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(energetic music) - Hi. My name is Mia Gil Epner. Im majoring in Computer Science at UC Berkeley and I work for the Department of Defense where I try to keep information safe. The internet is an open and public system. We all send and receive information over shared wires and connections. Even though its an open system, we still exchange a lot of private data, things like credit card numbers, bank information, passwords, and emails. So how is all this private stuff kept secret? Data of any kind can be kept secret through a process known as encryption, descrambling or changing of the message to hide the original text. Now, decryption is the process of unscrambling that message to make it readable. This is a simple idea, and people have been doing it for centuries. One of the first well-known methods of encryption was Caesars cipher, named after Julius Caesar, a Roman general who encrypted his military commands to make sure that if a message was intercepted by enemies, they wouldnt