JP2000068997A - Method for storing encryption key - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the anti-tamper performance by separating an encryption key of a communication device such as a mobile communication terminal from the communication device and storing the key with security. SOLUTION: An encryption key storage module consisting of a memory 1, a terminal 2 and a board 3 is mounted on a ring 4. The memory 1 mounted on the board stores an encryption key of a communication device. At the start of communication, the terminal 2 connects with a terminal of a mobile terminal to install the encryption key from a key storage module to the mobile terminal to conduct encryption communication. Or a coil can be provided in place of the terminal 2 to install the encryption key contactless. At the end of communication, the encryption key on the communication device such as the mobile terminal is erased. An article mounted always on a body such as a ring or a necklace stores the encryption key and the encryption key is installed through contact with the communication device or contactless only at the start of communication, then even when the communication device is stolen, the encryption key cannot be stolen and the ring being a storage medium of the encryption key is not stolen nor missing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an encryption key holding method for a communication terminal, and more particularly to an encryption key holding method for holding an encryption key separately from a communication terminal.

[0002]

2. Description of the Related Art Communication devices, especially mobile communication terminals using wireless communication, require the use of encryption in order to keep the communication secret. In this case, the encryption key is held inside the communication device, and the communication text is transmitted after being encrypted, or the received encryption text is decrypted with the encryption key. If the encryption key is stolen, it will be severely damaged by eavesdropping and decrypting the ciphertext, or sending out a fake ciphertext. If the communication device itself is stolen or lost, the inside may be disassembled, the semiconductor chip or module may be analyzed, and the encryption key may be decrypted.

Conventionally, in order to prevent the encryption key from being stolen, the encryption key of a communication device or a mobile terminal that performs encryption communication is stored in a tamper-resistant semiconductor chip or module, and the encryption key is used. Encryption and decryption. In particular, mobile communication terminals are likely to be stolen or lost, and are required to have tamper resistance.

[0004]

However, there is no key holding method or key holding device having sufficient tamper resistance at present, and if a communication device is stolen, the encryption key is decrypted by some method. Thus, there is a problem that there is no perfect method for preventing theft of the encryption key as long as the encryption key is held inside the communication device.

[0005] It is an object of the present invention to solve the above-mentioned problem and to improve the tamper resistance by separating the encryption key from the communication device and holding it safely.

[0006]

In order to solve the above-mentioned problems, in the present invention, an encryption key holding method is provided in which a communication terminal holds an encryption key for performing encryption and decryption in a personal accessory, and the communication terminal uses the same. When the communication starts, the encryption key held in the accessory is transferred to the communication terminal. With this configuration, the encryption key can be safely held separately from the communication device.

[0007] Further, the encryption communication method is such that an encryption key of a communication terminal is held in a personal accessory, the encryption key held in the personal accessory is transferred to the communication terminal before starting communication in the communication terminal, and a communication text is encrypted with the encryption key. The encrypted text transmitted and received is decrypted with the encryption key, and the encryption key in the communication terminal is deleted after the communication is completed. With this configuration, the security can be improved without storing the encryption key in the communication terminal except during communication.

[0008] Also, a memory for holding an encryption key for encrypting and decrypting the accessory at the communication terminal, a communication terminal for communicating with the communication terminal, and transferring the held encryption key to the communication terminal at the start of communication. Means. With this configuration, it is possible to always wear the storage medium holding the encryption key and manage it so that it is not lost.

Also, a memory for holding an encryption key for encrypting and decrypting the accessory at the communication terminal, a communication unit for communicating with the communication terminal in a non-contact manner, and the held encryption key to the communication terminal at the start of communication. And a transfer means.
With this configuration, the encryption key can be installed only by bringing the accessory closer to the communication terminal.

[0010] Further, the ring includes a memory for holding an encryption key for encrypting and decrypting the ring at the communication terminal, and means for transferring the held encryption key to the communication terminal at the start of communication. With this configuration, the storage medium holding the encryption key can always be put on a finger to prevent theft or loss.

