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The importance of end-to-end encryption

Updated: Jun 20, 2023

With the spread of instant messaging applications, social networks and online services, the exchange of personal and confidential information has become commonplace in our daily lives. However, this convenience also exposes our information to potential threats.

What is end-to-end encryption and how does it work?

End-to-end encryption is a data protection method designed to ensure the security and privacy of electronic communications. It is a type of cryptography in which only the senders and receivers of the messages have access to the transmitted information, and no intermediary can read or decipher the content of the communication.


In this type of encryption, data is encrypted by the sender before being sent and can only be decrypted by the final recipient. Data remains encrypted the entire way, even when traversing networks and servers. It is used in many messaging apps and online communication services to bring complete security of conversations. It also prevents service providers, governments or hackers from intercepting and reading messages.


Below is an overview of how it generally works:

  • Encryption key: Each user involved in the communication has a unique encryption key. This key is used to encrypt and decrypt messages.

  • Encryption on Source Device: When a sender sends a message, it is encrypted on the source device using the recipient's encryption key. Encryption then turns the original message into unreadable text called "ciphertext".

  • Message transmission: The encrypted message is transmitted securely over a communication channel, such as the Internet. During this process, if someone intercepts the message, it will remain unreadable.

  • Decryption on target device: Upon reaching the target device, the encrypted message is decrypted using the recipient's corresponding encryption key. Decryption reverses the encryption process, turning the ciphertext back into the original readable message.

Source: Atsign

Services that use end-to-end encryption


A popular example of an application that uses end-to-end encryption is WhatsApp. When you send a message via WhatsApp, it is encrypted on the sender's device and can only be decrypted by the recipient's device, without the WhatsApp server having access to the content of the message.

This encryption approach is considered one of the safest ways to protect the privacy of electronic communications, as it significantly limits the possibility of unauthorized access to transmitted data.


However, it should be remembered that end-to-end encryption only protects the message content, not necessarily guaranteeing the security of other aspects of the communication, such as metadata (information about who is communicating, when and for how long) or the security of users' devices. Some other services that use end-to-end encryption are:

  • Signal: Signal is a messaging app known for its security and privacy and is widely used by activists and privacy advocates.

  • iMessage: iMessage is Apple's messaging service and with end-to-end encryption, messages sent between Apple devices are securely encrypted, bringing privacy to conversations.

  • Telegram (Secret Chat): Telegram offers a feature called "Secret Chat", which are optional and must be activated individually for each conversation.

  • ProtonMail: ProtonMail is an email service where emails sent between ProtonMail accounts are encrypted on the sender's device and can only be decrypted on the recipient's device.

Why End-to-End Encryption Matters


There are several reasons why end-to-end encryption is important:

  1. Censorship and Free Speech: End-to-end encryption plays an important role in protecting free speech, especially in countries where there is government censorship or excessive monitoring. It allows people to communicate freely without fear of reprisal or harassment.

  2. Trust in platforms: When a platform or messaging service uses this type of encryption, it demonstrates a commitment to the privacy and security of those using it. This helps build trust between the platform and users, as there is the knowledge that information about them will be preserved.

  3. Data Integrity: End-to-end encryption also ensures data integrity, ie it verifies that information has not been modified during transmission. Any changes to the encrypted data will result in an authentication failure, alerting the recipient that the message has been compromised.

  4. Privacy: With this form of encryption, users' privacy is guaranteed, allowing them to communicate confidentially and securely. Only the sender and recipient will be able to access what the message says, making unauthorized people unable to monitor or obtain private information.

  5. Security against eavesdropping: Messages will be protected during transmission using end-to-end encryption. Thus, it will prevent messages from being intercepted and read by malicious individuals. The data will be unreadable without the correct encryption key even if someone manages to gain access to the communication.

However, we must not forget that end-to-end encryption can be subject to criticism when used by those with malicious intent, such as terrorists or criminals. This subject raises debates about the balance between privacy and public safety, and as such, it is a challenge faced by governments and organizations around the world.


In summary, the widespread adoption of end-to-end encryption is essential to safeguarding the privacy and protecting the digital communications of users around the world. Through this technology, it is possible to establish a robust security layer that prevents interception and unauthorized access to messages, guaranteeing the confidentiality of transmitted data. End-to-end encryption is an effective answer to growing cybersecurity challenges and a crucial measure for maintaining freedom of expression, privacy and protecting individual rights in the digital age.


Did you already know about end-to-end encryption? Tell us here in the comments!

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