Now you have IPv6 enabled on your mail server but you don’t know any email address what is actually IPv6 enabled as well? Here are two – what I just tested: email@example.com firstname.lastname@example.org my own… hehe. Both are sending back the mail headers and the first one also shows you […]
I hate it when I keyed in a password on a shell prompt and pressed enter already. This is short, easy to remember and doesn’t do nasty things like editing your history file… PS: Works definitely with bash, dont know about others.
Two factor authentication with OTP – as provided by YubiKey – makes you sleep well at night again. I recently figured that these substantially increase your password security – with what you know and what you have. They are very easy integrated into PAM – and the good news is […]
I recently got this T-Shirt on Hurricane Electric’s website:
I have to add a correction to my previous article “Enabling HSTS on nginx“: You can and should enable it on http as well, so that visitors of your website offer from this additional security benefit as well – when they come back.