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).

API endpoints

Connection

• TLS version: TLS 1.3
• Cipher suite: TLS_AES_128_GCM_SHA256
• TLS session resumed: false

If you haven't already, refresh the page to check if your browser supports session resumption.

Supported features

• Signed certificate timestamps: false
• OCSP stapling: true

Supported TLS/SSL versions

• TLS 1.3
• TLS 1.2

Cipher suites

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

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: 771,4866-4867-4865-49196-49195-49200-49199-49188-49187-49192-49191-255,0-11-10-35-5-22-23-13-43-45-51,29-23-30-25-24-256-257-258-259-260,0-1-2
• JA3 MD5: 02d7359ba777278df8619c1fd64f71e1

• NJA3v1: 769,771,4866-4867-4865-49196-49195-49200-49199-49188-49187-49192-49191-255,5-10-11-13-22-23-43-45-51,29-23-30-25-24-256-257-258-259-260,0-1-2,772-771,1027-1283-1539-2055-2056-2057-2058-2059-2052-2053-2054-1025-1281-1537-771-769-770-1026-1282-1538,1,
• NJA3v1 SHA256/128: 8e6445b480cefdaff537c12814c2fb82

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.

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