Further, the necklace is configured to include a memory for holding an encryption key for encrypting and decrypting at the communication terminal, and means for transferring the held encryption key to the communication terminal at the start of communication. With this configuration, it is possible to prevent theft or loss by keeping the storage medium holding the encryption key around the neck at all times.

Further, the bracelet is configured to include a memory for holding an encryption key for performing encryption and decryption in the communication terminal, and means for transferring the held encryption key to the communication terminal at the start of communication. With this configuration,
The storage medium holding the encryption key is always attached to the wrist to prevent theft or loss.

That is, according to the present invention, the carrier for holding the encryption key is separated from the communication terminal, the key is stored in a jewelry such as a ring or a necklace which is always worn on the body, and the encryption key is stored in the mobile body only during communication. It is installed on the terminal to perform encrypted communication, and upon completion of communication, the encryption key on the communication terminal is erased.
Therefore, when communication is not performed, the encryption key is not stored in the communication terminal, so that even if the semiconductor chip or module is stolen or lost and analyzed, the key does not exist there. Since the encryption key cannot be decrypted, the security of the encryption key is enhanced.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION
An encryption key holding method for holding an encryption key for performing encryption and decryption in the communication terminal in the accessory, and transferring the encryption key held in the accessory to the communication terminal at the start of communication in the communication terminal. Has the effect of separating the encryption key and installing the encryption key from the accessory at the start of communication.

According to a second aspect of the present invention, an encryption key of a communication terminal is held in an accessory, and the encryption key held in the accessory is transferred to the communication terminal before starting communication in the communication terminal. An encrypted communication method for encrypting a communication message with the encryption key, transmitting the encrypted message, decrypting the received encryption message with the encryption key, and deleting the encryption key in the communication terminal after communication is completed. Is not left in the communication terminal, thereby preventing the encryption key from being stolen.

According to a third aspect of the present invention, there is provided a memory for holding an encryption key for performing encryption and decryption in a communication terminal, a communication terminal for communicating with the communication terminal, and communicating the held encryption key. Means for transferring to the communication terminal at the time of start, always wearing the encryption key,
At the start of communication, an effect is provided that an encryption key can be installed from a personal accessory.

According to a fourth aspect of the present invention, there is provided a memory for holding an encryption key for performing encryption and decryption in a communication terminal, a communication unit for communicating with the communication terminal in a non-contact manner, At the start of communication, and has a function of non-contactly installing an encryption key only by bringing the accessory closer to the communication terminal.

According to a fifth aspect of the present invention, a memory for holding an encryption key for performing encryption and decryption in a communication terminal, and means for transferring the held encryption key to the communication terminal at the start of communication. A ring provided with the function of enabling installation of an encryption key from the ring.

According to a sixth aspect of the present invention, there is provided a memory for holding an encryption key for performing encryption and decryption at a communication terminal, and means for transferring the held encryption key to the communication terminal at the start of communication. The necklace has a function of enabling an encryption key to be installed from the necklace.

According to a seventh aspect of the present invention, there is provided a memory for holding an encryption key for performing encryption and decryption in a communication terminal, and means for transferring the held encryption key to the communication terminal at the start of communication. A bracelet provided with the function of enabling an encryption key to be installed from the bracelet.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described in detail with reference to FIGS.

(First Embodiment) In a first embodiment of the present invention, an encryption key for a communication terminal is held in an encryption key holding module provided on a ring, and the ring is communicated at the start of communication. This is an encryption key holding method in which an encryption key is installed by contacting the terminal, and the encryption key in the communication terminal is deleted after the communication is completed.

FIG. 1 is a diagram of a ring for storing an encryption key according to the first embodiment of the present invention. In FIG. 1, a memory 1 for holding an encryption key is mounted on a substrate 3, and terminals 2 for communicating with the outside are formed on the substrate 3. The combination of the memory 1, the terminal 2, and the substrate 3 is called an encryption key holding module. Such an encryption key holding module is mounted on a ring.

