An often secret or hidden method of bypassing security mechanisms is known as a:

An often secret or hidden method of bypassing security mechanisms is known as a:

• Backdoor
• Trick door
• Secret passage
• Pass through 

EXPLANATION

A backdoor is a method, often secret, of bypassing normal authentication or encryption in a computer system, a product, or an embedded device, or its embodiment, e.g. as part of a cryptosystem, an algorithm, a chipset, or a "homunculus computer". Backdoors are often used for securing remote access to a computer, or obtaining access to plaintext in cryptographic systems.