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Entries for the ‘Security’ Category

TIP: GDM Server authentication error message

Today while was I transferring one of my Debian partitions to another hard drive using “tar” command, I happened to get the following message when I tried to boot from the hard drive on which I moved my partition. Server authorization directory (daemon/ServAuthDir) is set to /var/lib/gdm but does not exist. Please correct GDM configuration […]

GPG/PGP-Part 6: Review and Conclusion

Welcome to final part (Part 6) of GPG/PGP Key series. In this part we will review what we have seen so far in the previous parts and also will look at some of the important commands. Part 1: Generating GPG/PGP keys on Debian Linux In Part 1, we saw how to generate your first keypair […]

GPG/PGP Keys-Part 5: Backing up, Restoring, Revoking and Deleting your GPG/PGP keys in Debian

Welcome to Part 5 of GPG/PGP Key series. What we will learn: This is one of the most important part of the entire series. We will learn how to manage our GPG keys – Backing it up, Restoring and Revoking (if need arises). Essentially this part should have come way before any other part¬† of […]

GPG/PGP Keys-Part 4: Signing/Encrypting a file using GPG/PGP key

Welcome to Part 4 of GPG/PGP Key series. What we will learn: In last part we saw how to verify an encrypted sign (.sign) file to confirm if the files and their MD5SUMS were uploaded by the right person. In this part we will learn how to create those encrypted sign file so that your […]

GPG/PGP Keys-Part 3: Verifying Debian ISO images encrypted sign file

Welcome to Part 3 of GPG/PGP Key series. What we will learn: In this part we will learn how to verify the encrypted signature file that is commonly found on web servers which offers download services. Example: Suppose you decide to download the Debian’s NetInstaller CD from Debian HTTP servers. Now you will notice that […]

GPG/PGP Keys-Part 2: How to send and receive encrypted files using GPG key

Welcome to the Part 2 of GPG/PGP Key series. What we learnt already: In Part 1 we saw how to generate our own unique GPG key in Linux and how to register your key to GPG keyservers. What we will learn: In this part we will learn how to use those keys to send and […]

GPG/PGP Keys-Part 1: Generating GPG/PGP keys on Debian Linux

Welcome to the Part 1 of GPG/PGP Key series. What we will learn: In this part we will learn how to generate your first GPG/PGP key and also how to register our key to the GPG keyservers. Step 1: Install gnupg package First we need to install the gnupg package so that we have necessary […]

Announcement: GPG/PGP Key Series

What’s all the HOOPLA about: I am glad to announce that we will soon be starting a series on GPG/PGP Key. Using GPG signature has become a standard practice for secure communication over Internet when sending emails, files, etc. to other people, especially in Open Source world. So it is very essential that we learn […]

Info: Verifying MD5 checksum on Windows

Purpose: This post is a follow-up of MD5SUM for ISO images post, in which we primarily learned how to generate MD5 checksums for your ISO images. In this post, we will learn about some of the available tools that you can use to verify those ISO images by running a check of their MD5 checksum […]

HOWTO: Encrypting a shell script on a Linux or Unix based system

Purpose: This blog entry will explain how to encrypt a shell script on your Linux or a Unix based system. Although there might be other ways to encrypt your shell script I found this one the most easiest to use. We will encrypt the script using the shc utility.  I have been using this utility since last 3 years and it works great in

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