No "ciphering" panel in "Performance" page

[BraveKenny]

On my 1.6.1.2 Prestashop site's "Performance" page, there is no "Ciphering" panel :

 

 

Although I do have mcrypt installed :

root@test:/home/test# php -i | grep mcrypt
/etc/php5/cli/conf.d/20-mcrypt.ini,
Registered Stream Filters => zlib.*, bzip2.*, convert.iconv.*, string.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk, mcrypt.*, mdecrypt.*
mcrypt
mcrypt support => enabled
mcrypt_filter support => enabled
mcrypt.algorithms_dir => no value => no value
mcrypt.modes_dir => no value => no value

How do I make it appear?

[BraveKenny]

OK, so I noticed that the RIJNDAEL settings were not defined in config/settings.inc.php and that's what was hiding my panel.

 

So I added some that I found online and the panel appears now. Do you know how to update these two keys though? I don't really want to use used rijndael keys...

Edited November 1, 2015 by BraveKenny (see edit history)