This site creates a paired 'padlock' and 'key' to conceal your internet data from prying eyes
If you are sending confidential personal information via email you really should use an email encryption system like PGP.
Unfortunately many people don't use it, and if you need to get someone to e-mail you some information and they don't use encryption, then what do you do?
Simple - create your personal Epadlock and key, email them the padlock and keep the key. They use the padlock file to 'encrypt' the data and send the resulting code to you. You use your 'key' file to decrypt the code so you can read the original data.
Click above to get an Epadlock
If you want to find out more about how it works...