Apparatus and method for encrypting and decrypting

Abstract

An encryption/decryption device connected to a communications entity includes: a key storage unit configured to store predetermined keys; a processing unit configured to receive a first key among the predetermined keys from the key storage unit and to encrypt data based on the received first key; a data port unit configured to receive data to be encrypted from the communications entity, to transfer the received data to the processing unit, if the data transferred to the processing unit is encrypted by the processing unit based on the first key, to receive the encrypted data from the processing unit, and to transfer the encrypted data received from the processing unit to the communications entity; and a connection unit configured to physically connect the encryption/decryption device with another encryption/decryption device. The predetermined keys are generated when the connection unit is connected to a connection unit included in the another encryption/decryption device.

Dependencies are inferred from the claim text.