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High security locks are locks that provide increased resistance to compromise. While many vendors market their locks as high security, only those that are given the UL437 security rating (or have withstood a long period of analysis by manufacturers, locksmiths, security researchers, and lock-sport enthusiasts) are considered high security.

The main goal of high security locks is not to be undefeatable, but instead make defeat too expensive or time consuming to be feasible
Most high-security locks have many of the following in their design:  
Restrictive Key-ways
The use of complex key-ways frustrate attacks by manipulation by making it harder to insert and maneuver tools within the lock.
Key Control
The ability to control the creation, distribution, and cutting of keys for a given lock can greatly increase the security of the keying system for a given lock. Most high security locks have key bows and warding patterns that are patent protected to prevent unauthorized manufacturing. Keys for high security locks also generally require a security card be presented for a locksmith to duplicate keys. Many also require a specialized key cutting machine.
Manipulation Resistance
Almost all high-security locks have components designed to resist manipulation from lock-picking and decoding attacks. Security pins are the most popular example of anti-manipulation components in pin-tumbler locks. Some locks also have components designed to resist impression and key bumping.
Destructive/Forced Entry Resistance
All high-security locks use strong materials and designs that make them resistance to destructive entry techniques. Steel rods, ball bearings, and hardened materials are common.
Abloy High Security