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guides/encrypt-messages-version-1.md
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@ -8,19 +8,19 @@ You can find more details about Waku Message Payload Encryption in [26/WAKU-PAYL
## What data is encrypted ## What data is encrypted
With waku Message version 1, the payload is encrypted. With Waku Message Version 1, the entire payload is encrypted.
Which means that the only discriminating data available in clear text is the content topic and timestamp (if present). Which means that the only discriminating data available in clear text is the content topic and timestamp (if present).
Hence, if Alice expects to receive messages under a given content topic, she needs to try decrypting of all messages received on said content topic. Hence, if Alice expects to receive messages under a given content topic, she needs to try to decrypt all messages received on said content topic.
This needs to be kept in mind for scalability and forward secrecy concerns: This needs to be kept in mind for scalability and forward secrecy concerns:
- If there is high traffic on a given content topic then all clients need to process said traffic; - If there is high traffic on a given content topic then all clients need to process and attempt decryption of all messages with said content topic;
- If a content topic is only used by a give (group of) users then it is possible to deduce some information about their communication such time and frequency of messages. - If a content topic is only used by a given (group of) user(s) then it is possible to deduce some information about said user(s) communications such as sent time and frequency of messages.
## Key management ## Key management
By using Waku Message Version 1, you will need to provide a way for your user to generate and store keys in a secure manner. By using Waku Message Version 1, you will need to provide a way to your users to generate and store keys in a secure manner.
Storing, backing up and recovering key is out of the scope of this guide. Storing, backing up and recovering key is out of the scope of this guide.
<!-- TODO: Subtle Crypto link once it's back up https://github.com/mdn/content/issues/8314 --> <!-- TODO: Subtle Crypto link once it's back up https://github.com/mdn/content/issues/8314 -->
@ -31,12 +31,12 @@ Whether you should use symmetric or asymmetric encryption depends on your use ca
**Symmetric** encryption is done using a single key to encrypt and decrypt. **Symmetric** encryption is done using a single key to encrypt and decrypt.
Which means that if Alice knows `K` and use it to encrypt a message, Which means that if Alice knows the symmetric key `K` and uses it to encrypt a message,
she can also use `K` to decrypt any message encrypted with `K`, she can also use `K` to decrypt any message encrypted with `K`,
even if she is not the sender. even if she is not the sender.
Group chats is a possible use case for symmetric encryption: Group chats is a possible use case for symmetric encryption:
All participants can use an out-of-band method to determine `K`. All participants can use an out-of-band method to agree on a `K`.
Participants can then use `K` to encrypt and decrypt messages within the group chat. Participants can then use `K` to encrypt and decrypt messages within the group chat.
Participants MUST keep `K` secret to ensure that no external party can decrypt the group chat messages. Participants MUST keep `K` secret to ensure that no external party can decrypt the group chat messages.
@ -48,7 +48,7 @@ For Alice to encrypt a message for Bob, she needs to know Bob's Public Key `K`.
Bob can then use his private key `k` to decrypt the message. Bob can then use his private key `k` to decrypt the message.
As long as Bob keep his private key `k` secret, then he, and only he, can decrypt messages encrypted with `K`. As long as Bob keep his private key `k` secret, then he, and only he, can decrypt messages encrypted with `K`.
Private messaging is a possible use case for aasymmetric encryption: Private 1:1 messaging is a possible use case for asymmetric encryption:
When Alice sends an encrypted message for Bob, only Bob can decrypt it. When Alice sends an encrypted message for Bob, only Bob can decrypt it.
## Symmetric Encryption ## Symmetric Encryption
@ -77,7 +77,7 @@ See [Receive and Send Messages Using Waku Relay](relay-receive-send-messages.md)
import { WakuMessage } from 'js-waku'; import { WakuMessage } from 'js-waku';
const message = await WakuMessage.fromBytes(payload, contentTopic, { const message = await WakuMessage.fromBytes(payload, contentTopic, {
symKey: key, symKey: key
}); });
``` ```
@ -118,12 +118,12 @@ Symmetric keys or asymmetric private keys can be mixed, both decryption methods
```js ```js
// Using await syntax // Using await syntax
const messages = await waku2.store.queryHistory([contentTopic], { const messages = await waku.store.queryHistory([contentTopic], {
decryptionKeys: [key] decryptionKeys: [key]
}); });
// Using callback syntax // Using callback syntax
waku2.store.queryHistory([contentTopic], { waku.store.queryHistory([contentTopic], {
decryptionKeys: [key], decryptionKeys: [key],
callback: (messages) => { callback: (messages) => {
// Process decrypted messages // Process decrypted messages
@ -155,8 +155,8 @@ hence it is not needed to save it as long as as the private key can be recovered
### Encrypt Message ### Encrypt Message
The public key is used to encrypt messages, to do so, The public key is used to encrypt messages;
pass the key in the `encPublicKey` property to `WakuMessage.fromBytes`. to do so, pass it in the `encPublicKey` property to `WakuMessage.fromBytes`.
Same as clear Waku Messages, Same as clear Waku Messages,
`payload` is your message payload and `contentTopic` is the content topic for your dApp. `payload` is your message payload and `contentTopic` is the content topic for your dApp.
@ -240,13 +240,12 @@ const message = await WakuMessage.fromBytes(payload, contentTopic, {
console.log(message.payload); // This is encrypted console.log(message.payload); // This is encrypted
``` ```
However, `WakuMessage` instances returned by `WakuRelay` or `WakuStore` are decrypted, However, `WakuMessage` instances returned by `WakuRelay` or `WakuStore` are always decrypted.
if the correct decryption key is passed as explained previously.
`WakuRelay` and `WakuStore` never returned messages that are encrypted. `WakuRelay` and `WakuStore` never return messages that are encrypted.
If a message was not succesfully decrypted, then it will be dropped from the results. If a message was not successfully decrypted, then it will be dropped from the results.
Which means that `WakuMessage` instances returned by `WakuRelay` and `WkauStore` always a clear payload (in regard to Waku Message version 1): Which means that `WakuMessage` instances returned by `WakuRelay` and `WakuStore` always have a clear payload (in regard to Waku Message version 1):
```js ```js
const messages = await waku.store.queryHistory([contentTopic], { const messages = await waku.store.queryHistory([contentTopic], {