| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve security of an encrypted document and convenience of document output without cost rise. <P>SOLUTION: A computer 1 generates a disposable encryption key 6A on the basis of a previously stored sharing key 4A and generated randomized character strings 5, encrypts a document into an encrypted document using the disposable encryption key 6A, transmits the encrypted document to a cellular phone 2, and transmits the randomized character strings 5 to the cellular phone 2. The cellular phone 2 transmits the received encrypted document to a printer 3. The printer 3 receives the encrypted document. The cellular phone 2 generates a disposable encryption key 6B on the basis of a previously stored sharing key 4B and the received randomized character strings 5, and decrypts the encrypted document received using the disposable encryption key 6B into a document and outputs the decrypted document. The cellular phone 2 transmits the disposable encryption key 6B to the printer 3. The printer 3 decrypts the encrypted document into a document using the received disposable encryption key 6B and outputs the decrypted document. <P>COPYRIGHT: (C)2007,JPO&INPIT |
