Security - PowerCram Blog

Securely delete files in Windows

The only way to ensure that deleted files, as well as files that you encrypt with EFS, are safe from recovery is to use a secure delete application. Secure delete applications overwrite a deleted file’s on-disk data using techiques that are shown to make disk data unrecoverable, even using recovery technology that can read patterns in magnetic media […]

Securing SSH on Linux

SSH (Secure Shell) is a protocol which supports logging into a remote system or executing commands on a remote system, using an encrypted communication between the two systems. By default SSH is running version 1 and allowing direct root access to the system. You should disable direct root access on the sshd_config file and use only protocol 2 […]

How to delete files securely in Linux

How to remove files securely so that it cannot be undeleted. Peter Gutmann paper “Secure Deletion of Data from Magnetic and Solid-State Memory” has very good information. Here are some commands/tools available under Debian GNU/Linux (it should work with other Linux distributions) to delete file securely. srm: Securely remove files or directories This command is a replacement for […]

Wireless WPA/WPA2-PSK GPU Cracking with Pyrit – How to Use Pyrit in BackTrack

Pyrit is a GPU cracker for attacking WPA/WPA2 PSK protocols. It allows to create massive databases, pre-computing part of the WPA/WPA2-PSK authentication phase in a space-time-tradeoff.  Pyrit works with many platforms including CUDA, ATI-Stream, OpenCL and VIA Padlock. How toListing available cores pyrit list_cores Determining performance of cores pyrit benchmark Create a new ESSID pyrit -e Linksys create_essid […]

Root Access Email Alert

Get notified when a user logs in with root privileges. 1) Edit .bashrc under /root to get notified by email when someone logs in as root 2) Add the following: echo ‘ALERT – Root Shell Access (Server Name) on:’ `date` `who` | mail -s “Alert: Root Access from `who | cut -d”(” -f2 | cut -d”)” -f1`”

How To Install Backtrack4 Using Grub On Ubuntu

Backtrack is an operating system that is specially designed for networking security. Bactrack OS is based on Linux. As of this writing the latest version of Bactrack is Backtrack4 with many, many useful applications. Before installing BT4, make sure you have installed Ubuntu on your computer so we can use Ubuntu’s Grub for booting. Follow these steps to install and configure dual booting Ubuntu / Backtrack4. Prepare your […]