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Public-key cryptography
She then sends the box to Bob through regular mail. Instead, both keys are generated secretly, as an interrelated pair. At this point, if the message has been unaltered during transmission, the message will be clear to the receiver. A block cipher enciphers input in blocks of plaintext as opposed to individual characters, the input form used by a stream cipher. For security reasons, this approach has considerable difficulties — if nothing else, some users could be forgetful, inattentive, or confused. When Bob receives the box with only his padlock on it, Bob can then unlock the box with his key and read the message from Alice.

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Public-key cryptography, or asymmetric cryptography, is any cryptographic system that uses pairs of keys: public keys which may be disseminated widely, and private keys which are known only to the owner. This accomplishes two functions: authentication, where the public key verifies that a holder of the paired private key sent the message, and encryption, where only the paired private key. Before the modern era, cryptography focused on message confidentiality (i.e., encryption)—conversion of messages from a comprehensible form into an incomprehensible one and back again at the other end, rendering it unreadable by interceptors or eavesdroppers without secret knowledge (namely the key needed for .