Bypass reCAPTCHA v2 Enteprise OR Reproduce Android APK TLS Fingerprints (JA3) for Authentication Flow
Budget: €18 – €36 EUR
I have an authentication flow used in an Android APK. When running the flow via the official app, no CAPTCHA is triggered. However, when replicating the same requests with Python (e.g., using requests, httpx, tls_client or curl_cffi), a reCAPTCHA v2 challenge appears.
I am looking for an experienced developer who can:
1. Implement an unlimited reCAPTCHA v2 Enterprise solving method without using paid captcha solving services.
For example, by reverse-engineering or emulating the expected interactions (e.g., using the same fingerprinting/behavior as the app).
Or via open-source captcha solvers or innovative approaches that do not rely on external paid APIs.
OR
2. Reconstruct or spoof the TLS/JA3 fingerprint (or any other relevant fingerprinting/signatures) of the official Android APK.
This may involve:
- Capturing the actual TLS ClientHello parameters (ciphers, extensions, etc.) via mitmproxy, Wireshark, or Frida.
- Reproducing them in Python or another scripting language so the server perceives the same client.
- Emulating HTTP/2 and any custom headers if needed.
Requirements:
Proven experience with:
- TLS fingerprinting (JA3, JA3S, etc.) and fingerprint spoofing.
- Android traffic analysis and reverse engineering.
- Recaptcha v2 solving techniques (without paid services).
- Python or any other relevant HTTP clients supporting low-level TLS customization.
- Ability to demonstrate a working proof of concept.
- Clear documentation of your approach.
Deliverables:
A script or tool that:
- Authenticates successfully without triggering CAPTCHA or solving it without paid APIs.
- Mimics the APK’s TLS and behavioral fingerprint.
- Instructions for setup and usage.
Notes:
I will provide:
- The APK name.
- Sample requests and responses.
- Observed differences between the APK and Python requests.
Budget:
Please propose your estimated budget and timeline.
How to apply:
- Briefly explain your experience with similar tasks.
- Mention any past work related to TLS fingerprinting or CAPTCHA bypass.
I am looking for an experienced developer who can:
1. Implement an unlimited reCAPTCHA v2 Enterprise solving method without using paid captcha solving services.
For example, by reverse-engineering or emulating the expected interactions (e.g., using the same fingerprinting/behavior as the app).
Or via open-source captcha solvers or innovative approaches that do not rely on external paid APIs.
OR
2. Reconstruct or spoof the TLS/JA3 fingerprint (or any other relevant fingerprinting/signatures) of the official Android APK.
This may involve:
- Capturing the actual TLS ClientHello parameters (ciphers, extensions, etc.) via mitmproxy, Wireshark, or Frida.
- Reproducing them in Python or another scripting language so the server perceives the same client.
- Emulating HTTP/2 and any custom headers if needed.
Requirements:
Proven experience with:
- TLS fingerprinting (JA3, JA3S, etc.) and fingerprint spoofing.
- Android traffic analysis and reverse engineering.
- Recaptcha v2 solving techniques (without paid services).
- Python or any other relevant HTTP clients supporting low-level TLS customization.
- Ability to demonstrate a working proof of concept.
- Clear documentation of your approach.
Deliverables:
A script or tool that:
- Authenticates successfully without triggering CAPTCHA or solving it without paid APIs.
- Mimics the APK’s TLS and behavioral fingerprint.
- Instructions for setup and usage.
Notes:
I will provide:
- The APK name.
- Sample requests and responses.
- Observed differences between the APK and Python requests.
Budget:
Please propose your estimated budget and timeline.
How to apply:
- Briefly explain your experience with similar tasks.
- Mention any past work related to TLS fingerprinting or CAPTCHA bypass.