README.rst

gocept.pseudonymize

This package provides helper functions to pseudonymize data like text, integers, email addresses or license tags.

It uses the crypt.crypt() function for pseudonymization, which means, longer text blocks require multiple crypt.crypt() calls.

Usage

gocept.pseudonymize provides single functions for pseudonymization of various data types. Each function takes the value, which should be pseudonymized, and a secret, which is passed as a salt to the crypt module. If secret and value do not change the pseudonymize function returns the exact same result when called again:

>>> import gocept.pseudonymize
>>> gocept.pseudonymize.text('Here is my little text', 'secret')
'u7YJWz RqdYkfNUFgZii2Y'
>>> gocept.pseudonymize.text('Here is my little text', 'secret')
'u7YJWz RqdYkfNUFgZii2Y'

The result has always the same string length as the input. But there is no guaranty that it is still valid in the domain of the input value. For example the checksum of the pseudonymized IBAN is not correct.

This package is tested to be compatible with Python version 2.7, 3.5 up to 3.8.

Detailed usage examples

There are different pseudonymization function because it is not always possible to guess the correct one by looking at the input data.

• For a name use the name function:

  >>> gocept.pseudonymize.name('Vimladil', 'secret')
  'R5lprkud'
  

• For an address consisting of street and house number use the street function:

  >>> gocept.pseudonymize.street('Testweg 34a', 'secret')
  'Kui1xre 723'
  

• For an integer value use the integer function:

  >>> gocept.pseudonymize.integer(4711, 'secret')
  2111
  

• For a decimal value use the decimal function:

  >>> from decimal import Decimal
  >>> gocept.pseudonymize.decimal(Decimal('-123.45'), 'secret')
  Decimal('-8772.11')
  

• For an email address use the email function:

  >>> gocept.pseudonymize.email('[email protected]', 'secret')
  '[email protected]'
  

• For an IBAN account number use the iban function:

  >>> gocept.pseudonymize.iban('US00123456787650047623', 'secret')
  'DE10312010975100119998'
  

• For a BIC (Business Identifier Code) use the bic function:

  >>> gocept.pseudonymize.bic('PBNKDEFFXXX', 'secret')
  'GTY1BPG8PE2'
  

• For a license tag of a car use the license_tag function:

  >>> gocept.pseudonymize.license_tag('HAL-AB 123', 'secret')
  'PUD-AM 117'
  

• For a phone number use the phone function:

  >>> gocept.pseudonymize.phone('+49 172 34123142', 'secret')
  '0104118118111676'
  

• For a date use the date function:

  >>> from datetime import date
  >>> gocept.pseudonymize.date(date(1983, 1, 11), 'secret')
  datetime.date(3021, 1, 18)
  

• For a date represented as string use the datestring function. It takes a format string and keeps zeros date parts as zero.:

  >>> gocept.pseudonymize.datestring('00/03/2003', 'secret', format='DD/MM/YYYY')
  '00/10/7399'
  

• For a time value use the time function:

  >>> from datetime import time
  >>> gocept.pseudonymize.time(time(23, 59, 59), 'secret')
  datetime.time(13, 11, 49)
  

There are some additional pseudonymizer functions and helper functions in this package.