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TLS Client Hello Mirror

This service presents your browser's TLS Client Hello message in multiple formats. It can be used directly or in CI tests to check for TLS privacy pitfalls (session resumption, fingerprinting, system time exposure) and security shortcomings (deprecated TLS versions, weak cipher suites, missing features, etc).

Details here

API endpoints

json/v1 - basic

json/v2 - detailed

API Documentation

Connection

TLS version: TLS 1.3
Cipher suite: TLS_AES_128_GCM_SHA256
TLS session resumed: true

TLS session resumption marginally speeds up the initiation of connections, but it affects privacy in much the same way that HTTP cookies do: the server provides a unique token that your browser sends back on subsequent connections, allowing the server to link your visits even if your IP address changes. The browser can mitigate this by enforcing a short TLS session lifetime: the paper linked below suggests a limit of 10 minutes or less.

Tracking Users across the Web via TLS Session Resumption

Supported features

Signed certificate timestamps: false
OCSP stapling: true

Supported TLS/SSL versions

TLS 1.3
TLS 1.2

Cipher suites

TLS_AES_256_GCM_SHA384

TLS_CHACHA20_POLY1305_SHA256

TLS_AES_128_GCM_SHA256

TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384

TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384

TLS_DHE_RSA_WITH_AES_256_GCM_SHA384

TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256

TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256

TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256

TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

TLS_DHE_RSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 (not recommended)

TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (not recommended)

TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (not recommended)

TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 (not recommended)

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (not recommended)

TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 (not recommended)

TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA (not recommended)

TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (not recommended)

TLS_DHE_RSA_WITH_AES_256_CBC_SHA (not recommended)

TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA (not recommended)

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (not recommended)

TLS_DHE_RSA_WITH_AES_128_CBC_SHA (not recommended)

TLS_RSA_WITH_AES_256_GCM_SHA384 (not recommended)

TLS_RSA_WITH_AES_128_GCM_SHA256 (not recommended)

TLS_RSA_WITH_AES_256_CBC_SHA256 (not recommended)

TLS_RSA_WITH_AES_128_CBC_SHA256 (not recommended)

TLS_RSA_WITH_AES_256_CBC_SHA (not recommended)

TLS_RSA_WITH_AES_128_CBC_SHA (not recommended)

TLS_EMPTY_RENEGOTIATION_INFO_SCSV

Extensions

server_name
ec_point_formats
supported_groups
session_ticket
status_request
encrypt_then_mac
extended_master_secret
signature_algorithms
supported_versions
psk_key_exchange_modes
key_share
pre_shared_key

Supported groups

x25519
secp256r1
x448
secp521r1
secp384r1
ffdhe2048
ffdhe3072
ffdhe4096
ffdhe6144
ffdhe8192

Signature algorithms

ecdsa_secp256r1_sha256
ecdsa_secp384r1_sha384
ecdsa_secp521r1_sha512
ed25519
ed448
rsa_pss_pss_sha256
rsa_pss_pss_sha384
rsa_pss_pss_sha512
rsa_pss_rsae_sha256
rsa_pss_rsae_sha384
rsa_pss_rsae_sha512
rsa_pkcs1_sha256
rsa_pkcs1_sha384
rsa_pkcs1_sha512
sha224,ecdsa (not recommended)
sha224,rsa (not recommended)
sha224,dsa (not recommended)
sha256,dsa (not recommended)
sha384,dsa (not recommended)
sha512,dsa (not recommended)

TLS fingerprint

JA3: 771,4866-4867-4865-49196-49200-159-52393-52392-52394-49195-49199-158-49188-49192-107-49187-49191-103-49162-49172-57-49161-49171-51-157-156-61-60-53-47-255,0-11-10-35-5-22-23-13-43-45-51-41,29-23-30-25-24-256-257-258-259-260,0-1-2
JA3 MD5: 0c59de52d152f2593e57ef3a1db4fc2a

NJA3v1: 769,771,4866-4867-4865-49196-49200-159-52393-52392-52394-49195-49199-158-49188-49192-107-49187-49191-103-49162-49172-57-49161-49171-51-157-156-61-60-53-47-255,5-10-11-13-22-23-43-45-51,29-23-30-25-24-256-257-258-259-260,0-1-2,772-771,1027-1283-1539-2055-2056-2057-2058-2059-2052-2053-2054-1025-1281-1537-771-769-770-1026-1282-1538,1,
NJA3v1 SHA256/128: 3092a6e371c68a45b63b9fbe6636ade2

Parameters in the Client Hello message differ between clients, enabling servers and on-path observers to detect what browser you are likely using (down to its version, or a range of versions) by deriving its fingerprint from said parameters. Worse, if you change any TLS-related settings, your TLS fingerprint becomes specific to a much smaller group of users, possibly even to you alone.

JA3 is a simple and popular type of TLS fingerprint. NJA3 is a similar style of fingerprint which aims to improve the robustness and accuracy of JA3.

TLS Fingerprinting with JA3 and JA3S

NJA3 documentation

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Author: nervuri

Source (contributions welcome)

License: BSD-3-Clause