End to End Encryption Explained

Definition:
End-to-end encryption is a secure method of transferring data from one end device to another without allowing third-party interference.
End-to-end encryption (E2EE) is a method of secure communication that prevents third-parties from accessing data while it's transferred from one end system or device to another.

In E2EE, the data is encrypted on the sender's system or device and only the recipient is able to decrypt it. Nobody in between, be they an Internet service provider , Application Service Provider or hacker, can read it or tamper with it.

The cryptographic keys used to encrypt and decrypt the messages are stored exclusively on the endpoints, a trick made possible through the use of public key encryption. Although the Key Exchange in this scenario is considered unbreakable using known algorithms and currently obtainable computing power, there are at least two potential weaknesses that exist outside of the mathematics. First, each endpoint must obtain the public key of the other endpoint, but a would-be attacker who could provide one or both endpoints with the attacker's public key could execute a man-in-the-middle attack. Additionally, all bets are off if either endpoint has been compromised such that the attacker can see messages before and after they have been encrypted or decrypted.
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