longer than they should be.
		Rekeying after each join or leave would be extremely costly, and rekeying too infrequently is bad for usability.
	zoo.cs.yale.edu /classes/cs490/01-02b/mcdonald.kean.kbm6 (2217 words)

	Proceedings of the 8th USENIX Security Symposium, August 23-36, 1999, Washington, D.C.
		A join-sensitive rekeying policy, by itself, does not ensure that members who left the group or were ejected from the group are not able to access current session content.
		In practice, a join-sensitive rekeying policy is likely to be used in conjunction with a time-sensitive or a leave-sensitive rekeying policy to limit the duration over which past members can access current session content.
		In a key hierarchy, rekeying is performed by the distribution a number of keys which is roughly proportional to the log of the group size.
	www.usenix.org /events/sec99/full_papers/mcdaniel/mcdaniel_html (9732 words)

	clancy-eap-rekeying-00.txt
		Overview The fast rekeying protocol, which utilizes the EAP Identity message to notify the EAP server of a request for fast handoff, minimizes the number of messages between the authenticator and the AAA server and requires no changes to the existing EAP or AAA protocols.
		Expires August 8, 2004 [Page 6] Internet-Draft Fast EAP Rekeying February 2004 recognize additional data exists beyond the null character by noticing the field length is not equal to the string length.
		Expires August 8, 2004 [Page 7] Internet-Draft Fast EAP Rekeying February 2004 The worst an attacker could do is force a client to perform a full authentication during each reassociation, however significantly more detrimental denial of service attacks exist for most link-layer protocols.
	ietfreport.isoc.org /idref/draft-clancy-eap-rekeying (2454 words)

	RFC 4344 (rfc4344) - The Secure Shell (SSH) Transport Layer Encryption Mod
		Rekeying Section 9 of [RFC4253] suggests that SSH implementations rekey after every gigabyte of transmitted data.
		Second Rekeying Recommendation Because of a birthday property of block ciphers and some modes of operation, implementations must be careful not to encrypt too many blocks with the same encryption key.
		Rekeying Considerations Section 3 of this document makes two rekeying recommendations: (1) rekey at least once every 232 packets, and (2) rekey after a certain number of encrypted blocks (e.g., 2(L/4) blocks if the block cipher's block length L is at least 128 bits).
	www.faqs.org /rfcs/rfc4344.html (2858 words)

	DriveWerks.com - Technical Articles - Rekeying Locks
		Forward: This article centers upon rekeying locks for Porsches, however, the principles are nearly the same for all cars.
		Whether you have a 356, 911, 914 or other Porsche, the principle of rekeying the locks are the same.
		Figure 7 shows a typical lock rekeying key complete with a bunch of tumbler pins and replacement springs.
	www.drivewerks.com /tech/mult_lock_rekey.htm (1168 words)

	ietf-secsh-newmodes-05.txt
		Rekeying Section 9 of [SSH-TRANS] suggests that SSH implementations rekey after every gigabyte of transmitted data.
		3.2 Second Rekeying Recommendation Because of a birthday property of block ciphers and some modes of operation, implementations must be careful not to encrypt too many blocks with the same encryption key.
		6.1 Rekeying Considerations Section 3 of this document makes two rekeying recommendations: (1) rekey at least once every 232 packets and (2) rekey after a certain number of encrypted blocks (e.g., 2(L/4) blocks if the block cipher's block length L is at least 128 bits).
	ietfreport.isoc.org /idref/draft-ietf-secsh-newmodes (3140 words)

	Press Releases (2000 - 2005) (Site not responding. Last check: 2007-10-22)
		Manual rekeying involves the exchange of key management messages between a KFD and an MR for the purposes of provisioning an MR with encryption keys or other key management-related information, erasing keys in an MR or viewing key management-related information in an MR.
		When used with OTAR rekeying procedure, manual rekeying can be used to provision an MR with key management parameters required for OTAR operation in addition to provisioning encryption keys.
		Within the manual rekeying standard option, some minimum set of features/procedures are required and are considered mandatory, while other features/procedures are not absolutely needed and are considered optional.
	www.tiaonline.org /media/press_releases/index.cfm?print=&parelease=05-66 (454 words)

