# How Does End-to-End Encryption Really Work?

Most cloud storages out there aren't truly private. Learn how end-to-end encryption works and how DragBin keeps your files secure even against future quantum threats.

## What Is End-to-End Encryption (E2EE)?

End-to-End Encryption, or E2EE, is a way of protecting data so that only the sender and the intended recipient can read it. The data is encrypted on the sender's device and is only decrypted later on the recipient's device. Apart from these, no one in between, not even the service provider can read or access your content.

E2EE differs from standard encryption where data might be protected during transfer but still accessible to the platform storing it. With E2EE, the platform itself cannot decrypt your files or messages.

## The Mechanics Behind E2EE

In E2EE, data is encrypted on the sender's device using the recipient's public key, converting it into unreadable ciphertext before it ever leaves the device. Only the corresponding private key, stored securely on the recipient's device, can decrypt it.

## Standard Encryption vs End-to-End Encryption

- **Where encryption happens** — In transit (TLS) or at rest on servers vs. on the user's device before transmission.
- **Who can decrypt** — Service provider holds keys vs. only sender and intended recipient.
- **Key management** — Provider-managed vs. private keys remain on user devices.
- **Breach exposure** — Data may be exposed vs. data remains protected unless endpoints are compromised.
- **True privacy** — No vs. Yes.

## How DragBin's E2EE Works

Files are encrypted on your device before upload and the keys are never visible to DragBin. Files remain encrypted in transit and at rest with complete metadata protection — DragBin cannot see your passwords, files, filenames or any other content.

## The New Threat: Encrypted Doesn't Mean Safe

In 1994, Peter Shor proved a sufficiently powerful quantum computer could break public key cryptography. Google indicates practical quantum computers may arrive by 2029. Attackers are already using "Harvest Now, Decrypt Later":

- Data is intercepted and stolen today
- Stored indefinitely in encrypted form
- Decrypted in the future once quantum capabilities mature

## DragBin's Quantum Resistant Encryption

- **MLKEM Key Encapsulation** — quantum-resistant key encapsulation mechanism for asymmetric key exchanges.
- **AES-256 Encryption** — 256-bit symmetric encryption in transit and at rest.
- **Argon2 Key Derivation** — Password Hashing Competition winner; derives keys from your password with high computational cost.

## Who Needs End-to-End Encryption Apps?

Creators and video editors, legal teams, finance professionals, healthcare providers, military and defense, enterprises, agencies, and freelancers.

## E2EE Benefits

- **True Privacy** — only communicating endpoints can access the data.
- **Data Ownership** — exclusive control over encryption keys.
- **Zero Trust Dependency** — servers never handle decrypted data.

## Related

- [Client-side encryption](/client-side-encryption)
- [Harvest now, decrypt later](/harvest-now-decrypt-later)
- [Post-quantum encryption](/post-quantum-encryption)
- [Zero-knowledge encryption](/zero-knowledge-encryption)
- [Security architecture](/security)