[andyeskridge]

I don't know for sure, but my assumption is that she is 'Alice'[0] which is a common name used when explaining cryptography

[0] https://en.wikipedia.org/wiki/Alice_and_Bob

[felideon]

And apparently Alice looks like Pebbles (Flinstones)! A key in her hair sounds like a good place to keep. Visible yet on her person at all times.

[zapu]

Looks more like Little Mu from Moomins to me :)

http://capello.nu/wp-content/uploads/lilla-my.jpg