	VPNC Rekeying Conformance Test
		The Rekeying Conformance test is to see whether or not the tested gateway can automatically rekey the Phase 2 SA when it is needed.
		The purpose of rekeying is to prevent a snooper from having too much data that has been encrypted with a particular key.
		Automatic rekeying and PFS are generally considered advanced features that are only needed by IPsec users with aggressive and sophisticated attackers, but employing them adds very little overhead to typical IPsec use.
	www.vpnc.org /detail-rekeying-conformance.html (354 words)

	Schlage — Rekeying
		Any Schlage lock can be rekeyed to match other Schlage locks in your customer's home.
		Load new top pins (pointed end down) into cylinder plug with pins from the rekeying kit corresponding to new combination.
		To rekey the inside cylinder of B362 Maximum Security deadbolts, simply repeat steps 2 through 7.
	consumer.schlage.com /tradeprof/rekeying.asp (473 words)

	Batch Rekeying for Secure Group Communications1
		Batch rekeying improves efficiency because it reduces the number of rekey messages to be signed: one for a batch of requests, instead of one for each.
		Batch rekeying also takes advantage of the possible overlap of new keys for multiple rekey requests, and thus reduces the possibility of generating new keys that will not be used.
		In individual rekeying, all the keys on the path from the request location to the root of the key tree have to be changed.
	www10.org /cdrom/papers/521/index.html (4546 words)

	NACE Live Action Theater Tackles Rekeying Issue
		Rekeying becomes an issue when a shop receives a paper or faxed estimate that requires being entered into the shop’s estimating system – otherwise known as rekeying.
		The need to rekey into other estimating systems is often required and takes even longer.
		Rekeying into the same brand of estimating system can be eliminated through the use of the information provider’s proprietary communication network.
	www.collision-insight.com /news/20051018-nace.htm (444 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		Some important parameters when performing multicast rekeying are: number of keys to store by the KS, number of keys to deliver in the Pegueroles, Hernßndez-Serrano, Rico-Novella, Soriano [Page 2] Internet Draft draft-irtf-msec-gdoi-batch-lkh-00.txt June, 2003 initialization stage, bandwidth required for updating the keys and latency for updating the session key [3].
		When rekeying is needed, the KS does not send the updated key themselves but the required information that single users need in order to update them.
		In every rekeying, the entire tree is updated and all random numbers are recomputed, so two different messages for different rekeyings will have different factors in the message and gcd() algorithm cannot be used.
	www.faqs.org /ftp/pub/internet-drafts/draft-irtf-gsec-gdoi-batch-lkh-00.txt (4124 words)

	Adaptive Rekeying for Secure Multicast (Site not responding. Last check: 2007-10-22)
		Due to the dynamic nature of these groups, to preserve secrecy, it is necessary to change the group key whenever the group membership changes.
		This interruption is especially necessary if the rekeying is done because a user has left (or is removed).
		We split the rekeying cost into two parts: the cost of the critical path ---where each user receives the new group key, and the cost of the non-critical path ---where each user receives any other keys that it needs to obtain.
	www.cse.msu.edu /~sandeep/publications/kb03 (236 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		When rapid rekeying is enabled, an access point ignores its manually-set keys.
		It generates pseudo-random keys on a periodic basis, using IEEE 802.1x key distribution to deliver the keys to new and current clients.
		When rapid rekeying (periodic changing of radio keys) is enabled, the value of this object determines the period, in seconds, between key changes.
	www.enterasys.com /pub/snmp/mibs/enterasys/enterasys-encr-8021x-rekeying-mib.txt (1679 words)

