# salesforce/ja3

JA3 is a standard for creating SSL client fingerprints in an easy to produce and shareable way.

Repository: https://github.com/salesforce/ja3
Canonical: https://ross.abutalabs.com/products/ja3
Language: Python
License: BSD-3-Clause
License Family: permissive
Archived: true
Last push: 2025-05-01T17:30:05+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 19, release rhythm 35, longevity 100
- inputs: {"age_days": 3368, "days_push": 489, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3103, forks 313 (observed 2026-08-28T04:07:43.630347+00:00)

## What it is
JA3 is a standard and set of scripts (Python and Zeek) for generating SSL/TLS client fingerprints that are easy to produce and share for threat intelligence. The project is no longer actively maintained by Salesforce, with successor work continuing as JA4 at FoxIO.

## Use cases
- fingerprint tls clients from network traffic
- detect malware by ssl handshake fingerprint
- share tls fingerprints for threat intelligence
- profile ssl clients in zeek
- generate ja3 hashes from pcaps

## When to choose
- you need the original JA3 fingerprinting standard for compatibility with existing tools
- you want Zeek or Python scripts for TLS client fingerprinting

## When to avoid
- you need actively maintained TLS fingerprinting - use JA4 instead
- you need JA3S or newer fingerprint methods with ongoing support

## Facets
- artifact type: library
- maturity: maintenance
- function: security, networking, monitoring
- domain: security, networking, developer-tools
- platform: python, cross-platform
- tags: tls-fingerprinting, ja3, threat-intelligence, zeek, network-security, linux

## Member repositories
- salesforce/ja3 (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:43.630347+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:46:19.668521+00:00, confidence not recorded.
  - readme: https://github.com/salesforce/ja3 (fetched 2026-08-28T04:07:43.630347+00:00, sha 0f6a2d5b9b00)
- Data as of 2026-08-30T08:39:29.467469+00:00.