| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that it is difficult to cut out the blocks from a cryptogram since block lengths are unfixed, and that repetition hardly appears in the cryptogram even though repetition exists in the plain text since a random number is added to each block. SOLUTION: A plain text is transmitted by making it into plural lengths of blocks using a secret block key, putting random numbers at prescribed positions of the blocks, and then ciphering them, and the cryptograph is deciphered by dividing it into blocks using a common block key, and eliminating the random numbers from the blocks so as to obtain the plain text on a receiver side.
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