====== Security ======

===== Google =====

Quick links in case you need to verify things:

  * [[https://myaccount.google.com/security?pli=1|Security Home]]
  * [[https://security.google.com/settings/security/permissions|Connected Apps]]
  * [[https://security.google.com/settings/security/apppasswords|One time app passwords]]

===== General Security =====

[[http://www.shamusyoung.com/twentysidedtale/?p=11523|Shamus attempts to explain hashing]] then [[http://codahale.com/how-to-safely-store-a-password/|Use bcrypt to store passwords]]. 

Consider [[http://code.google.com/p/py-bcrypt/|py-bcrypt]] at code.google.  No documentation there, yet. [[http://www.mindrot.org/projects/py-bcrypt/|Old documentation]].

At the bottom of this page, is the compiler used to make Python 2.6 and 2.7 [[http://www.microsoft.com/visualstudio/en-us/products/2010-editions/express#Visual_Studio_2008_Express_Downloads|Visual Studio 2008 Express]].

On Windows, you'll have to make the following change:
<code>
$ diff bcrypt_python.c.org bcrypt_python.c
70a71,72
>       char *password_copy;
>       char *salt_copy;
76,77c78,79
<       char *password_copy = strdup(password);
<       char *salt_copy = strdup(salt);
---
>       password_copy = strdup(password);
>       salt_copy = strdup(salt);
</code>

Then you can build it with setup, like so:

<code>
c:\Python27\python.exe setup.py build
</code>

<code>
import bcrypt

# Hash a password for the first time, with a randomly-generated salt
hashed = bcrypt.hashpw(password, bcrypt.gensalt())

# gensalt's log_rounds parameter determines the complexity.
# The work factor is 2**log_rounds, and the default is 12
hashed = bcrypt.hashpw(password, bcrypt.gensalt(10))

# Check that an unencrypted password matches one that has
# previously been hashed
if bcrypt.hashpw(password, hashed) == hashed:
    print "It matches"
else:
    print "It does not match"
</code>


Never use passwords whose unsalted MD5 hash can be looked up here: [[http://md5.gromweb.com/]]

[[http://eli.thegreenplace.net/2010/06/25/aes-encryption-of-files-in-python-with-pycrypto/|AES encryption of files in Python with PyCrypto]]. Note that pycrypto-2.3 can be built with the same ''c:\Python27\python.exe setup.py build'' mechanism.

Someone suggested [[wp>Whirlpool_(cryptography)]], it's offered in [[http://labix.org/python-mhash|mhash]], and a pure-python implementation from Bjorn Edstrom <be@bjrn.se> 16 december 2007 is here [[http://www.bjrn.se/code/whirlpoolpy.txt]].

==== Verification ====

Maybe I should try to automate a way to verify the SHA1 Checksums of PGP signatures and upon success, verify the PHP signatures.  Here's an old recipe: [[http://dannyman.toldme.com/2007/03/30/howto-verify-pgp-signature/|HOWTO: Verify a PGP Signature]].

**Keywords**: crypt, cryptography pgp sha