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-This document contains a description of portable OpenSSH's random
-number collection code. An alternate reading of this text could
-well be titled "Why I should pressure my system vendor to supply
-/dev/random in their OS".
-
-Why is this important? OpenSSH depends on good, unpredictable numbers
-for generating keys, performing digital signatures and forming
-cryptographic challenges. If the random numbers that it uses are
-predictable, then the strength of the whole system is compromised.
-
-A particularly pernicious problem arises with DSA keys (used by the
-ssh2 protocol). Performing a DSA signature (which is required for
-authentication), entails the use of a 160 bit random number.  If an
-attacker can predict this number, then they can deduce your *private*
-key and impersonate you or your hosts.
-
-If you are using the builtin random number support (configure will
-tell you if this is the case), then read this document in its entirety.
-Alternately, you can use Lutz Jaenicke's PRNGd - a small daemon which
-collects random numbers and makes them available by a socket.
-
-Please also request that your OS vendor provides a kernel-based random
-number collector (/dev/random) in future versions of your operating
-systems by default.
-
-On to the description...
-
-The portable OpenSSH contains random number collection support for
-systems which lack a kernel entropy pool (/dev/random).
-
-This collector (as of 3.1 and beyond) comes as an external application
-that allows the local admin to decide on how to implement entropy
-collection.
-
-The default entropy collector operates by executing the programs listed
-in ($etcdir)/ssh_prng_cmds, reading their output and adding it to the
-PRNG supplied by OpenSSL (which is hash-based). It also stirs in the
-output of several system calls and timings from the execution of the
-programs that it runs.
-
-The ssh_prng_cmds file also specifies a 'rate' for each program. This
-represents the number of bits of randomness per byte of output from
-the specified program.
-
-The random number code will also read and save a seed file to
-~/.ssh/prng_seed. This contents of this file are added to the random
-number generator at startup. The goal here is to maintain as much
-randomness between sessions as possible.
-
-The default entropy collection code has two main problems:
-
-1. It is slow.
-
-Executing each program in the list can take a large amount of time,
-especially on slower machines. Additionally some program can take a
-disproportionate time to execute.
-
-Tuning the random helper can be done by running ./ssh-random-helper in
-very verbose mode ("-vvv") and identifying the commands that are taking
-excessive amounts of time or hanging altogher.  Any problem commands can
-be modified or removed from ssh_prng_cmds.
-
-The default entropy collector will timeout programs which take too long
-to execute, the actual timeout used can be adjusted with the
---with-entropy-timeout configure option. OpenSSH will not try to
-re-execute programs which have not been found, have had a non-zero
-exit status or have timed out more than a couple of times.
-
-2. Estimating the real 'rate' of program outputs is non-trivial
-
-The shear volume of the task is problematic: there are currently
-around 50 commands in the ssh_prng_cmds list, portable OpenSSH
-supports at least 12 different OSs. That is already 600 sets of data
-to be analysed, without taking into account the numerous differences
-between versions of each OS.
-
-On top of this, the different commands can produce varying amounts of
-usable data depending on how busy the machine is, how long it has been
-up and various other factors.
-
-To make matters even more complex, some of the commands are reporting
-largely the same data as other commands (eg. the various "ps" calls).
-
-
-How to avoid the default entropy code?
-
-The best way is to read the OpenSSL documentation and recompile OpenSSL
-to use prngd or egd.  Some platforms (like earily solaris) have 3rd
-party /dev/random devices that can be also used for this task.
-
-If you are forced to use ssh-rand-helper consider still downloading
-prngd/egd and configure OpenSSH using --with-prngd-port=xx or
---with-prngd-socket=xx (refer to INSTALL for more information).
-
-$Id: WARNING.RNG,v 1.8 2005/05/26 01:47:54 djm Exp $