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MISTYPOGRAPHY

This module implements different typo correction strategies discussed in https://www.cs.cornell.edu/~rahul/papers/pwtypos.pdf. For more details please refer to the project page https://www.cs.cornell.edu/~rahul/projects/pwtypos.html.

REQUIREMENTS

  • Install pwmodel from here
$ pip install git+https://github.com/rchatterjee/pwmodels.git

This should install all the dependencies, if not, you may have to install python-Levenshtein.

$ pip install python-Levenshtein

INSTALL

$ pip install git+https://github.com/rchatterjee/mistypography.git

HOW TO USE?

To allow online typo correction, a set of corrected version of the mistyped password is created, and then each of them is tested against the real password hash. This code only generates the possible set of corrections (a.k.a. ball). The simplest way to do this is to use one of the built-in checkers (BUILT_IN_CHECKERS) in typofixer/checker.py file. Descriptions of these checkers is given in the checker.py file.

You can also instantiate your own Checker. To instanticate a checker we need two arguments, first, a set of correctors which you can see the names given in common.py, and second, a policy number which will tune the checker to use one of the given policies (ChkAll, ChkBl etc.).

Note, the checker needs the data directory to be in the same folder. You can move the data directory and change path DATA_DIR_PATH in common.py accordingly.

$ python
Python 2.7.6 (default, Jun 22 2015, 17:58:13) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from typofixer.checker import BUILT_IN_CHECKERS

>>> chk = BUILT_IN_CHECKERS['ChkAllTop3']

>>> chk = BUILT_IN_CHECKERS['ChkAllTop3'] 

>>> chk.check('password')
set(['passwor', 'Password', 'PASSWORD', 'password'])

>>> chk_bl = BUILT_IN_CHECKERS['ChkBlTop3']

>>> chk_bl.check('password')
set(['passwor', 'password'])

>>> >>> chk_all = BUILT_IN_CHECKERS['ChkAllTop5']

>>> chk_all.check('password1')
set(['assword1', 'PASSWORD1', 'Password1', 'password!', 'password', 'password1'])

CONTACT

Rahul Chatterjee (rahul@cs.cornell.edu)

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Fixing annoying password typos during login

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