METHOD AND APPARATUS OF ENCRYPTION/DECRYPTION FOR PROVIDING SEAMLESS CIPHER COMMUNICATION

The present invention relates to a key input method and an operation method for seamless cipher communication and, more specifically, an encryption and decryption method for seamless cipher communication which receives a second encryption key while performing encrypted communication through a first encryption key, stores encryption key input information about the first encryption key and the second encryption key in a static area, copies the stored encryption key input information in a dynamic area, selects one encryption key from the first encryption key and the second encryption key based on the copied encryption key input information and current time information, generates encryption key location information and encryption key selection information about the selected encryption key, transmits information of the selected encryption key and an encrypted message so that a different encryption apparatus connected to an encryption apparatus through a network obtains the encryption key to decrypt the encrypted message, and performs the seamless encryption communication. [Reference numerals] (AA) Start;(BB) End;(S201) Perform encrypted communication through a first encryption key;(S202) Input a second encryption key;(S203) Store the encryption keys in a static area;(S204) Copy the encryption key input information in a dynamic area;(S205) Select an encryption key;(S206) Create selection information;(S207) Transmit the information to another encryption device