Free and Open Source blogger with an attitude
computer security related topic
Just sharing, I just found out about this handy SHA1 and MD5 hash lookup website. What’s makes this different from several other reverse hash lookup websites is because this website allows you to lookup several line of hashes, thus saving time at the same time.
Hope this would be useful for you…
I’ve keep getting the message “ssh_exchange_identification: Connection closed by remote host error” after I managed to finalized my CRUX linux on my decTOP box today. After enough looking into documentations, I finally found out that I need to edit the “/etc/hosts.allow” file to allow SSH connection, for example:
#/etc/hosts.allow
sshd:ALL
or for more conservative setting
#/etc/hosts.allow
sshd:LOCAL
sshd:192.168.1.0/255.255.255.0
I can connect ssh to my box normally after that.
Here’s a video showing you how to crack Wireless WEP keys using Backtrack 4 and aircrack-ng.
Additionally, you need a compatible wireless adapter or compatible wireless chipset which can be used with aircrack-ng.
Here are the list of the best wireless cards to use(according to aircrack-ng wiki):
Good luck!
Although it is a security risks, it is possible to make OpenSSH listens on multiple port.
To do that, you need to edit /etc/ssh/sshd_config file. and enable the “GatewayPorts” option.
AllowTcpForwarding no GatewayPorts yes X11Forwarding no #X11DisplayOffset 10
Look for the line that contain “Port 22”, and uncomment it if necessary, and add additional Port line to enable OpenSSH to listen to other ports. Like this:
Port 22 Port 80 Port 1025
The example will enable OpenSSH to listen to port 22,80,1025 simultaneously. Don’t forget to restart SSH service to enable the change by running :
sudo /etc/inet.d/sshd restart
Warning: Running SSH on multiple port may cause security risk, you have been warned!
Recommended Reading
Here’s an easy way to encrypt your file using OpenSSL. The general syntax is:
openssl enc (cipher) -e -in (input file) -out (output file)
so to encrypt a “plaintext.txt” file, using aes256, you only need to run this command:
openssl enc aes256 -e -in plaintext.txt -out encrypted.txt
Similarly, to decrypt the file, you can run the command:
openssl enc aes256 -d -in encrypted.txt -out decrypted.txt
One of the factor that makes your system easily crackable is the weak password. PAM cracklib forces users to choose stronger password by analyzing the password strength, length and entropy.
To enable pam_cracklib in Debian / Ubuntu operating system, you need to install libpam_cracklib:
sudo apt-get install libpam_cracklib
Then edit the “/etc/pam.d/common-password” file using your favorite editor. Then, add and uncomment the following line at the end of the file.
password required pam_cracklib.so retry=3 minlen=6 difok=3
difok determines the number of same characters that allowed to be present in the old and new passwords.