A METHOD AND APPARATUS FOR ENCRYPTING AND DECRYPTING DATA

摘要

A method of encrypting data which comprises dividing the data into packets, encrypting the packet using a modified key which is a modification of the key used for encrypting the previous packet, and adding information on the modified key used for encrypting a packet to the encrypted packet in dependence upon the key used for encrypting a previous packet. When decrypting the encrypted data, the information on the modified key is extracted from the encrypted packet in dependence upon the key used for decrypting the previous packet and the extracted key is used for decrypting the encrypted data packets.