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27 lines
1.3 KiB
Text
27 lines
1.3 KiB
Text
haveged (a simple entropy-gathering daemon)
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The haveged project is an attempt to provide an easy-to-use, unpredictable
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random number generator based upon an adaptation of the HAVEGE algorithm.
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Haveged was created to remedy low-entropy conditions in the Linux random
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device that can occur under some workloads, especially on headless servers.
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The HAVEGE algorithm is based upon the indirect effects of unrelated hardware
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events on the instruction timing of a calculation that is sensitive to
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processor features such as branch predictors and instruction/data access
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mechanisms.
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Samples from a high-resolution timer are input into the algorithm to
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produce a stream of random data in a collection buffer. The contents of this
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buffer can be fed into the random device or accessed directly through the
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file system. File system access is a useful alternative to those situations
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where use of the random device is either inappropriate or not available.
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Add the following snippet to your /etc/rc.d/rc.M to start up haveged at boot:
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# Starting HAVEGED entropy daemon
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if [ -x /etc/rc.d/rc.haveged ]; then
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/etc/rc.d/rc.haveged start
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fi
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You can see how many bits of entropy are available to the system by reading
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the /proc/sys/kernel/random/entropy_avail file, and check the size of your
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entropy pool at /proc/sys/kernel/random/poolsize.
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