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cryptools

Useful crypto tools for CTF

Why?

This is a fork of the currently unmaintained cryptools from sonickun.

This was forked in the hopes of having a quick and easy-to-use python library for common crypto attacks and implementations usually found in CTF challenges. This fork hopes to continue the work that was started by sonickun while adding improvements and proper documentation.

Tech

Prime-factorize methods

  • Small division
  • Miller-Rabin test
  • Pollard's rho algorithm
  • Fermat method

RSA

Implementation

  • Encrypt/Decrypt
  • Multi-prime RSA
  • Chinese remainder theorem
  • Generating random prime numbers

Attacks

  • Low public exponent attack
  • Common modulus attack
  • Wiener's attack
  • Hastad's broadcast attack
  • Franklin-Reiter related message attack
  • Chosen ciphertext attack

Elliptic Curve

TODO.

Installation

Requirements

  • PyCrypto
  • GmPy
$ pip install -r requirements.txt

Install

$ git clone https://github.com/Otach/cryptools.git
$ python setup.py install

Usage

$ python
>>> from cryptools import *

There are the sample codes. <- TODO

License

MIT

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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