Lock bumping is a technique for opening a lock without the correct key, using a specially-cut bump key. The bump key is inserted into the lock and then struck using a blunt object, such as a shoe. This technique leaves little evidence of the break-in, and rarely damages the lock in any way. Many conventional door locks are vulnerable to bumping, especially in apartment complexes, which often use the same type of lock on each door according to information on Security Snobs' website. Some brands are less vulnerable and are advertised as "unbumpable."
According to Apartment Therapy and Gizmodo's website, KwikSet's SmartKey deadbolt lock uses a side-locking bar, which cannot be bumped, rather than using the traditional pins and tumblers. This lock also includes the ability to tune the lock to a new key. So if the lock is compromised through a lost key or other method, the owner can simply rekey the lock without needing to replace it. Rekeying requires a special adaptor, so criminals can't do it on their own.
Abloy Protec locks are extremely difficult to bump or to get a false key for. They use a disc-tumbler system, which includes no bumpable springs. According to Abloy, keys for these locks are available to the public only through certified locksmiths. The owner of each lock receives a signature card, which must be presented in order to receive a copy of the key to a lock. New locks and keys must be purchased through authorised dealers. At the factory level, keys are kept in a high-security section, reducing the chances of key theft from the manufacturer.
BiLock's pick and bump-proof locks use programmable side bars to give every owner a unique lock code. Conventional lock makers often use sidebars made in large quantities, increasing the chances that a generic bumpkey will work in the lock. According to BiLock, these door locks feature over 11,000,000 possible combinations, making duplicate codes unlikely. According to the company, thus far no one has successfully bumped or picked an unmodified BiLock cylinder.
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