Rekeying

Rekeying is changing a lock thus allowing a different key to operate it. Rekeying is done when a lock owner may be concerned that unauthorized people have keys to the lock. The lock may be altered by a locksmith thus only new keys will work. Rekeying is the relatively simple process of changing the tumbler or wafer configuration of the lock thus a new key will function while the old one will not. Rekeying is done without replacement of the entire lock.

Rekeying was first invented in 1836 by Solomon Andrews, a New Jersey locksmith. His lock had adjustable tumblers and keys, allowing the owner to rekey it at any time. Later in the 1850s, inventors Andrews and Newell patented removable tumblers which could be taken apart and scrambled. The keys had bits that were interchangeable, matching varying tumbler configurations. This arrangement later became the basis for combination locks.^[1]

In cryptography

In cryptography, rekeying refers to the process of changing the session key -- the encryption key of an ongoing communication -- in order to limit the amount of data encrypted with the same key.

Roughly equivalent to the classical procedure of changing codes on a daily basis, the key is changed after a pre-set volume of data has been transmitted or a given period of time has passed.

In contemporary systems, rekeying is implemented by forcing a new key exchange, typically through a separate protocol like Internet key exchange (IKE). The procedure is handled transparently to the user.

A prominent application is Wi-Fi Protected Access (WPA), the extended security protocol for wireless networks that addresses the shortcomings of its predecessor, WEP, by frequently replacing session keys through the Temporal Key Integrity Protocol (TKIP), thus defeating some well-known key recovery attacks.

References

↑ Phillips, Bill (2005). The Complete Book of Locks and Locksmithing. Chicago: McGraw-Hill Professional. p. 9. ISBN 0-07-144829-2.

External links

OpenSSH: KeyRegenerationInterval parameter, ~R command

Locksmithing & Lock picking

Topics	Electric strike Key control Key relevance Lock bumping Lock picking Lockout-tagout Maison key system Rekeying Single-point locking Three-point locking

Components	Bitting Bolt stump Break Interchangeable core Key blank Key code Keyhole Lockset Shear line Split pin

Key types	Berlin key Bump key Change key Master key Skeleton key Smart key Tubular key Transponder key

Mechanical Locks	Bored cylindrical lock Bramah lock Cylinder lock Disc tumbler lock Key retainer Lever tumbler lock (Chubb detector lock) Magnetic-coded lock Magnetic keyed lock Mortise lock Padlock Combination lock Rotary combination lock Time-delay combination locks Pin tumbler lock (snib) Protector lock Relocking device Time lock Tubular pin tumbler lock Warded lock Wafer tumbler lock

Electronic Locks	Electromagnetic lock Electronic lock Electric strike Magnetic-coded lock Keycard lock Electronic/digital-cylinder pin tumbler lock

Specific lock types	Bicycle lock Chamber lock Child safety lock Dead bolt Keycard lock Kensington Security Slot Luggage lock Power door locks The Club TSA lock

Tools	Lockpick Slim Jim Snap gun Tubular lock pick

Related	Bolt cutter Door chain Exit control lock Famous locksmiths Interlock (engineering) Keychain Key (engineering) Lock manufacturers Lock puzzle Lock snapping Locksport Two-man rule

Category:Locksmithing Keys Locks Book

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Rekeying

In cryptography

See also

References

External links