| 摘要 |
For information encryption and decryption the apparatus uses the same hardware keys, which have the transition matrix of a key-automaton with no output signal and with an initial state and a final state burnt in. To each character in the character set of the plaintext message there is one or more final states of the key-automaton assigned. During encryption the message is read in sequentially character by character and the key automaton assigns to each character a random character string, whose length is adjustable length within a given length range. The process is the following: for each character in the message the apparatus generates a character string of adjustable length and with no initial- and end markers, which takes the apparatus from its current state into the final state that corresponds to the subsequent character of the message. The apparatus creates the encrypted message by linking these character strings together. The encrypted message can be decrypted using the same apparatus.
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