| 摘要 |
PROBLEM TO BE SOLVED: To provide an encrypting method and a decrypting method and their equipment which enable powerful encrypting/decrypting operation wherein an ordinary sentence is not correspondent to a cipher one to one and the conventional cryptology cannot be applied by introducing error correcting encoding. SOLUTION: Error correcting encoding processing is performed to the ordinary sentence with error correcting encoding processing equipment 11. Bit errors are generated at random with random bit error generating equipment 13, to the error correcting encoded data, in a range of correction capability of error correcting code. The data in which bit errors are generated are encrypted with encrypting processing equipment 15, and the cipher is formed. The cipher is decrypted with decrypting processing equipment 21. The decrypted sentence is subjected to error correcting encoding processing with error correcting encoding processing equipment, thereby recovering the ordinary sentence.
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