Encryption
Zero-Knowledge vs End-to-End Encryption: What's the Difference?
End-to-end encryption is about communication: only the sender and recipient can read a message, not anyone in between. Zero-knowledge is about storage and the provider: the company holding your data can't read it, because it never has the keys. They overlap, and one service can be both.
End-to-end encryption is about communication: only the sender and the recipient can read a message, not anyone in between. Zero-knowledge is about storage and the provider: the company holding your data can't read it, because it never has the keys. They overlap, and one service can be both, but they answer different questions.
People use the two terms as if they compete. They don't, really. They're pointing at different parts of the same goal.
End-to-end encryption: who can read it on the way
End-to-end encryption is a property of a conversation. When you send a message on Signal or WhatsApp, it's scrambled on your device and can only be unscrambled by the person you sent it to. The service carrying it in the middle can't read it. The question it answers is: while this data travels between two people, can anyone in between see it? With end-to-end encryption, no.
Zero-knowledge: who can read it once it's stored
Zero-knowledge is a property of the relationship between you and a provider that stores your data. The provider holds your information in encrypted form and never holds the keys, so it can't read what it's storing. This is the idea behind encrypted cloud storage and password managers. The question it answers is: once my data is sitting on their servers, can the provider read it? With zero-knowledge, no.
They overlap, so don't pick
Because both involve data being readable only by the right people, the terms often blur together, especially for stored data. A single service can be end-to-end encrypted for the exchange and zero-knowledge for the storage at the same time.
One caution: "zero-knowledge" isn't a precise guarantee the way "end-to-end encryption" is, and it gets used loosely in marketing. So don't ask which label is "more secure." Ask what each one actually covers.
The two questions, side by side
| End-to-end encryption | Zero-knowledge | |
|---|---|---|
| Core question | Can anyone between sender and recipient read it? | Can the provider read what it stores? |
| Classic example | Signal, WhatsApp messages | Encrypted storage, password managers |
| Protects mainly | Data moving between two parties | Data at rest, from the provider |
| Who holds the key | The endpoints | You, never the provider |
| Can a tool be both? | Yes | Yes |
How to think about it
Don't treat this as a choice. Ask two plain questions of any tool that handles sensitive data. Who can read this while it's moving? And who can read it once it's stored? A serious tool has a good answer to both.
Where doconvoy fits
doconvoy covers both questions. The exchange itself is end-to-end encrypted, so the content is readable only at the two ends, and the stored payload is ciphertext doconvoy can't read. You don't have to trade the in-transit protection against the at-rest one; you get both.
End-to-end encrypted in the exchange, stored as data we can't read.
Protected in transit and at restRelated: Zero-knowledge encryption, explained without the jargon · What zero-knowledge encryption protects, and what it doesn't · Why doconvoy can't read your data · Receive client credentials
Common questions
Are zero-knowledge and end-to-end encryption the same thing?
They overlap but emphasise different things. End-to-end encryption is about a message being readable only by the sender and recipient, not by anyone in between. Zero-knowledge is about a provider being unable to read the data it stores for you. A single service can be both, and for stored data the terms are often used interchangeably.
Which is more secure, zero-knowledge or end-to-end encryption?
That's the wrong question, because they answer different ones. End-to-end asks who can read data while it moves between two people. Zero-knowledge asks who can read it once it's stored with a provider. A tool handling sensitive data ideally satisfies both rather than choosing one.
Is 'zero-knowledge' a precise technical term?
Not really. Unlike end-to-end encryption, 'zero-knowledge' doesn't pin down a specific security guarantee, and the security community treats it loosely. Focus on the underlying property: is the data encrypted before it reaches the provider, and does the provider ever hold the key?