Operating systems

The Linux Pseudorandom Number Generator Revisited

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Executive Summary

The Linux PseudoRandom Number Generator (PRNG) is a PRNG with entropy inputs which is widely used in many security related applications and protocols. This PRNG is written as an open source code which is subject to regular changes. It was last analyzed in the work of Gutterman et al. in 2006 [GPR06] but since then no new analysis has been made available, while in the meantime several changes have been applied to the code, among others, to counter the attacks presented in [GPR06]. The authors' paper describes the Linux PRNG of kernel versions 2.6.30.7 and upwards. They detail the PRNG architecture in the Linux system and provide its first accurate mathematical description and a precise analysis of the building blocks, including entropy estimation and extraction.

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