I did NOT want to bother you guys with this question but I sent a PM to someone competent here since 10 hours and till now.. no answer.
Basically, I wish to prevent my strings being readable(hard to decrypt etc) if someone tries to decompile my plugin. Plugin will be for a small cs community and can be seen as a 'web auth system'. I did not want to rely on steamID only and added the steamID <---> webusername as a bonus

..
e.g
username : nickname : steamID : ip
The plugin cannot be released to the community there! how can I make my strings encrypted.
Rot13, xtea are not what I find better. Both can be reversed easily

!
I'm ready to send my plugin to moderators here...
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