Type in a message and press "send", our server will generate a GUID based on uuidgenerator.net, a random 8 character passphrase based on passwordwolf.com (Which is not stored in our database), and will encrypt your message using AES-256-CBC. You'll then receive a link that contains the GUID and the passphrase to view the message (or to send to someone to view the message), as soon as the link is used the message will no longer exist in our database.
You now have the option for our service to send you an email when your message is read by the recipient. When you supply your email, we encrypt it before inserting it into our database using the same encryption method as your secret message, including the same passphrase. This passphrase is not stored in our server, it is given as part of the link to view the message.
Since everything sent to our server is encrypted with AES-256-CBC, and the passphrase only exists in the link provided, that means only you and whoever you send the link to can view the message. If anyone else wanted to view it, they've got to brute-force it. Fifty supercomputers that could check a billion billion (1018) AES keys per second (if such a device could ever be made) would, in theory, require about 3×1051 years to exhaust the 256-bit key space. We've done our best to make these messages not viewable by anyone but the person with the link, even if that person has database access, but we make no guarantees and are not responsible for any damage caused by using this service.