FIG. 2 is a diagram of a mobile communication terminal according to the first embodiment of the present invention. In FIG. 2, a cryptographic operation unit 5 is a means for performing an operation for performing cryptographic communication. The mobile terminal 6 is a communication terminal including the cryptographic operation unit 5. Terminal 7 is a terminal for communicating with the encryption key holding module. FIG. 3 is a diagram illustrating a situation where the encryption key holding module is connected to the mobile terminal 6 and the encryption key is transmitted from the encryption key holding module to the mobile terminal 6.

The encryption key holding method according to the first embodiment of the present invention configured as described above will be described with reference to FIGS.
This will be described with reference to FIG. The encryption key is held in the memory 1 of the encryption key holding module mounted on the ring 4. Before the communication starts, the terminal 2 is brought into contact with the terminal 7 of the mobile terminal 6 and the encryption key is transmitted from the encryption key holding module to the mobile terminal 6. The cryptographic operation unit 5 performs an operation for performing cryptographic communication, encrypts the communication message, and transmits it. Also, it decrypts the received ciphertext. When the communication is completed, the encryption key in the mobile terminal 6 is deleted.

As described above, in the first embodiment of the present invention, the encryption key holding method is such that the encryption key for the communication terminal is held in the encryption key holding module provided on the ring, and when the communication is started. , Touch the ring to the communication terminal to transfer the encryption key,
Since the encryption key in the communication terminal is erased after the communication is completed, there is no encryption key in the communication terminal when communication is not performed, and the encryption key is not decrypted even if the communication terminal is stolen.

(Second Embodiment) In a second embodiment of the present invention, an encryption key for a communication terminal is held in an encryption key holding module provided on a ring, and the ring is communicated at the start of communication. This is an encryption key holding method in which an encryption key is installed in a contactless manner close to a terminal, and the encryption key in the communication terminal is erased after communication is completed.

FIG. 4 is a diagram of a ring for storing an encryption key according to the second embodiment of the present invention. Holds the encryption key,
FIG. 3 is a diagram in which an encryption key holding module that transmits an encryption key by communicating with a mobile terminal in a non-contact manner is provided on a ring 11. In FIG. 4, a memory 8 is a storage device for holding an encryption key. The coil 9 is a means for communicating with the outside in a non-contact manner. A memory 8 and a coil 9 are formed on a substrate 10. The combination of the memory 8, the coil 9, and the substrate 10 is called a non-contact encryption key holding module.

FIG. 5 is a diagram of a mobile communication terminal according to the second embodiment of the present invention. The cryptographic operation unit 12 is means for performing an operation for performing cryptographic communication. Mobile terminal
Reference numeral 13 denotes a communication terminal including the cryptographic operation unit 12. Antenna 14
Is means for communicating with the encryption holding module in a non-contact manner. FIG. 6 is a diagram showing a situation where the contactless encryption key holding module is placed near the mobile terminal 6 and the encryption key is transmitted from the contactless encryption key holding module to the mobile terminal 6 in a contactless manner. is there.

FIGS. 4 to 6 show the encryption key holding method according to the second embodiment of the present invention configured as described above.
This will be described with reference to FIG. The encryption key is stored in the memory 8 of the non-contact type encryption key storage module provided on the ring 11 in advance. Before starting communication, the coil 9 of the encryption key holding module of the ring 11 is brought close to the antenna 14 of the mobile terminal 13 to communicate with the mobile terminal 13 in a non-contact manner to transmit the encryption key. The cryptographic operation unit 12 encrypts the message using the encryption key and transmits the message. The received cipher text is decrypted by the cryptographic operation unit 12 using the encryption key. When the communication is completed, the encryption key in the mobile terminal 6 is deleted.

