Author: str4d.xyz (did:plc:bvdrfwiamgi5leqs63q2duro)
Collections
Record🤔
cid:
"bafyreid7ypy4v24ch4avkwuhvdtnbit4e2zmiczyj5fp2kqjj546ag4r7i"
value:
text:
"Signal is deploying ristretto255 as part of their usernames feature! 🔐 They appear to be using a Pedersen hash over the ristretto255 group, along with a Sigma/Schnorr Proof-of-Knowledge of its correctness, to hide usernames from the Signal servers."
$type:
"app.bsky.feed.post"
embed:
$type:
"app.bsky.embed.recordWithMedia"
media:
$type:
"app.bsky.embed.images"
images:
alt:
"Screenshot from the quoted article: "To avoid storing even those usernames, Signal is also using a cryptographic function called a Ristretto hash, which allows it to instead store a list of unique strings of characters that encode those handles.""
image:
View blob content
$type:
"blob"
mimeType:
"image/jpeg"
size:
213809
aspectRatio:
width:
671
height:
211
alt:
"Screenshot of the libsignal source code, showing how the username proof is created."
image:
View blob content
$type:
"blob"
mimeType:
"image/jpeg"
size:
452582
aspectRatio:
width:
1258
height:
594
alt:
"Screenshot of the libsignal source code, showing how the Pedersen hash of the username is constructed, and the corresponding inputs are prepared for the proof."
image:
View blob content
$type:
"blob"
mimeType:
"image/jpeg"
size:
345701
aspectRatio:
width:
905
height:
896
record:
$type:
"app.bsky.embed.record"
record:
cid:
"bafyreid3ioa4n3c6taxljaqdwcbjdoj4ryxqkssvyzqxyhcgviztsw72hq"
langs:
"en"
createdAt:
"2024-02-20T18:32:35.575Z"
