haveged A daemon that replenishes the /dev/random pool
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number random generator entropy collection random numbers generator cryptography randomness

haveged Description

A daemon that replenishes the /dev/random pool haveged is a daemon that replenishes the /dev/random pool on Linux using an adaptation of the HArdware Volatile Entropy Gathering and Expansion algorithm invented at IRISA. The algorithm tunes itself on machines that have cpuid support, and it tested to work on bots 32 and 64-bit processors.In practice, the collection sequence consists of a branch-heavy calculation that reads the processor time stamp readings into an data array as it permutes the array contents. The data array is sized to be twice that of the level 1 data cache and the calculation constructed so that 2 cache blocks are party to each output calculation. The calculation would be cyclical if not for the effects of other unrelated hardware events on the time stamp counter increments. What's New in This Release: · The package is now known to build and run under gcc 4.4 in 64-bit mode. · This required a major cleanup of the test suites, and a rework of the strategy to deal with compiler optimization. · The auto-tune feature was updated according to the Intel cpuid application note of August 2009. · A man(8) page was added.

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