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тАО03-22-2011 12:51 PM
тАО03-22-2011 12:51 PM
Below are the ssh-rand-helper output.
test:/opt/ssh/libexec/ssh-rand-helper -vvv
debug1: loading PRNG seed from file //.ssh/prng_seed
Random seed file not found or invalid, ignoring.
.
.
.
debug1: Seeded RNG with 450 bytes from programs
debug1: writing PRNG seed to file //.ssh/prng_seed.bcdZNc2227
debug1: moving temporary PRNG seed to file //.ssh/prng_seed
6f6d3f1df395ab90fd9330228f4006f1b70071edbb5e7ff725d85c9ebbcf026ad68b223eb66759ebebde6966a651afdd
Please tell me why entropy commands required during ssh connection establishment.
Regards
himacs
Solved! Go to Solution.
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тАО03-22-2011 01:19 PM
тАО03-22-2011 01:19 PM
SolutionEntropy is disorder or randomness. In order to generate a good random key for a secure connection, 'sshd' needs a random seed. Your messages suggest that you are running a very old version of SSH. Those ported to HP-UX have used '/dev/urandom' for some time. Older versions would sample various process tables, network statistics, etc to obtain a random seed.
[ By the way, I can't resist noting that life is but a pool of negative entropy, if only for a short time. ]
Regards!
...JRF...
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тАО03-22-2011 01:25 PM
тАО03-22-2011 01:25 PM
Re: ssh entropy commands
Hi JRF,
Thanks for the response.
My server is B.11.23
ssh -V
OpenSSH_5.2p1+sftpfilecontrol-v1.3-hpn13v5, OpenSSL 0.9.8k 25 Mar 2009
HP-UX Secure Shell-A.05.20.014, HP-UX Secure Shell version
Regards
himacs
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тАО03-22-2011 01:32 PM
тАО03-22-2011 01:32 PM
Re: ssh entropy commands
In newer version ssh_prng_cmds file still used?
As per my understanding to get seeds 'ssh-rand-helper' commands runs the 'ssh_prng_cmds' during ssh establishment.
Regards
himacs
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тАО03-25-2011 04:06 PM
тАО03-25-2011 04:06 PM
Re: ssh entropy commands
And the whole purpose of a sysadmin is to make sure that entropy increases (but not too much :-) and to keep it secure. entropy == info