	Rekeying Redux
		Cindy Schnier, co-chair of the committee, said the study found that on average, shops have to rekey data from printed insurer estimates into their own estimating systems for about 28 percent of their jobs.
		The shops who responded to the survey said this rekeying process takes an average of about 21 minutes if the estimate was written on an estimating system the shop has, and about 33 minutes if it was written in a different estimating system.
		"But some insurers desk-audit estimates, and they have to rekey them, so it would be advantageous to those insurers to be able to use the data this same way," he said.
	www.collision-insight.com /news/archives/200407-feature.htm (1273 words)

	Key control is the most important aspect of your security
		Rekeying your locks does not solve your problem, it only restarts the cycle...
		Before rekeying contact us to learn about other options.
		Without proper key control, you are faced with the threat of expensive rekeying every time your keys leave your sight.
	www.keymasters.biz /rekey.htm (430 words)

	tow.com » blog » Rekeying Locks
		I spent yesterday afternoon and late evening rekeying several of the locks in the new house, and boy was it an interesting experience.
		While browsing the aisles at OSH, I noticed a rekeying kit amongst the rows of Schlage and Kwikset locks.
		The actual process of rekeying is simple, so as long as you don’t pop the internal pins and springs!
	www.tow.com /2006/03/12/rekeying-locks (655 words)

	Technique for Method-Specific Fast EAP Rekeying
		A technique for fast rekeying with EAP is described here.
		This document describes an EAP [I-D.ietf-eap-rfc2284bis] method-specific rekeying technique that is both fast and secure.
		The fast rekeying protocol, which utilizes the EAP Identity message to notify the EAP server of a request for fast handoff, minimizes the number of messages between the authenticator and the AAA server and requires no changes to the existing EAP or AAA protocols.
	www.cs.umd.edu /~clancy/docs/draft-clancy-eap-rekeying-00.html (2034 words)

	The 3 key main ideas are that the emergence of data computer networks has provided many examples to illuminate the ...
		This paper discusses the scalability issues of reliable group rekeying, and provide a performance analysis of a group key management system (called keygem) based upon the use of key trees.
		The main contribution of the paper is its detailed performance analysis of the batch rekeying algorithms versus individual rekeying ones, the three key assignment algorithms of Breadth First Assignment (BFA), Depth First Assignment (DFA), and Recursive BFA(RFA), and receiver protocol with sparseness property in terms of conventional reliable multi-cast.
		As acknowledged by the authors, there is still work to be done to consider dynamic partitioning of group users, and more detailed trace based experimental evaluations.
	zoo.cs.yale.edu /classes/cs633/Reviews/YZLL01.sl354.html (258 words)

	SSH Frequently Asked Questions (Site not responding. Last check: 2007-10-22)
		This is a feature of the SSH-2 protocol which allows either side to force another run of the key-exchange phase, changing the encryption and integrity keys for the session.
		The problem is that no other SSH-2 implementation currently does session rekeying, and they die in various ways when they receive the rekeying message from SSH2.
		Since rekeying is not optional (the receiving side can't refuse to do it), the only sure way to avoid this is to turn off rekeying in SSH2: set RekeyIntervalSeconds to 0 (in
	www.snailbook.com /faq/no-rekeying.auto.html (187 words)

	ACM SIGCOMM 2001
		In this paper, we investigate scalability issues of reliable group rekeying, and provide a performance analysis of our group key management system (called keygem) based upon the use of key trees.
		Instead of rekeying after each join or leave, we use periodic batch rekeying to improve scalability and alleviate out-of-sync problems between rekey messages as well as between rekey and data messages.
		We observe that rekey transport has an eventual reliability and a soft real-time requirement, and that the rekey workload has a sparseness property, that is, each group user only needs to receive a small fraction of the packets that carry a rekey message sent by the key server.
	www.sigcomm.org /sigcomm2001/p3.html (235 words)

