simple-crypt 0.2.0

Simple, secure encryption and decryption for Python 3

What Does Simple Crypt Do?

Simple Crypt encrypts and decrypts data. It has two functions, encrypt and decrypt:

from simplecrypt import encrypt, decrypt
ciphertext = encrypt('password', plaintext)
plaintext = decrypt('password', ciphertext)

That’s it. You can see the implementation on github.

Why Should I Use Simple Crypt?

• It uses standard, well-known algorithms, closely following the recommendations here.

• The established, efficient pycrypto library provides the algorithm implementations (the cipher used is AES256).

• It includes a check (an HMAC with SHA256) to warn when ciphertext data are modified.

• It tries to make things as secure as possible when poor quality passwords are used (PBKDF2 with SHA256, a 128 bit salt, and 10,000 rounds). But that doesn’t mean you should use a poor password!

• Using a library, rather than writing your own code, means that we have less solutions to the same problem. That means more chance of finding bugs, which means more reliable, more secure code.

• If simple-crypt does have a bug, the use of a header in the ciphertext data will help support an upgrade path (I can’t promise full backwards support, because any solution will depend on the attack, but at least the needed information is present).

What Else Should I Know?

• You must also install pycrypto.

• The outputs from encrypt and decrypt are bytes. If you started with string input then you can convert the output from decrypt using .decode('utf8').

mystring = decrypt('password', ciphertext).decode('utf8')

• (c) 2012 Andrew Cooke, [e-mail]; released into the public domain for any use, but with absolutely no warranty.