/b/ - Usernames in Signal

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Usernames in Signal Jānis 08/30/2022 (Tue) 21:07:09 No. 860

Real IP

>Our new method is faster and more efficient. It lays the groundwork for the introduction of usernames and phone number privacy which will offer new privacy controls around your phone number’s visibility on Signal. >Signal uses enclaves for contact discovery. Enclaves isolate data and its processing from everything else going on in a given server, obfuscating it even from server owners/administrators. This means that neither Signal nor the people who run the servers we rely on have access to or knowledge about what’s happening in an enclave. Our use of enclaves allows users to connect via their contacts while preventing Signal’s server owners from extracting the contact lists. >Encrypted RAM is a start, but it doesn’t do the full job. Simply knowing how memory is accessed can be enough to leak information. So, when we use enclaves, we build additional protections to defend against information leakage. We use “oblivious RAM” algorithms which work to obscure memory patterns and obfuscate data in enclaves. >Path ORAM has allowed us to speed up our processing for contact discovery. >In order to support phone number privacy, we need to expand the contact discovery database. Therefore, we will have more data to search for every query. The bigger the dataset, the faster we have to search in order to keep the user experience smooth. >Right now, the implementation of Path ORAM is the backbone for a new era of contact discovery in Signal, one that will let users choose usernames that they could opt to share with people instead of their phone numbers. Usernames have been one of the most requested features throughout Signal’s existence. Making usernames and phone number privacy a reality in Signal is a massive technical undertaking. It’s something we’ve been working on for a long time and will continue to work on for several more months or longer before it’s ready. Implementing Path ORAM for contact discovery is one step on that road, and we’re happy to share this inside look at the foundation we’re laying. I hope these cunts don't keep the phone number requirement, this is all trust based after all, and it would be convenient given certain CIA connections. TL;DR They improved the encryption/obfuscation algorithms speed enough to support a larger database, which they would have to deal with for usernames. https://signal.org/blog/building-faster-oram/

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