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Cryptonice collects data on a given domain and performs a series of tests to check TLS configuration and supporting protocols such as HTTP2 and DNS. It makes heavy use of open source code and libraries, including the SSLyze library for TLS testing, JARM code for TLS fingerprinting and Wappalyzer code for server components checks.

Cryptonice is currently supported under Python 3.8 and later on the following platforms:

  • Windows
  • Mac OS
  • Ubuntu 20.04
  • CentOS 8 (other Linux distros coming soon).


A Linux compatible Docker container is also now available for those that prefer not to rely on installations of Python or any dependencies. With Docker already installed, first pull down the image:

docker pull f5labs/cryptonice

To run from the container, use the following command:

docker run --rm -it f5labs/cryptonice

If you want to output the JSON results to a folder on your local machine you must tell Docker to map a local path to a path within the container. The following example maps a folder in C:\Scratch to a new folder called /results within the container)::

docker run --rm -it --volume //c/scratch:/results f5labs/cryptonice --json_out --json_path /results

Once the scan is complete you should find the resulting file in your C:\Scratch folder.

For detailed and up to date documentation, check out our ReadTheDocs pages:


The easiest way to get started is by using PIP to install Cryptonice:

pip install cryptonice


User Guide

cryptonice requires a domain name (such as


Providing only a domain name and no other command line input will result in the following default dictionary of commands being run.

    "id": "default",
    "port": 443,
    "scans": ["TLS", "HTTP", "HTTP2", "DNS", "JARM"],
    "tls_params": ["certificate_information", "ssl_2_0_cipher_suites", "ssl_3_0_cipher_suites","tls_1_0_cipher_suites", "tls_1_1_cipher_suites", "tls_1_2_cipher_suites","tls_1_3_cipher_suites", "http_headers"],
    "http_body": false,
    "force_redirect": true,
    "print_out": true,
    "generate_json": true,
    "targets": [""]

The user can also choose to specify custom commands. Each custom command must be preceded with the name of the option (ex: to specify the scans TLS and HTTP to run, the user must add --scans TLS HTTP to the command line parameters)

  • --PORT: port to perform the scan on (default = 443)
  • --SCANS: scans to perform
    • TLS scan, HTTP headers, HTTP2 check, DNS data
  • --TLS_PARAMETERS: TLS specific scans to perform (should be listed as specified below, with no commas between options):
    • all, no_vuln_tests, certificate_info, ssl_2_0_cipher_suites, ssl_3_0_cipher_suites, tls_1_0_cipher_suites, tls_1_1_cipher_suites, tls_1_2_cipher_suites, tls_1_3_cipher_suites, tls_compression, tls_1_3_early_data, openssl_ccs_injection, heartbleed, robot, tls_fallback_scsv, session_renegotiation, session_resumption, session_resumption_rate, http_headers
    • all results in all commands being run, no_vuln_tests results in certificate_info, http_headers and the cipher_suites commands being run.
    • More information on each of these scan options can be found at:
  • --HTTP_BODY: Y/y or N/n - sets a Boolean variable to include or exclude HTTP pages information
  • --FORCE_REDIRECTS: Y/y or N/n - sets a Boolean variable to check for automatic redirects from port 80 to 443 in a TLS scan (default = Y)
  • --PRINT_OUT: Y/y or N/n - sets a Boolean variable to print scan results to console (default = Y)
  • --JSON_OUT: Y/y or N/n - sets a Boolean variable to print scan results to JSON output file (default = Y)



cryptonice generates a JSON output file with the information requested by the input parameters. Output files will be named after the domain name and port provided (ex: target =, port = 443, output =

Utilizing the library in your own code

cryptonice can be used within other projects as well. An example of this functionality can be found in the simple file. In that short script, the program input is a JSON file (sample_scan.json also provided) with the required commands. The data is read into a dictionary and sent to the scanner_driver function in cryptonice/scanner. Individual modules can also be called from outside functions, and will return a dictionary of the results. Further information on function parameters can be found in the code comments for each function.


This code does not currently have the capability to scan a server based on an IP address and an SNI. Instead, the user must supply a hostname and internally the code will do a DNS resolution. This may lead to discrepancies in the IP address scanned in the TLS portions and the HTTP headers section. Certain domain names may also result in only one certificate being returned. The issue currently persists in the sslyze API where we get the certificate information, and we are working to find a solution.

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