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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.
To rekey such a lock, the locksmith simply replaced all the wafers with identical "crushable wafers", cut the new key, inserted the key into the plug, inserted the plug into a special "crushing" tool, and squeezed the handle of the tool, crushing the wafers to fit the key.
Therefore, key protection is paramount. So long as use of encryption remains reasonably limited, key security is realistically manageable. However, in the mid-twentieth century, military and diplomatic telecommunications loads grew by orders of magnitude. Encryption systems became automated and key quantities ballooned.
Although replacing lost keys for automobiles and homes, as well as rekeying locks for security purposes, remains an important part of locksmithing, a 1976 US Government publication noted that modern locksmiths are primarily involved in installing high-quality lock-sets and managing keying and key control systems.
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 ...
The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.