#Nostr it's now live on #Nymchat ...enhanced NIP-17 group chats. In Nymchat, group chats are end-to-end encrypted using NIP-44 + NIP-17 gift wraps. Now on Nymchat, when you create a group, it uses rotating ephemeral recipient keys for enhanced privacy. This means each member generates a fresh ephemeral keypair when they send a message, and the new pubkey is advertised inside the encrypted rumor. Future messages to that member use their ephemeral key instead of their real pubkey, reducing the attack surface for honeypot relay correlation of group membership through timing attack.

Pseudonymously Chat with Nymchat

Ephemeral pseudonymous chat messaging over Nostr. Bridged with Bitchat geohash channels.

This commit of Nymchat (that isn’t being used in the live version) has a rebuild of NIP-17 group chats where everyone in the group uses ephemeral keys on every sent message to “key hop” and the app tracks and updates their addresses. This prevents a honeypot relay from inferring group membership, since not only is every giftwrap sent from an ephemeral key (per spec) it is then also sent to an ephemeral key. In each message inside the encrypted message it states the next key that will be used, so others know what next address to use. It’s not wholly stable, which is why it’s not live now. Some of the group member keys might become stale, and not sync to each other, causing some message delivery/retrieval problems. But, I wonder if some bigger brains might want to help with it?

GitHub

v3.58.271 · Spl0itable/NYM@b3e4bd1

A feature-rich, ephemeral chat client built on Nostr protocol, bridged with Bitchat for pseudonymous, temporary messaging. - v3.58.271 · Spl0itabl...

Sadly, I have reverted course for the time being and removed the Marmot Protocol for MLS encrypted group chats on #Nymchat. It appears to be far too experimental than I realized at this time and needs further testing, tuning, etc. A lot of folks couldn't get the messages to work or some people could publish a keypackage and others not making invites janky. It also seems unreliable for any sort of restore state, which caused the group to become corrupted. It's also disappointing that only a single admin in the commit can invite/kick members unless all group members are admins. I need to keep tinkering to see if it's worth pursuing further, but for the now the battle-tested NIP-17 group chats work beautifully. They of course, just come with the caveat of possible timing attacks that might infer group member pubkeys and there's no forward secrecy. However, the message contents of NIP-17 group chats are still e2ee. I just wouldn't recommend them for absolute mission-critical comms. Otherwise, shitposting with your friends is fine.

Pseudonymously Chat with Nymchat

Ephemeral pseudonymous chat messaging over Nostr. Bridged with Bitchat geohash channels.

New #nymchat v3.58.262 released, which includes a new friend system for more granular control over some settings such as notifications, PMs and group chat invites, and image blur. From the context menu, when clicking a user's nickname, there is a new "Add Friend" button. You can then manage your friend list from the settings modal, above blocked users. Friends also get a new "friend" flair badge next to their nicknames, to easily spot them across channels.

Pseudonymously Chat with Nymchat

Ephemeral pseudonymous chat messaging over Nostr. Bridged with Bitchat geohash channels.

No more "anonymous" imagery on #Nymchat. Now just leaning into the "#" symbol that's used for channels and ascii art "n" letter. The android app on Google Play has already been updated. Just trying to fix an issue with Apple to get the TestFlight build updated. Otherwise, the web version is also updated. This change makes the app look a bit more polished and professional and without any possible stigma around "hacking" or whatever...

Pseudonymously Chat with Nymchat

Ephemeral pseudonymous chat messaging over Nostr. Bridged with Bitchat geohash channels.

new charts who dis

End The Fed... WTF · USD vs Bitcoin

End The Fed... WTF · USD vs Bitcoin

Live charts: US debt, USD debasement, vs. Bitcoin.

I wonder which Hollywood studio they’re filming Artemis II in today

So damn cool… @Max is on White Noise and I am on Nymchat View quoted note →

#Nostr I'm excited to announce an update to the #Nymchat end-to-end encrypted group chats! All new group chats now use @JeffG Marmot Protocol for MLS encrypted group chats. Forward secrecy, post-compromise security, and zero metadata. If for some reason a recipient can't use MLS, it falls back to our original NIP-17 group chat iteration, which is still e2ee.

Pseudonymously Chat with Nymchat

Ephemeral pseudonymous chat messaging over Nostr. Bridged with Bitchat geohash channels.