As described above, in the second embodiment of the present invention, the encryption key holding method is such that the encryption key for the communication terminal is held in the encryption key holding module provided on the ring, and when the communication is started. The encryption key is transferred without contact by bringing the ring close to the communication terminal, and the encryption key in the communication terminal is erased after the communication is completed. Therefore, the encryption key can be installed just by bringing the ring close to the communication terminal, and no communication is performed Sometimes there is no encryption key in the communication terminal, and even if the communication terminal is stolen, the encryption key is not decrypted, and the security is enhanced.

(Third Embodiment) In a third embodiment of the present invention, an encryption key for a communication terminal is held in an encryption key holding module provided on a necklace or a bracelet.
This is an encryption key holding method in which an encryption key is installed in a communication terminal in a contact or non-contact manner at the start of communication, and the encryption key in the communication terminal is deleted after the communication is completed.

FIG. 7 is a diagram of a necklace for storing an encryption key according to the third embodiment of the present invention. This is an example in which the ring 4 of the first embodiment shown in FIG. 1 is replaced with a necklace, and holds an encryption key as in the case of FIG. FIG.
As shown in (1), before the communication starts, the contact terminal is brought into contact with the terminal of the mobile terminal, and the encryption key is transmitted from the encryption key holding module to the mobile terminal. Further, by making the contact terminal of the encryption key holding module provided in the necklace shown in FIG. 7 a coil like the non-contact type encryption key holding module of the second embodiment shown in FIG. By bringing the coil of the module close to the antenna of the mobile terminal, the encryption key can be transmitted by contacting the mobile terminal without contact.

FIG. 9 is a view of a bracelet storing an encryption key according to the third embodiment of the present invention. This is an example in which the ring 4 of the first embodiment shown in FIG. 1 is replaced with a bracelet, and holds an encryption key as in the case of FIG.
As shown in FIG. 10, the encryption key is transmitted to the mobile terminal 6. Further, by making the contact terminal of the encryption key holding module provided on the bracelet shown in FIG. 9 a coil like the non-contact type encryption key holding module of the second embodiment shown in FIG. By bringing the coil of the module close to the antenna of the mobile terminal, the encryption key can be transmitted by contacting the mobile terminal in a non-contact manner.

As described above, in the third embodiment of the present invention, the encryption key holding method is performed by holding an encryption key for a communication terminal in an encryption key holding module provided on a necklace or a bracelet. The encryption key is transferred to the communication terminal at the start and the encryption key in the communication terminal is erased after the communication is completed, so the encryption key can be installed from the necklace or bracelet on the communication terminal. If there is no key and the communication terminal is stolen, the encryption key will not be decrypted, thus increasing security.

[0036]

As is apparent from the above description, according to the present invention, an encryption key holding method is provided in which a communication terminal holds an encryption key for performing encryption and decryption in a personal accessory and starts communication when the communication terminal starts communication. Since the encryption key held in the accessory is configured to be transferred to the communication terminal, the encryption key is separated into the accessory and the encryption key is not decrypted even if the communication terminal is stolen or lost. This has the effect of maintaining security.

Further, the encryption communication method is such that the encryption key of the communication terminal is held in the accessory, the encryption key held in the accessory is transferred to the communication terminal before the communication in the communication terminal starts, and the communication text is encrypted by the encryption key. It is configured to transmit the encrypted text, decrypt the received ciphertext with the encryption key, and erase the encryption key in the communication terminal after the communication is completed. Even if the terminal is stolen or lost, the encryption key is not decrypted and the effect of maintaining security is obtained.

Further, a memory for holding an encryption key for encrypting and decrypting the accessory at the communication terminal, a communication terminal for communicating with the communication terminal, and transferring the held encryption key to the communication terminal at the start of communication. And the means
The effect that the security is maintained can be obtained by always wearing the carrier for holding the encryption key.

