| The first step in bumping a lock is creating a bump key for that lock. To create a bump key you need a key which has the correct profile to fit into the lock i.e it needs to be able to fit into the lock. The more popular and widely available your lock - the greater the chance a bump key can be easily created. If your lock has a restricted key profile or a very uncommon profile it will harder to create a bump key. This will offer some protection against having your lock bumped but it may still be possible to manufacture a key with the correct profile. So a restricted key profile alone may make a lock harder to bump but does not make a lock bump proof.|
Many rim locks are vulnerable to bumping because they use pin tumblers. Some however use a different mechanism, like the . This lock uses discs instead of pins and so cannot be bumped.
Some locks that utilise pin tumblers also contain additional security elements such as a sidebar. These elements may significantly reduce the risk of bumping, as although the pin tumblers can be bumped the sidebar would frustrate or prevent a bumping attack.