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Data transmission system

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专利汇可以提供Data transmission system专利检索,专利查询,专利分析的服务。并且PURPOSE: To send information with high safety by dividing a plain message into some blocks and adding a dummy data to a data of a block and ciphering the result.
CONSTITUTION: A message inputted to an input means 10 is divided into a block whose length is (LN-2) bytes, where LN bytes are the length of an open public key (n). Then a padding means 12 adds a padding data in 2-bytes to a head of each of divided blocks to obtain a data whose one block length is LN bytes. After the end of padding, a data for each block is ciphered by a cipher processing means 13 based on an RSA cryptography. When a final block is ciphered, all data after processing is sent to a communication opposite party by an output means 14. On the other hand, a party receiving the ciphered data by an input means 20 uses a division means 21 to divide the input data into blocks of the same length as that of the open public key (n). Then the data of each block is decoded by a cipher processing means 22 based on the RSA cryptography.
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