Further, a memory for holding an encryption key for encrypting and decrypting the accessory at the communication terminal, a communication unit for communicating with the communication terminal in a non-contact manner, and the held encryption key to the communication terminal at the start of communication. With the configuration including the transfer means, an effect is obtained that the encryption key can be installed only by bringing the accessory closer to the communication terminal.

Further, a memory is provided for holding an encryption key for encrypting and decrypting a ring, necklace or bracelet at a communication terminal, and means for transferring the held encryption key to the communication terminal at the start of communication. Therefore, since the encryption key is always held by the person who is wearing it, there is no danger of being stolen or lost, and the effect of maintaining security can be obtained.

[Brief description of the drawings]

FIG. 1 is a view of a ring mounted with an encryption key holding module according to a first embodiment of the present invention;

FIG. 2 is a diagram of a mobile terminal having an encryption key transmission terminal according to the first embodiment of the present invention;

FIG. 3 is a diagram illustrating a state in which a ring is attached to a mobile terminal and an encryption key is transmitted according to the first embodiment of the present invention;

FIG. 4 is a diagram of a non-contact key holding ring according to a second embodiment of the present invention;

FIG. 5 is a diagram of a mobile terminal having an encryption key transmission antenna unit according to a second embodiment of the present invention;

FIG. 6 is a diagram showing a state in which an encryption key is transmitted by bringing a ring close to a mobile terminal according to the second embodiment of the present invention;

FIG. 7 is a diagram of an encryption key holding necklace according to a third embodiment of the present invention;

FIG. 8 is a diagram showing a state in which the necklace according to the third embodiment of the present invention is attached to a mobile terminal and an encryption key is transmitted;

FIG. 9 is a diagram of an encryption key holding bracelet according to a third embodiment of the present invention;

FIG. 10 is a diagram illustrating a state in which a bracelet according to a third embodiment of the present invention is attached to a mobile terminal and an encryption key is transmitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Encryption key holding module 2 Encryption key transmission terminal 3 Substrate 4 Ring 5 Encryption module 6 Mobile terminal (including encryption operation unit) 7 Encryption key transmission terminal 8 Encryption key holding module 9 Coil 10 Substrate 11 Ring 12 Encryption module 13 Mobile terminal (including cryptographic operation unit) 14 Antenna unit for transmitting encryption key 15 Necklace 16 Bracelet

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J104 AA16 EA09 EA16 NA02 NA37 PA01 5K067 AA32 BB04 EE02 EE35 EE39 HH21 HH23

Claims (7)

[Claims] 1. An encryption key holding method comprising: holding an encryption key for performing encryption and decryption in a communication terminal in an accessory; and transferring the encryption key held in the accessory to the communication terminal at the start of communication. . 2. An encryption key of a communication terminal is held in an accessory, and before starting communication in the communication terminal, the encryption key held in the accessory is transferred to the communication terminal, and a communication text is encrypted by the encryption key. And decrypting the received encrypted text with the encryption key, and deleting the encryption key in the communication terminal after the communication is completed. 3. A memory for holding an encryption key for performing encryption and decryption in a communication terminal, a communication terminal for communicating with the communication terminal, and means for transferring the held encryption key to the communication terminal at the start of communication. Accessories. 4. A memory for holding an encryption key for performing encryption and decryption in a communication terminal, a communication unit for communicating with the communication terminal in a non-contact manner, and transferring the held encryption key to the communication terminal at the start of communication. Accessories. 5. A ring comprising: a memory for holding an encryption key for performing encryption and decryption in a communication terminal; and means for transferring the held encryption key to the communication terminal at the start of communication. 6. A necklace comprising: a memory for holding an encryption key for performing encryption and decryption in a communication terminal; and means for transferring the held encryption key to the communication terminal at the start of communication. 7. A bracelet comprising: a memory for holding an encryption key for performing encryption and decryption in a communication terminal; and means for transferring the held encryption key to the communication terminal at the start of communication.