Backdoor (computing) facts for kids

A backdoor in computers is like a secret, hidden way to get into a system or program without using the normal security steps. Imagine a locked door with a secret key that only a few people know about – that's kind of what a backdoor is. It lets someone bypass passwords, firewalls, or other security measures.

Sometimes, backdoors are put there on purpose by the people who made the software or hardware, maybe for maintenance or to fix problems. But often, they are put there by hackers or malicious groups to gain unauthorized access. This can be dangerous because it allows them to control your computer, steal information, or cause damage without you knowing.

A simple example of a backdoor could be a default password that's built into a device or program. If you don't change this password, anyone who knows it can get in. Special programs can also act as backdoors, running secretly on a computer to allow remote access.

Known Backdoors in Computer Standards

Sometimes, even important computer standards or widely used programs have had hidden backdoors. These are often found by security experts who study the code very carefully.

• Some older ways of creating digital "fingerprints" for data, called hash algorithms, were found to have weaknesses that could act like backdoors. These include algorithms like MD2, MD4, and MD5.
• A method for creating random numbers, called Dual EC DRBG, was found to have a secret backdoor. This backdoor was reportedly put there on purpose by a government agency, allowing them to potentially spy on encrypted communications.

Images for kids

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  Marked in yellow: backdoor admin password hidden in the code

See also

In Spanish: Puerta trasera para niños