01Linux
Get HTTP headers
Most users are interested in the content they receive when they visit a web site. There is an extra information web clients and servers exchange - HTTP headers. HTTP
5 min read↗
CATEGORY ARCHIVE
Computer Security.
Practical knowledge, one discovery at a time.
18 ARTICLES
02Linux
Install free ssl certificates in Ubuntu
Free SSL certificates with Let's Encrypt certbot - tested in Ubuntu 14.04 with Apache 2.
4 min read↗
03Linux
Setup your own self signed Certificate Authority (CA)
How to be your own Certificate Authority(CA) with self signed certificates
3 min read↗
04Linux
AIDE installation and setup
AIDE is a host-based file and directory integrity checking tool, similar to Tripwire. It creates a snapshot of file details during initialization and stores them in
1 min read↗
05Linux
ngrep – insecure connections your browser is making
Ngrep is a very user friendly packet sniffer, basically the "grep" equivalent at the network layer.
2 min read↗
06Linux
Block all users from logging in to a system except for root
In some cases, you might want to block all users from logging in to the system or just after you login, you want to prevent everyone else from connecting to the serv
1 min read↗
07Linux
Ansible vault – how to encrypt sensitive data and decrypt it during playbook runs
Sooner or later, you will find yourself adding sensitive data into Ansible playbooks, host or group vars files.Such information might include MySQL DB credentials, A
3 min read↗
08Linux
Decoding firefox cookies – sqlite cookies viewer
Web sites store information on local machines of site visitors using cookies. On subsequent visits, the browser sends the data from the cookies on the visitors machi
3 min read↗
09Linux
Linux security tip of the day
Users accounts usually get created and removed on most Development or Production servers. It is not uncommon to simply delete the users and yet not either delete or
2 min read↗
10Linux
Could not chdir to home directory: Permission denied
Problem: every time a user logs in, they get "Could not chdir to home directory....Permission denied" error, although they can login to the system and change to thei
2 min read↗