The HMAC stands for “Hash-based Message Authentication Code” and it could be based on the previous hash functions explained before to calculate it. It serves for integrity and authentication of a message when using symmetric encryption or any shared secret…
The symmetric encryption is the most used cryptographic operation to protect the confidentiality of the information whether it is personal information or corporate sensitive data. The main reason why symmetric encryption is preferred in most of the cases instead of…
This post will show how to convert certificates or keys between the 2 possible formats available for this kind of files with openssl: PEM or DER. But, before jumping in, let’s explain what PEM or DER stands for. What is…
In this post it will describe the locate command, which is a great tool to search files and directories in the system. This command does not work alone and needs to be helped by another one called updatedb used to…
The touch is one of the most basic Linux commands for empty file creation and for changing the file metadata timestamps. You normally don’t need to install it specifically because it comes with the Linux system. The touch syntax command…
I’m pleased to present to you in this post one of my favourite tools for Malware scanning called Virustotal. This is such a great tool, community based and free to use (although there is a paid license plan) that most…
This basic command it’s one of the most used when working with a Linux shell which brings a lot of powerful options to search text like the use of regular expressions. So in this post, it will be explained how…
The cat command is another basic and frequently used from Linux and it’s very useful when it comes to view files, create new ones, modify or combine them. The cat command syntax The syntax of the command is the following:…
The ls command is one of the most basic in Linux and serves for listing files and directories in the OS. In this post it will describe the command options and how to use it with some use cases. The…
OpenSSL it’s a versatile tool for cryptographic operations ranging from hash functions, encryption, digital signature and so on. This post will provide command examples to run the tool for generating a key pair for asymmetric cryptography with the well known…
