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Here you can find some general information and pointers about security in general and more specifically Blinkenshell.
The shell server only accepts encrypted logins. For SSH, only protocol v2 is allowed.
Normal non-encrypted FTP is not supported, instead SFTP from the OpenSSH package is used to transfer files to and from the shell server.
Sensitive webpages such as phpMyAdmin and Webmail is only available over HTTPS. The certificate is a class 3 certificate from CAcert. If you do not have CAcert's root certificate installed in your browser, follow these instructions to get it: http://wiki.cacert.org/wiki/BrowserClients
Do not use the same password for your shell account as you use for other services. Especially not services that communicate over non-secure protocols like IRC or webpages.
Also, check out our password policy: PasswordPolicy
Phising and trust
No one at Blinkenshell will ever ask you for your password. Do not ever give away your password, not even to someone saying he/she is an admin.
On IRC, there often is no really good way to protect your nickname, so anyone can use anyone else's nickname. Don't trust someone to be an admin just because of the username. Check things like connecting host and if the user is identified with NickServ.
Email can be sent from addresses other than one's own, so don't trust emails asking you to reply with your password or similar just because the sender address is from a trusted domain.
Use common sense and a certain ammount of paranoia and you will be allright
If you want me to send emails to you encrypted or signed with PGP, that's no problem, just ask.
You can download my OpenPGP public key signature on my personal page: JohanMarcusson. You can not fully trust this however, since you downloaded it over the internet. But I'll make sure that no one else publishes an OpenPGP signature on this website trying to say it's mine.
Pretty Good Privacy (PGP): http://en.wikipedia.org/wiki/Pretty_Good_Privacy
Gnu Privacy Guard (GPG, Gnu PGP-thingy): http://www.dewinter.com/gnupg_howto/english/GPGMiniHowto.html