JP2018078610A5

JP2018078610A5 -

Info

Publication number: JP2018078610A5
Application number: JP2017240706A
Authority: JP
Filing date: 2017-12-15
Publication date: 2018-06-28
Anticipated expiration: 2034-03-06

Description

上記目的を達成するために、本発明の暗号化／復号化システムは、ホスト装置との間でデータを送受信する暗号化／復号化システムであって、前記ホスト装置との間で送受信されるデータに対して暗号化処理又は復号化処理を行うためのプログラムを暗号化した状態で格納する格納手段と、前記格納されたプログラムを復号化するための鍵を前記暗号化／復号化システムの状態に応じて生成する鍵生成手段と、前記鍵生成手段によって生成された鍵を用いて前記格納されたプログラムを復号化する復号化手段と、前記復号化されたプログラムを実行する実行手段とを備えることを特徴とする。 In order to achieve the above object, an encryption / decryption system of the present invention is an encryption / decryption system that transmits / receives data to / from a host device, and that transmits / receives data to / from the host device. Storage means for storing a program for performing encryption processing or decryption processing in an encrypted state, and a key for decrypting the stored program in the state of the encryption / decryption system A key generation unit configured to generate a response; a decryption unit configured to decrypt the stored program using the key generated by the key generation unit; and an execution unit configured to execute the decrypted program. It is characterized by.

Claims

An encryption / decryption system for transmitting / receiving data to / from a host device,
Storage means for storing in encrypted form a program for performing encryption processing or decryption processing on data transmitted to and received from the host device;
Key generation means for generating a key for decrypting the stored program according to the state of the encryption / decryption system;
Decryption means for decrypting the stored program using the key generated by the key generation means;
An encryption / decryption system comprising: execution means for executing the decrypted program.

A first register configured with at least one register value;
A second register configured with at least one register value;
Selecting at least one first register value from at least one register value constituting the first register and at least one second register value from at least one register value constituting the second register. A selection means to select;
An information value generating means for generating an information value constituted by a combination of the selected first register value and the selected second register value;
The encryption / decryption system according to claim 1, wherein the key generation unit generates the key based on the information value generated by the information value generation unit.

3. The encryption / decryption system according to claim 2, further comprising combining means for combining the information value with another information value.

4. The encryption / decryption system according to claim 3, wherein the other information value is composed of plain text.

3. The information value generating means generates the information value when a first time has elapsed and a second time has elapsed since the encryption / decryption system was activated. 5. The encryption / decryption system according to any one of items 1 to 4.

The key generation means performs arithmetic processing by converting the two information values generated by the information value generation means when the first time has elapsed and when the second time has elapsed into pseudorandom numbers, respectively. 6. The encryption / decryption system according to claim 5, further comprising means.

7. The encryption / decryption system according to claim 6, wherein the arithmetic processing unit performs an exclusive OR operation on the two information values.

The encryption / decryption system has two or more startup methods,
The encryption / decryption system according to any one of claims 2 to 7, wherein the information value becomes a different value depending on a startup method of the encryption / decryption system.

9. The encryption / decryption according to claim 2, wherein at least one of the register value of the first register and the register value of the second register changes according to time. system.

A method for controlling an encryption / decryption system for transmitting / receiving data to / from a host device, comprising: a program for performing encryption processing or decryption processing on data transmitted / received to / from the host device; A storage step for storing in an encrypted state;
Generating a key for decrypting the stored program according to the state of the encryption / decryption system; and
A decryption step of decrypting the stored program using the key generated in the key generation step;
An encryption / decryption system control method comprising: an execution step of executing the decrypted program.

A program for causing a computer to execute a control method of an encryption / decryption system for transmitting / receiving data to / from a host device,
The control method of the encryption / decryption system is:
A storage step of storing an encrypted program for performing an encryption process or a decryption process on data transmitted to and received from the host device;
Generating a key for decrypting the stored program according to the state of the encryption / decryption system; and
A decryption step of decrypting the stored program using the key generated in the key generation step;
An execution step of executing the decrypted program.