摘要 |
PROBLEM TO BE SOLVED: To provide an ATM controller with high reliability and high-speed performance by preventing leakage of security of data so as to enhance the security of the data. SOLUTION: Upon receipt of an encryption instruction of transmission data from a control section 2, an encryption processing means 4 receives encryption data from an encryption storage means 9 to encrypt data of a 1st transmission reception data storage means 3 and to store the data to a 2nd transmission reception data storage means 5. When an ATM interface control section 6 receives the encryption instruction from the control section 2, the control section 6 sets an encryption complete flag to a PTI section in a header part of an ATM cell and transmits the resulting cell to an ATM interface via a 3rd transmission reception data storage means 7 and a driver/receiver 8.
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