PIX: What are the possible uses of cryptography?

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This question Pix appartient à la catégorie “Protection et sécurité : Sécuriser l’environnement numérique” et porte sur les rôles concrets de la cryptography in the digital world. Find out in this article.

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Which of the following are possible uses of cryptography? [Discover the answer]

Here's how the question looks on Pix:

Pix statement on cryptography and the digital world. ©Christina for Alucare.fr

Statement : Which of the following are possible uses of cryptography?


Qu’est-ce que la cryptographie ?

The cryptography est l’art de protect messages pour qu’ils ne puissent être compris que par ceux à qui ils sont destinés. L’idée est d’éviter que le message soit lisible par les curieux et donc d’écrire en coded. Only he who knows the secret key can decipher it.

It is based on several fundamentals:

  • the encryption and the decryption
  • cryptographic hash functions
  • le principe d’authentification

Example :

Message d’origine : “Hello
Message chiffré : “Cpokvs

Dans les systèmes d’information, la cryptographie est donc un outil fondamental pour protéger les échanges, assurer le principe d’authentification et se défendre contre les menaces numériques. ©Christina pour Alucare.fr

From a technical standpoint, cryptography is based on mathematical algorithms designed to encrypt and decrypt data securely. It uses keys according to asymmetrical methods :

  • Public key for encryption
  • Private key for decryption

For the symmetrical method, a same key is used for encryption and decryption.

In both cases, cryptographic mechanisms ensure that only authorized recipients can access encrypted data.

Cryptography transforms a readable message into an encrypted one to protect it from prying eyes. ©Christina for Alucare.fr

The cryptography is used in many IT systems to guarantee security. EFor example, it can be used to :

  • Data protection on the Internet (e-mail, payments, passwords).
  • Vérifier l’identité using a public key.
  • Garantir que des messages n’ont have not been modified using hash functions or digital signatures.

Dans le tableau suivant, vous trouverez les dates clés de l’histoire de la cryptographie :

Date Event
Around 2000 BC The Egyptians used modified hieroglyphs to hide the meaning of certain texts.
Around 50 BC Julius Caesar created a simple coding system: the Caesar cipher.
16th century The Vigenère cipher is developed, making messages more difficult to decipher.
1976 Naissance de la cryptographie moderne avec l’idée de la clé publique et privée (Diffie et Hellman).
1977 Création de l’algorithme RSA, encore utilisé aujourd’hui pour sécuriser les données via le chiffrement.
Today Cryptography is everywhere: on the Internet, in our phones, on our credit cards, etc.

Quels sont les bénéfices et les risques liés à l’usage de la cryptographie ?

Cryptography is a very useful tool for protecting our data personal and professional. It is at the heart of computer security. But like any technology, it can also cause problems if misused or abused.

Benefits (Avantages) Risks (Disadvantages)
Protect your privacy personal and professional data. Can be used by criminals to hide their activities (cybercrime, terrorism).
Garantit l’intégrité messages (cannot be modified). Makes certain police investigations more difficult (messages unreadable without key).
Permet l’authentification grâce à une clé publique (vérifie l’identité d’un utilisateur ou d’un site web). If a private key is lost Where flight, il devient impossible d’accéder aux données.
Secure online payments and website connections using encryption (HTTPS). Some methods can become obsolete over time or be vulnerable to attack.
Protects communications (email, messaging, VPN, etc.). Can give a false sense of security if poorly implemented.

En somme, la cryptographie en général, qu’elle soit symmetrical Where asymmetricalplays a central role in the DATA SECURITY and the communications protection digital.

Pour garantir une protection optimale, il est essentiel d’adopter une rigorous safety practices. Il est possible de combiner la cryptographie symétrique avec d’autres méthodes adaptées aux besoins spécifiques des systèmes d’information.

Les techniques de chiffrement sont particulièrement efficaces pour protéger l’intégrité des données contre les altérations ou une entrée non autorisée. ©Christina pour Alucare.fr

What is Pix?

Pix is an online tool designed to help you better master the digital. Here you can answer questions on a wide range of topics: data and computer security, information retrieval and more.

The great thing is that the exercises adapt to your level as you go along. You progress at your own pace, and if you wish, you can obtain a recognized certification.

Pour conclure, sachez que la cryptographie est utilisée partout autour de nous, souvent sans qu’on s’en rende compte. Elle est essentielle pour assurer la computer security and protect data via encryption, using public and private keys.

Et si vous souhaitez continuer à vous entraîner aux tests PIX, n’hésitez pas à consulter les articles suivants sur notre site :

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Released on : September 1, 2017

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