The Linux-Generated Random Numbers Are Predictable

Two security engineers have figured out that Linux generates “predictable” random numbers, which are later used to encrypt data. The random numbers are produced from different sources, like the mouse movements of the user, keyboard input or hardware generated strings, data which is fed to the kernel.

As you may know, Linux systems have two ways to trigger random numbers, by using either /dev/random or /dev/urandom.

The two tools have different ways to generate numbers, the first providing data that is almost 100% entropy, while the second uses its PRNG (Pseudo-Random Numbers Generator).

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