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martinthomson /
Last active August 9, 2022 02:17
Poking at the Topics Classifier

Poking at the Topics Classifier

I just spent some time poking at the Topics classifier (available at chrome://topics-internals/; Model version: 2206021246).

With the complete list of 349 topics in topics.txt (source), I generated some names based on the topic strings. This just takes the last component of the topic, and hyphenates it, as follows:

sed -e 's/&/ and /g;s/  */-/g;s/[,()]//g;s/.*[ \/]-*\([-a-zA-Z]*\)$/\' topics.txt
martinthomson / md.reg
Created August 5, 2022 06:54
Enable text/markdown media type for .md files in Windows
View md.reg
Windows Registry Editor Version 5.00
"Content Type"="text/markdown"
View 7983bis.svg
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martinthomson / README
Created December 8, 2021 05:59
Test vector script for QUICv2
Run this with an argument of the version number (in hex).
This is a copy of what I used for QUICv1.
martinthomson /
Last active March 17, 2021 05:14
Proposed charter for OHTTP working group

Oblivious HTTP Working Group (OHTTP) Charter

In a number of different settings, interactions between clients and servers involve information that could be sensitive when associated with client identity.

Client-server protocols like HTTP reveal aspects of client identity to servers through these interactions, especially source addresses. Even without client identity, a server might be able to build a profile of client activity by correlating requests from the same client over time.

View draft-ietf-quic-http.diff
diff --git a/draft-ietf-quic-http.txt b/draft-ietf-quic-http.mnot.txt
index 922b3770..fdd6cf0e 100644
--- a/draft-ietf-quic-http.txt
+++ b/draft-ietf-quic-http.mnot.txt
@@ -1032,23 +1032,23 @@ Table of Contents
response is important. The server SHOULD send PUSH_PROMISE frames
prior to sending HEADERS or DATA frames that reference the promised
responses. This reduces the chance that a client requests a resource
that will be pushed by the server.
View this-is-where-this-ends.xml
<dsig:Transform id="selective"
<!-- The 'presence' element -->
martinthomson /
Last active June 13, 2021 07:43
QUIC Key Schedule

The TLS key schedule looks like this:

TLS Key Schedule

QUIC effectively exports the various traffic secrets, so I had assumed that its use of the different base label in HKDF-Expand-Label() would be limited to those uses that were after that export. I forgot key update when writing this up, but that was fixed in #1899.

QUIC Key Schedule

However, in looking at what people implemented, it appears that the base label they use was used for the entirety of the TLS key schedule.

martinthomson / pn_test.go
Last active August 2, 2018 06:36
Test of different packet number recovery options
View pn_test.go
package minq_test
import "testing"
func recoverMinq(expected uint64, pn uint64, size int) uint64 {
// Mask off the top of the expected sequence number
mask := uint64(1)
mask = (mask << (uint8(size) * 8)) - 1
expectedLow := mask & expected
high := ^mask & expected
martinthomson / example.js
Last active December 24, 2018 07:03
minimal node.js implementation for QUIC test vector
View example.js
var buffer = require('buffer');
var crypto = require('crypto');
var assert = require('assert');
var INITIAL_SECRET = Buffer.from('ef4fb0abb47470c41befcf8031334fae485e09a0', 'hex');
var SHA256 = 'sha256';
var AES_GCM = 'aes-128-gcm';
var AES_ECB = 'aes-128-ecb';
function log(m, k) {