JPS6020660A - System for randamizing coded information - Google Patents

Abstract

PURPOSE:To attain randamizing of coded information by which decoding is more difficult by inserting an ROM storing a table for plural kinds of information coding to a transmitter and a receiver and changing the table at the same time at each prescribed time. CONSTITUTION:A CPU1 for transmission and a CPU6 for reception are provided with clock counters 5, 10 in synchronizing with the identical ROMs 2, 7 for coding information respectively. The CPU1 for transmission reads an instruction by using the conrol ROM3, selects one of plural tables stored in the information code ROM2 selected by the CPU1 by means of a clock counter for the information to be transmitted, codes the information corresponding to the content and transmits the result from a transmission section 4 to the receiver. The information fetched by the reception section 9 is decoded by the table in the ROM7 selected by a counter 5 in synchronizing with the counter 5 of the transmission section. Since the ROM7 has the identical content to that of the ROM2 at the transmission section, the data is decoded correctly.

Description

[Detailed Description of the Invention] Technical Field> The present invention relates to a system for transmitting information between a party and a party using a transmitter/receiver, and particularly relates to a system for transmitting information between parties.
The present invention relates to a randomization method for encoded information that uses an OM unit to prevent transmitted information from being decoded by a third party.

<Background of the Invention> In recent years, in the field of transmission, there have been an increasing number of cases in which confidentiality is considered important when transmitting and receiving certain information between parties. Therefore, when transmitting information using a transmitter/receiver between Party A and Party B, the applicant first decided to use the same information encoding ROM unit among multiple information encoding ROM units to prevent the contents from being decoded by a third party. We proposed a randomization method for encoded information that allows parties involved to arbitrarily set the irregularity of the code by inserting it into a transmitter/receiver in advance.

However, since the ROM unit used in this method is equipped with a single information encoding table, it is necessary to decide in advance which ROM unit to exchange and when between the sender and the receiver.

Therefore, this method has a problem in that incorrect information is transmitted due to an error in selecting a ROM unit or a shift in replacement timing.

Purpose of the present invention The present invention has been made in view of the above problems, and its purpose is to use ROM units with the same configuration as a transmitter/receiver among ROM units having multiple types of information encoding tables. By simultaneously changing the tables of both ROM units at predetermined intervals, it is possible to eliminate the problem of incorrect information being transmitted due to incorrect selection of the ROM unit or lag in replacement timing, and to improve decoding. The object of the present invention is to provide a method for randomizing encoded information, which is difficult to perform.

<Example> Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of the transmitter/receiver section, and FIG. 2 is a memory map of the information encoding ROM unit shown in FIG.

In FIG. 1, 1 is a CPU of a transmitting section, and 2 is an information encoding ROM unit, which can be easily removed. 3 is a control ROM in which CPUI instructions are written, 4 is a C
The part that transmits the code from the PUI by wire or wirelessly,
5 is a clock counter.

6 is the CPU of the receiving section, and 7 is the same information encoding ROM as 2.
The unit can be easily removed.

8 is a control ROM in which instructions for the CPU 5 are written; 9
9 is a part that receives the code sent from the transmitter 4 and sends it to the CPU 5, and 9 is a clock counter that is synchronized with the clock counter 5 on the transmitting side.

The information encoding ROM units 2 and 7 have the same configuration, and in particular, as shown in FIG. 2, they are provided with a plurality of types of information encoding tables, and by changing the tables, the same information can be converted into different codes. It is made up like this.

Now, the transmission CPUI reads the command from the control ROM 3 and sends the information to be transmitted to the CPU from the clock counter 5.
The information is encoded in accordance with the contents of the table 1 of the information encoding ROM unit 2 selected by the PUI, and the code is transmitted from the transmitter 4 to the receiver by wireless or wire.

The receiving section 9 captures the transmitted code, and the captured code is sent to the receiving CPU 6, where the information corresponding to the code is read out from the information encoding ROM unit 7 and the code is decoded. In this case, the table 1 of the ROM unit 7 is designated by the clock counter 10 as the same table 1 as that of the ROM unit 2 on the transmitting side, and therefore the decoded data is the same as the data intended to be sent from the transmitting side. Here, since the tables of the ROM units 2 and 7 on the transmitting and receiving sides are simultaneously changed at predetermined time intervals by the clock counters 5 and 10 that cycle with each other, the selection and replacement timing of the ROM units to be used are determined by each party. This becomes unnecessary and the table changes automatically, making it even more difficult to decipher the sign -5.

<Effects> As described above, according to the method for randomizing encoded information according to the present invention, the R
Of the OM units, the same one is inserted into the transmitter/receiver, and the tables of both ROM units are changed at the same time at predetermined intervals, so there is no chance of mistakes in ROM unit selection or timing of replacement. This can prevent the transmission of incorrect information due to mistakes, and makes it even more difficult to decipher the information.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a transmitting/receiving section in the present invention, and FIG. 2 is a memory map of the information encoding ROM of the present invention shown in FIG. 1 is a transmitting CPU, 2 and 7 are information code/other ROM units, 3 and 8 are CPU control ROMs, 4 is a transmitter, 5
and 10 are clock counters, 6 is a receiving CPU, and 9 is a receiving section.

Claims (1)

[Claims] 1. In a system in which information is transmitted between A and B using a transceiver, ROM units having the same configuration among a plurality of types of information encoding tables are used as the transceiver. 1. A method for randomizing encoded information, characterized in that code irregularity can be arbitrarily set by simultaneously changing tables of both ROMs and nodes at predetermined time intervals.