Manual:$wgSecretKey/yo

Details
This should always be customized to a secret, unique string in. sets it to a 64-character random string generated by

Nigbati ko ba si awọn orisun entropy to dara julọ fun MediaWiki, iye yii ni a lo bi orisun ti entropy cryptographic nigbati o ba n ṣe ipilẹṣẹ (s) lati fi sii sinu tabili olumulo $ eyiti o jẹ kuki ti o tẹsiwaju fun ijẹrisi (nigbati olumulo kan ba ṣayẹwo “Ranti buwolu wọle mi lori ẹrọ aṣawakiri yii) ti o ni agbara si sisọ. On modern PHP versions with access to /dev/urandom, mcrypt random, or openssl random, these functions are used in lieu of this variable for the purpose of token generation. However this variable is still used for other purposes, so it is still very important it be set to a unique random value even on modern PHP.

$wgProxyKey
From 1.3 to 1.4, $wgProxyKey was the documented setting for this. In 1.4, this was marked as deprecated in favor of $wgSecretKey. In 1.24, $wgProxyKey was removed (yes, it really did take almost 10 years to remove).