CryptographyBy: Panos Louridas Series: The MIT Press Essential Knowledge series A broad introduction to cryptographywhat it is, how it really works, what its future holds, and why every informed citizen should understand its basics. We all keep secretsfrom our gym locker codes to our email passwords to our online interactions. And we choose to share those secrets only with those whom we trust. So, too, do organizations, businesses, governments, and armies. In