ENCRYPTING DEVICE

摘要

A random-number sequence is generated in advance by a data concealing functi on f8 that generates a random-number sequence and is stored in a random-number sequence storing unit (buffer). When data (message) is input, a random-numbe r sequence stored in the random-number sequence storing unit is retrieved and the data (message) is encrypted in an EXCLUSIVE-OR circuit to prepare an encrypted text. When decoding data, a random-number sequence is generated by the data concealing function f8 for storing in the random-number sequence storing unit (buffer). When an encrypted text is input, a random-number sequence is read from the random-number sequence storing unit (buffer) in th e EXCLUSIVE-OR circuit for decrypting to data (message).