JPS62155642A - Data transmission controller - Google Patents

Abstract

PURPOSE:To select the presence/absence of ciphering and a ciphering system in matching with the chipering function of an opposite party by realizing a ciphering/decoding function and a transmission control function incorporatedly so as to reduce the memory access for the ciphering/decoding. CONSTITUTION:The information required for a protocol control section 1 accesses a memory section 2 via a DMA control section 3. The information is transmitted/received between the DMA control section 3 and the control section 1 via a signal path 31. Then the data of layer (n) subjected to protocol processing having a layer (n) or below and sent to the line 11 at the control section 1 is read by the DMA control section 3 and the memory section 2, then subjected to ciphering processing by a ciphering section 4 and the result is given to the control section 1. Conversely, the reception data from the line 11 is subjected to the protocol processing by the control section 1, decoded by the ciphering section 4 and written in the memory section 2. It is possible to transmit/receive the data to the line 11 without ciphering and to use the signal line 31 without through the ciphering section 4, and the control section 1 decides the use/diuse of the ciphering section in matching with the function of the opposite side at the connection with the opposite party. Moreover, the control section 1 controls the ciphering system of the ciphering section 4 in matching with the ciphering function of the opposite party at the call setting of the layer (n).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transmission control device, and particularly to a data transmission control device for transmitting and receiving encrypted data.

(Prior technology) Conventionally, data transmission control functions were configured independently, and were integrated with layered communication protocol control to perform encryption. There was nothing there.

(Problems to be Solved by the Invention) As mentioned above, in the conventional configuration, encryption/decryption processing and data transmission control processing were performed separately.

For this reason, there is a drawback that the data memory must be accessed separately for each of the encryption process and the data transmission control process. Also, since it is carried out separately, when communicating with the other party via a switched network,
This method has the drawback that it is difficult to control whether or not to use encryption or change the encryption method depending on the transmission control device of the communication partner.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a data transmission control device that eliminates the above-mentioned drawbacks and can set whether or not to perform an encryption operation when setting up a layer n call.

Another object of the present invention is to provide a data transmission control device that is capable of selecting an encryption method when setting up a layer n call.

[Means for solving problems]

The data transmission control device of the present invention has an encryption section inside the device, and has a function of encrypting/decoding simultaneously when handling transmitted and received data for data transmission, and a function to enable or disable the encryption section. It has functions such as controlling invalidation and changing the encryption method. Specifically, the data transmission control device of the modified invention is a data transmission control device that performs communication according to a layered communication protocol, and includes a protocol control unit that executes protocols at layer n and below, and data on layer n that is stored. a memory section, a DMA control section for reading or writing data transmitted and received in the memory section, and encryption for encrypting or decoding layer n data exchanged between the DMA control section and the protocol control section; It consists of a part.

[Example] Next, an example of the present invention will be described with reference to the drawings.

The drawing is a block diagram of a data transmission control device according to an embodiment of the present invention. Reference numeral 1 denotes a protocol control unit that executes a protocol at layer n or below, and is directly connected to the other party's data transmission control device or to a switching network via a line 11. Reference numeral 2 denotes a memory section in which data to be transmitted (layer n data) is stored by the protocol control section 1.

A DMA control section 3 controls the exchange of information between the memory section 2 and the protocol control section 1.

4 is an encryption unit that performs encryption or decryption. 5 is a processing unit that executes protocol control of layer n+1 or higher and a system-specific application program.

The memory section 2 also serves as a program memory for the processing section 5. 31 is a signal path that directly connects the DMA control section and the protocol control section. Further, 14 is a control line for controlling the encryption method of the encryption unit 4 from the protocol control unit 1.

The information that the protocol control unit 1 needs for its own operation is D.
The memory section 2 is accessed via the MA control section 3. This information is DMA controlled via signal path 31? 11S3 and the protocol control unit 1.

On the other hand, layer n data that is processed by the protocol control unit 1 for layers n and below and sent to the line 11 is D
After being read out from the memory section 2 by the M A 1IIJ controller 3, it is sent to the encryption section 3, where it is encrypted and then passed to the protocol control section 1.

On the other hand, it is received from line 11 and the protocol control unit controls layer n.
The layer n data that has been subjected to the following protocol processing is sent to the encryption unit 4, and after being decrypted, the DMA
! Write to memory unit 2 by IJ 1iI11 unit 3.

It is possible to send and receive data to the line without encrypting it by using the signal path 31 without going through the encryption section 4.
When connecting with the other party, the protocol control unit 1
When setting up a call, the use/non-use of the encryption section is determined according to the functions of the receiver side. In history, the protocol 1 to the control unit 1 is layer n.
When setting up a call, the encryption method is determined by negotiating with the processor side, and the dark YJ encryption method of the encryption unit 4 can be controlled via the control line 14.

〔Effect of the invention〕

The present invention has the effect of reducing memory access for encryption/decryption by integrating a data transmission control function and an encryption/decryption function. Further, there is an effect that whether or not encryption is to be performed and the encryption method can be selected under control within the data transmission control device according to the encryption function of the other party.

[Brief explanation of drawings]

The drawing is a block diagram of a data transmission 171J controller according to an embodiment of the present invention. 1...Protocol control section, 2...Memory section, 3...
・DMA control unit, 4...encryption unit, 5...processing unit,
11... Line, 14... Control line, 31... Signal path.

Claims (1)

[Claims] A data transmission control device that performs communication according to a layered communication protocol includes a protocol control unit that executes a protocol at layer n and below, a memory unit in which layer n data is stored, and a memory unit that reads or receives transmitted and received data from the memory unit. A data transmission control device comprising: a DMA control section for writing; and an encryption section for encrypting or decoding layer n data exchanged between the DMA control section and the protocol control section. .