Introduction

In today’s digital age, information is invaluable, and encryption serves as a crucial means to protect it.
Specifically, end-to-end (E2E) encryption has transformed how human rights organizations, law enforcement, and technology companies handle sensitive information.

What is Encryption?

Encryption Definition: Encryption involves transforming consumable information into an unconsumable form based on specific rules. Different encryption methods exist, providing varying levels of security.
Example of DES: The Data Encryption Standard (DES) encrypts text like “ice cream” to a garbled form with a specified key, such as “kite” or “motorcycle.”
Key Importance: A key serves as the means to unlock (decrypt) encrypted text, ensuring that only authorized individuals can access the original information.

E2E Encryption Defined: E2E encryption focuses on specific locations through which information travels. In a messaging app, for instance, E2E encryption ensures that messages are encrypted both during transmission and storage, only decrypted when received by the intended recipient.
Protection in Transit and at Rest: E2E encryption safeguards information during transmission and while stored on servers, providing comprehensive protection.

Symmetric Encryption: The same key is used for both encryption and decryption. Examples include DES and Advanced Encryption Standard (AES).
Asymmetric Encryption: Different keys are used for encryption and decryption. Public and private key pairs, such as Curve25519, exemplify asymmetric encryption.

Hash Function Properties: Hash functions encrypt messages with properties like non-reversibility, fixed-length output, and uniqueness for unique inputs.
Example of DES Hash Function: DES uses a complex process, including S-boxes, to encrypt messages.

MITM Attacks: A man-in-the-middle (MITM) attack involves intercepting messages by acquiring encryption keys. Countermeasures include fingerprint comparison to detect tampering.
Complacency Risks: Users may become complacent, assuming total security. However, malware and backdoors can compromise device security, allowing unauthorized access.
Metadata Surveillance: While E2E encryption secures message content, surveillance can occur through metadata analysis, revealing information about message timing, recipients, and locations.
Backdoor Risks: Companies implementing E2E encryption may install backdoors, enabling access for legal or illicit purposes. Examples, like the Snowden affair, highlight potential misuse.