| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a mobile encryption / decryption apparatus capable of carrying out encryption / decryption processing with much more enhanced security by increasing the immunity against attacks to known plain texts and selected plain texts. <P>SOLUTION: The mobile encryption / decryption apparatus (2) having a block encryption processing function is provided with an XML data processing means (3) that interprets marking by the XML to segment an encryption / decryption object block from a data the part of a received electronic text, extracts part of secret information and the part of encryption / decryption object data by each block, and uses the secret information to carry out the encryption / decryption processing for the extracted encryption / decryption object data. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
