dig out secrets beneath AirSig

My sister installed AirSig last week. She is so exciting about this new techknology and she won't stop writing strange words in the air. She want me to take a guess about what she wrote in the air...Of course I could not know what she wrote. Even I write exaclty what she wrote in the air, AirSig will only authenicate her motion...That is fantastic..But... I told her not to use AirSig because secrets still could be found somewhere in the filesystem.

Guess what? She does not believe what I said to her. I have to prove it so I take a look at her phone. It's ridiculous...everything inside AirSig is plaintext only...I don't have to worry about decryption on it.

You guys could see the Facebook info as below. I show this screenshot to my sister...She is so scared and she swear she won't save any credentials in AirSig any more...