broke my OpenSSH how?

[Rickie Kerndt <kerndtr@kerndt.com>]

running OpenBSD2.7-released (patched manually, easily done thankyou), 
ssl-2.7-intl ssl libs, OpenSSH 2.2.0.

Somehow i ran into a permissions problem with /dev/arandom which caused all 
the ssh stuff to break getting errors of no RSA support even though i have 
the correct libs. sshd continued to do rsa authentication which led me to 
look into a possible permissions problem after first replacing the libs 
with fresh copies and upgrading from OpenSSH 2.1.1 to OpenSSH 2.2.2.

What i can't understand and hence my question is that ssh was working fine 
up to Oct 27 when a user sent me an email saying scp was broke. Making 
/dev/arandom group and other readable fixed it. So why work and then not 
work? Was one of the other random devices being used previously and then 
arandom selected? I swear i never changed permissions of the device files!

stubing:dev {161} ll ?random
0 crw-------  1 root  wheel  119,   4 Oct 31 18:43 arandom
0 crw-r--r--  1 root  wheel  119,   3 Jul 14 20:06 prandom
0 crw-r--r--  1 root  wheel  119,   1 Jul 14 20:06 srandom
0 crw-r--r--  1 root  wheel  119,   2 Oct 31 18:43 urandom