A Literal Security Hole! (Jin Hao Combination Bike Lock)

When it comes to designing locks, some designers make decisions that leave you wondering if they are familiar with non-destructive entry techniques. This becomes evident when examining the Jin Hao combination bike lock. With a glaring design flaw, this lock’s security is easily compromised.

The Jin Hao bike lock initially appears to be a standard combination lock. However, upon closer inspection, you can easily bypass its security using a technique similar to other combination locks. This is accomplished with a covert instruments Notch decoder or even a simple screwdriver.

To demonstrate the weakness in this lock’s design, let’s first change the combination. After removing a small cover, the change switch is exposed. Note that this switch only works when the correct combination is dialed. Change the combination and then scramble the wheels, ensuring you have a lock with an unknown combination.

Now, the design flaw becomes apparent. The hole left by the removed cover exposes the bar that would typically be manipulated with the Notch decoder. This means you can open the lock using anything that fits through the hole, such as the same screwdriver used to remove the cover.

Insert the screwdriver into the hole and press down on the bar while turning each wheel until you find a loose spot in its travel. You can quickly determine the combination and unlock the lock.

Anyone familiar with lock design principles would have known to protect that bar. Instead, Jin Hao’s designers left a literal security hole, compromising the lock’s integrity.

If you have any questions or comments about this lock, feel free to leave them below. For more lock-related content, subscribe to our channel. As always, have a nice day and stay secure.