Encryption is a procedure that allows data to be modified so that it can be read and interpreted only by users who have the correct reading key. When data is encrypted, usually using a particular algorithm, this data becomes inaccessible to unauthorized users, thus its security is significantly increased.
Encryption: What it is and why it is important in everyday life
Encryption is a procedure that allows data to be modified so that it can be read and interpreted only by users who have the correct reading key. When data is encrypted, usually using a particular algorithm, this data becomes inaccessible to unauthorized users. Their security, therefore, is significantly increased.
How it works
Encryption itself is a very simple process. A specially created algorithm modifies the data's source code by replacing characters; at the same time, a key is generated, which allows the data to be decrypted and restored to its original form. Therefore, both the data and the key must be in the possession of the end user who wishes to read the data: without the key, the data remains protected from prying eyes.
There are two main types of encryption that can be used: symmetric encryption and asymmetric encryption. In the first case, there is only one key, while in the second we have two different encryption keys, one public and one private. There are also other much more complex encryption methods, such as quantum cryptography, which however have not yet spread widely.
Symmetric encryption
When using this type of encryption, a single key is generated that allows both encryption and decryption of data. This key must be in possession of both the sender and the recipient. Among the most commonly used algorithms for this purpose is the Advanced Encryption Standard (AES), which is based on 128-bit, 192-bit, and 256-bit keys, depending on the desired level of security.
Symmetric encryption is very easy to implement, but less secure than asymmetric encryption: the key must be sent to the recipient along with the data, with the risk that some malicious person intercepts the communication and thus finds himself able to decrypt the data itself.
Asymmetric encryption
With this type of encryption you have two different keys: a public one and a private one, linked together by some particular characteristics. Both the public and private keys can be used to encrypt data, but to decrypt it you need to use the opposite type of key.
This procedure allows for greater security: the need to have two different keys makes it much more difficult for an attacker to be able to get hold of both. The disadvantage of this method, however, is that it is slow. Furthermore, if you are not sure of the secure origin of the public key, you could be the victim of an upstream deception.
What is encryption used for?
Encryption is essential to protect your privacy and ensure the security of your data. It is used by most messaging apps, email providers, and email service providers. VPN, cloud services, etc. It is also a fundamental element in the corporate environment, where protecting data is always a priority.
The use of encryption shouldn't be scary: it's a widely used security solution, one that everyone has encountered without even realizing. When browsing the Internet, for example, many pages are protected by encryption: you can usually recognize them by the presence of a padlock in the address bar. In particular, all those sites that require users to enter personal data use encryption (or should).
Another typical example is Wi-Fi connections: when you protect your network with a password, you're simply encrypting access to the network. Or, every time you send a message via WhatsApp, it will be encrypted. This is called end-to-end encryption, a special type of encryption that guarantees that only the sender and recipient have the necessary encryption keys.
Using encryption therefore allows you to protect your data from prying eyes, and therefore also from potential hacker attacks.. Not only that: by regularly backing up your data and protecting it with an encryption key, you can also limit the damage resulting from any attacks. ransomware, since even malware is unable to act on data protected in this way.
Changes and revisions to this article
- Article updated on 24/11/2025 at 19:33 PM - Title typo corrected
- Article updated on 02/12/2025 at 14:32 PM - Content typo corrected
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