Recover encrypted ecryptfs home folder from encrypted dm-crypt luks disk volume

Whew… saved by the skin of teeth.

The grub2 bootloader of my computer got corrupt. I was not able to boot into the computer and all was lost. For security reasons, I set up LVM with full disk encryption. Thereafter, each user’s home folder was further encrypted with ecryptfs (the default you get when you . . . → Read More: Recover encrypted ecryptfs home folder from encrypted dm-crypt luks disk volume

How to disable user list and guest user login in Ubuntu 16.04 LTS

To disable the user list and guest user login in Ubuntu 16.04 LTS login screen, open a terminal window and do the following:

$ cd /etc/lightdm <enter> $ sudo mkdir lightdm.conf.d <enter> $ sudo cd lightdm.conf.d <enter> $ sudo mousepad 50-config.conf <enter>

Enter the text below into the file.

[SeatDefaults] greeter-hide-users=true greeter-show-manual-login=true allow-guest=false

Save the . . . → Read More: How to disable user list and guest user login in Ubuntu 16.04 LTS

How to calculate MD5 or SHA256 sums in Linux and Android

Many of us use Linux Distributions like Ubuntu, Fedora, available for free on the Internet. To install these distributions on our computers, we need to down their ISO files. Recently, the Linux Mint ISO was hacked and malware inserted into some of it’s files. It was then repacked and put up on an external website. . . . → Read More: How to calculate MD5 or SHA256 sums in Linux and Android

How to extend expiry date of Gnu Privacy Guard Keys (GPG/PGP) keys

When PGP/GPG keys expire, you have option to generate a sub key (if you think your key has been compromised), or you can extend the validity of the current key by extending it’s expiry period. You can extend the key’s expiry period since the keys are not compromised. To continue, Open a terminal window and . . . → Read More: How to extend expiry date of Gnu Privacy Guard Keys (GPG/PGP) keys

How to set up an isolated Guest WLAN on TP-Link WDR4300 with OpenWRT using command line

You have guests at your home and they want to use your wireless network to retrieve emails, etc off the Internet. This is not a unique situation, but is quite common everywhere, with the proliferation of devices and services that require Internet access. The only issue you face is that if you give them your . . . → Read More: How to set up an isolated Guest WLAN on TP-Link WDR4300 with OpenWRT using command line

Workaround to the Android Web Browser Vulnerability on old devices

If you are one of those who has an older Android device, you are vulnerable to the Android Web Browser vulnerability, whose patch may have not been released by your handset manufacturer. There is still hope for you to keep yourself safe and secure by any of the following methods:

Disable the internal default web . . . → Read More: Workaround to the Android Web Browser Vulnerability on old devices

Fix google-drive-ocamlfuse not able to get token error

The google-drive-ocamlfuse not able to get token error appears when using google-drive-ocamlfuse access to google-drive-ocamlfuse application to Google Drive has been revoked or not granted.

If the above error appears, delete the .gdfuse folder and a new token will be generated when google-drive-ocamlfuse application is run again. Open the file manager and remove the folder . . . → Read More: Fix google-drive-ocamlfuse not able to get token error

How to setup HTTPS for web interface in OpenWRT

By default, you can log in to the OpenWRT firmware installed on your router using http://192.168.1.1. However, if you want to add encryption on that connection, you need to be able to login using https://192.168.1.1. To do that, you need to enable HTTPS support on the router. To do so, open a terminal window on . . . → Read More: How to setup HTTPS for web interface in OpenWRT

How to revoke a GnuPG / GPG key in Linux

If your Gnu Privacy Guard or GPG or GnuPG key has been compromised or something has gone wrong, you can revoke your key. Make sure that you generated a revocation certificate and stored in a safe place to do so.

To revoke a key, open a terminal in Linux, and enter the following command: $ . . . → Read More: How to revoke a GnuPG / GPG key in Linux

How to generate a revocation certificate for your GnuPG / GPG key

Whenever you create a key pair using GNU Privacy Guard, you need to make sure you also generate a revocation certificate for your key. Sometimes, keys are lost, misplaced, deleted, passwords forgotten and so on. To ensure that you revoke the keys you created, you need a revocation certificate. Simply deleting a key file or . . . → Read More: How to generate a revocation certificate for your GnuPG / GPG key

September 2017
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