	Pelican Technical Article: Rekeying Porsche Locks
		Either way, having more than one key for the car can be a pain, especially if different doors use different keys.
		This Pelican Technical Article shows you the easy way to rekey your locks.
		The first step is to remove the lock from the car.
	www.pelicanparts.com /techarticles/mult_lock_rekey/mult_lock_rekey.htm (1129 words)

	GKMPAN: An Efficient Group Rekeying Scheme for Secure Multicast in Ad-Hoc Networks - Zhu, Setia, Xu, Jajodia ...
		If your firewall is blocking outgoing connections to port 3125, you can use these links to download local copies.
		Our protocol exploits the property of ad hoc networks that each member of a group is both a host and a router, and distributes the group key to member nodes via a secure hop-byhop propagation scheme.
		A probabilistic scheme based on pre-deployed symmetric keys is used for implementing secure channels between members for group key distribution.
	citeseer.ist.psu.edu /zhu04gkmpan.html (555 words)

	VideoHelp.com Forum Archive - Cutting avi - rekeying not specified
		And it is extremely slow till the point where all freezes and I must terminate the programme.
		Well, I would try firstly to analyse the file in Gspot and if it is not divx, will uninstall divx6 and install the last Koepi xvid build.
		Next I would try to rekey the file as suggested by VDub (I don't know now how to do it, but I would try to do it).
	www.videohelp.com /forum/archive/t274110.html (230 words)

	BMWSportTouring Forums: ReKeying new R1200st and rt saddlebags
		I was wondering if someone has figured out how to remove the lock cylinder and rekey the saddlebags from one of the new R1200 either ST or RT bikes?
		Re: ReKeying new R1200st and rt saddlebags [Re: hmeiseles]
		Generated in 0.019 seconds in which 0.006 seconds were spent on a total of 12 queries.
	bmwsporttouring.com /ubbthreads/showflat.php?Number=703442 (224 words)

	Airheads Beemer Club - Rekeying a Seatlock (Site not responding. Last check: 2007-10-22)
		This procedure is broken down into 4 basic parts: getting the lock out of the bike, getting the pins out of the old lock, putting them in the new lock, and putting the lock back in the bike.
		While the specifics of installation, removal and pin-access may not apply to other locks on the bike (or in general), the rekeying steps can easily be applied to other locks.
		Without any instruction, it took me about 30 minutes to do the actual rekeying, having spent 15 minutes beforehand, removing the lock.
	www.airheads.org /content/view/192/49 (1607 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		The first strategy to deal with the rekeying problem is called "Baseline Rekeying".
		When a node moves into a new area, the new area must rekey, but it will only have to once for each new node.
		note that immediate rekeying outperforms delayed rekeying because delayed rekeying may cause several areas to all have to rekey if a member that was once in each of them departs the group completely.
	www.cs.rit.edu /~jad0883/article6.html (533 words)

	VPNC Testing for Conformance
		Full details of the Basic Conformance test include the technical specification of the steps needed to pass, as well as the debugging logs of the tests themselves.
		The Rekeying Conformance test consists of setting up the same type of IPsec tunnel as is required for the Basic Conformance test, and then automatically rekeying the Phase 2 SA when it is needed.
		Full details of the Rekeying Conformance test include the technical specification of the steps needed to pass, as well as the debugging logs of the tests themselves.
	www.vpnc.org /conformance-logos.html (762 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		If true(1), the authenticator and supplicant will use different encryption keys in order to transmit data.
		If false(2), the authenticator and supplicant will use a single key pattern to encrypt the transmitted data." DEFVAL { true } ::= { etsysDot1xRekeyConfigEntry 4 } etsysDot1xRekeyPairwise OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-write STATUS current DESCRIPTION "Determines whether Rapid Rekeying tumbles Pairwise keys (when it is enabled, and the radio card supports them).
		If true(1), it indicates that the access point should tumble both Pairwise and Group keys.
	www.enterasys.com /pub/snmp/mibs/enterasys/enterasys-8021x-rekeying-mib.txt (475 words)

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