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Fast and flexible cryptographic protocol analyzer

Project description

What is it and what is it not?

As the project name CryptoLyzer implies, it is a cryptographic protocol analyzer. The main purpose of creating this application is the fact, that cryptography protocol analysis differs in many aspect from establishing a connection using a cryptographic protocol. Analysis is mostly testing where we trigger special and corner cases of the protocol and we also trying to establish connection with hardly supported, experimental, obsoleted or even deprecated mechanisms or algorithms which are may or may not supported by the latest or any version of an implementation of the cryptographic protocol.

As follows, it is neither a comprehensive nor a secure client/server implementation of any cryptographic protocol. On the one hand analyzer implements only the absolutely necessary parts of the protocol to interact with servers. On the other it may use completely insecure algorithms and mechanisms. It is not designed and contraindicated to use these client/server implementations establishing secure connections. If you are searching for proper cryptographic protocol implementations, there are several existing wrappers and native implementations for Python (eg: M2Crypto, pyOpenSSL, Paramiko, …).

Quick start

CryptoLyzer can be installed directly via pip

pip install cryptolyzer
cryptolyze tls ciphers

or via APT on Debian based systems

apt update && apt install -y gnupg2 curl
echo 'deb /' >/etc/apt/sources.list.d/cryptolyzer.list
curl -s | apt-key add -
apt update && apt install -y python3-pkg-resources python3-cryptoparser python3-cryptolyzer
cryptolyze tls ciphers

or via DNF on Fedora based systems

dnf install 'dnf-command(config-manager)'
dnf config-manager --add-repo
rpm --import
dnf install python3-urllib3 python3-cryptography cryptoparser cryptolyzer

or can be used via Docker

docker run --rm coroner/cryptolyzer tls ciphers
docker run -ti --rm -p coroner/cryptolyzer ja3 generate
openssl s_client -connect

Development environment

If you want to setup a development environment, you are in need of pipenv.

$ git clone
$ cd cryptolyzer
$ pipenv install --dev
$ pipenv run python develop
$ pipenv shell
$ cryptolyze -h

Generic Features




Supported analyzers by cryptographic protocol versions

2.0 3.0 1.0 1.1 1.2
Cipher Suites (ciphers)
X.509 Public Keys (pubkeys)
Elliptic Curves (curves) n/a n/a
Diffie-Hellman parameters (dhparams) n/a n/a
Signature Algorithms (sigalgos) n/a n/a n/a

Python implementation

  • CPython (2.7, >=3.3)
  • PyPy (2.7, 3.5)

Operating systems

  • Linux
  • macOS
  • Windows

Protocol Specific Features

Transport Layer Security (TLS)

Only features that cannot be or difficultly implemented by the most popular SSL/TLS implementations (eg: GnuTls, LibreSSL, OpenSSL, wolfSSL, …) are listed.

Cipher Suites

  1. supports each cipher suites discussed on


  1. generates JA3 tag of any connecting TLS client independently from its type (graphical/cli, browser/email client/…)
  2. decodes existing JA3 tags by showing human-readable format of the TLS parameters represented by the tag

Social Media


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The code is available under the terms of Mozilla Public License Version 2.0 (MPL 2.0).

A non-comprehensive, but straightforward description of MPL 2 can be found at Choose an open source license website.

Download files

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Files for cryptolyzer, version 0.3.0
Filename, size File type Python version Upload date Hashes
Filename, size cryptolyzer-0.3.0.tar.gz (43.1 kB) File type Source Python version None Upload date Hashes View

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