SCHOOL_2.0/ecole_2.0

PENTEST What exactly is cybersecurity? Let me explain

PENTEST is short for pe*******on test. This is a very important exercise in the field of cybersecurity that allows you to simulate computer attacks in order to assess the security of a network system, a web application by looking for flaws, exploiting them as a real cybercriminal attack would do, but the intention here is not to harm the system.
It is important to know that this is part of what has been called ethical hacking or ethical hacking. It is important to know that in terms of cybersecurity, we have dark hacking, represented by cybercriminals who use their computer knowledge to harm information systems. In front of them, we have ethical hackers who protect information systems from cybercriminals and one of their methods is precisely the PENTEST which requires prior authorization from the organization, so they want to test the vulnerability of the system (important to have an authorization for legal coverage in case there are problems, never forget it).
In the PENTEST we have two teams called RED team and Blue team. The RED team specializes in intrusion attack testing. And the Blue team is specialized in defending the system. The Red team can sometimes work in different conditions such as in a black box, a grey box or a white box. These conditions generally depend on their knowledge of the system that is to be subjected to their pe*******on test. If they know the framework of the system whose vulnerability they want to test, we speak of a white box, if they know half of it, we will speak of a grey box, if they do not know the system at all, we will speak of a black box test.
The first thing to do usually in a black box test is to scan the system and most often use an application such as nmap. We'll talk about it at length later in a future capsule.

MARTIN GUILLAUME
TCHIO TCHINDA
Cybert security expert
Arlington heights 09/09/2025

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Difference between digital signature and digital certificate.
To elucidate this, we will use a metaphor.
It is important to know first of all that the digital signature is an element that accompanies the digital certificate in order to justify the authenticity of a website, a web server or a VPN server. And the digital certificate is a kind of digital file.
The digital certificate is like an identity document (a driver, license or passport) containing all the identifying information of a website (to take the case of the website. This means that the certificate contains, for example: the name of the site's domain, the name of the certificate authority, the public key and many others. And the certificate authority in order to justify the authenticity of the website proceeds to sign this digital certificate with a private key.
The issuance of the digital certificate and the imposition of the digital signature on the said certificate responds to two well-defined asymmetric cryptographic processes.
MARTIN GUILLAUME
TCHIO TCHINDA
Cyber security Expert
Arlington Heigths

Let's go back to the written word and talk about the AIs that generate written textual content, such as ChatGpt, Gemeni, Copilot, to name a few.
What you need to know about these artificial intelligences.
Are AI wrong?
AI is a powerful tool today used at least 80% in digital domains. It is important to know that these tools are driven every second by questions and web content that we produce on a daily basis. It's like a child who has been taught to walk, to calculate, to analyze, to interpret in order to become autonomous. It is exactly this figure that makes it possible to make a parallelism with these AIs, with the only difference that it takes repetition for the child to memorize what we would like him to learn.
Beyond anything else, it is important to know that these AIs basically work like search engines like Google, Yahoo and many others. Moreover, they draw some of the empirical knowledge from these search engines or websites. But unlike search engines, they also have the ability to collect information, process it, analyze it and finally interpret it in order to provide coherent and logical texts.
But not everything they produce is necessarily accurate. They can make mistakes and they sometimes make mistakes.
This is why it is important to know how to use it intelligently:
- Check your information,
- Keep a critical mind,
- Avoid simple copy and paste.
Be careful I'm not an AI expertMartin Guillaume
TCHIO TCHINDA
Arlington Heights 09/07/2025

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