Abstract: In the encryption key sharing scheme, the eavesdropping of the communication contents by the third person is prevented by automatically updating a shared key which is hard to predict for the third person, by acquiring a seed of the shared key to be used for the encryption of the next communication from the correspondent, without requiring the user to update the shared key at every occasion of the communication with the correspondent.

Abstract: A communications apparatus communicating with a communications destination apparatus using a communications controller includes a communications unit to communicate with the communications destination apparatus, a database to store a control rule according to which the communications controller controls communications between the communications apparatus and the communications destination apparatus, and an informer to inform the communications controller of the control rule stored in the database to register the control rule in the communications controller.

Abstract: A message processing scheme capable of realizing both a portability and a unified way of handling and managing e-mails of a given user is disclosed. The collective message processing and the unified message accesses are realized by storing and managing messages from a plurality of message delivery servers in the message processing device that is unique to the user. All mails destined to the user are collected at the message processing device regardless of a current location of the user, so that the user only needs to view mails on this message processing device.

Abstract: A message processing scheme capable of realizing both a portability and a unified way of handling and managing e-mails of a given user is disclosed. The collective message processing and the unified message accesses are realized by storing and managing messages from a plurality of message delivery servers in the message processing device that is unique to the user. All mails destined to the user are collected at the message processing device regardless of a current location of the user, so that the user only needs to view mails on this message processing device.

Abstract: In the method for sharing encrypted data region among two or more processes on a tamper resistant processor, one process creates the encrypted data region to be shared according to the common key generated as a result of the safe key exchange, and the other process maps that region to its own address space or process space. The address information of the shared encrypted data region and the common key of each process are set in relation in the encrypted attribute register inside the tamper resistant processor, so that it is possible to share the encrypted data region safely.

Abstract: A mobile terminal transmits an extended packet including address-range information and a no-operation designator. After a router receives the extended packet including the no-operation designator, it transfers the received packet by performing normal routing. After a server receives the transferred packet, it transmits a response packet in the form of an extended packet including a destination address which is the transmitter's address of the received packet, the address-range information, and an operation designator. After the router receives the extended packet including the operation designator in an intranet to which the mobile terminal belongs, it transfers the received packet through at least one network interface corresponding to the address range designated by the address-range information. The mobile terminal processes the received packet when its destination address indicates the mobile terminal.

Abstract: In a tamper resistant microprocessor, a processor temporary key in a form of an encryption key of a secret key cryptosystem is generated at every occasion of an initialization of the microprocessor, according to a random number that is generated according to parameters used inside the microprocessor and that is different for different microprocessors. Then, the context is encrypted by using the processor temporary key and saved into the external memory, and recovered from the external memory and decrypted by using the processor temporary key.

Abstract: In a microprocessor that internally has a microprocessor specific secret key, a key management unit is provided to carry out a key registration for reading out from an external memory a distribution key that is obtained in advance by encrypting the instruction key by using a public key corresponding to the secret key, decrypting the distribution key by using the secret key to obtain the instruction key, and registering the instruction key in correspondence to a specific program identifier for identifying the program into a key table, and to notify a completion of the key registration to the processor core asynchronously by interruption when the key registration is completed.

Abstract: In a program distribution system including a source file sending device, an encrypted program distribution device and an execution file receiving device, which are interconnected through a network, the encrypted program distribution device examines the source file received from the source file sending device, and when the source file passes an examination, an execution file of the program is generated from the source file, a public key which is either unique to an execution file receiving device or unique to a processor of the execution file receiving device is received from the execution file receiving device through the network, at least a part of the execution file is encrypted by using the public key, and the execution file is sent to the execution file receiving device.

Abstract: In a microprocessor, a program key for decrypting a program and a data key for encrypting/decrypting data processed by the program are handled as cryptographically inseparable pair inside the microprocessor, so that it becomes possible for the microprocessor to protect processes that actually execute the program, without an intervention of the operating system, and it becomes possible to conceal secret information of the program not only from the other user program but also from the operating system.

Abstract: The present invention relates to a compound represented by Formula [I] wherein represents an aromatic carbo- or heterocyclic ring which may have a substituent; Cy represents a mono-, bi- or tricyclic aliphatic carbocyclic group having 3 to 20 carbon atoms, which may have a substituent; represents a mono- or bicyclic aliphatic nitrogen-containing heterocyclic group having 3 to 14 carbon atoms, which may have a substituent; R1 represents a hydrogen atom, a lower alkenyl group, a lower alkynyl group, a cyclo(lower alkyl) group, an amino group, a lower alkylamino group, a di(lower alkyl)-amino group, a hydroxyl group, a lower alkoxy group, a carboxyl group, a lower alkoxycarbonyl group, a carbamoyl group, a lower alkylcarbamoyl group or a di(lower alkyl)carbamoyl group, or a lower alkyl group which may have a substituent; and R2 represents a hydrogen atom or a lower alkyl group, a salt or ester thereof, a production process for the same, and an analge

Abstract: The present invention relates to a novel polyol obtained by using a specified polyhydric alcohol, polyoxyalkylene polyol, aliphatic amine and/or alkamlamine as a raw material and adding an organic polycarboxylic acid or its anhydride and an alkylene oxide; a polyurethane resin prepared from said novel polyol and an organic polyisocyanate; a rigid polyurethane foam prepared by using a hydrochlorofluorocarbon or hydrofluorocarbon foaming agent which has very low public hazards; and a composite utilizing thereof.The production of rigid polyurethane foam by using the polyol of the invention can be carried out in good operation efficiency and low public hazards. Additionally, properties of the foam thus obtained is equivalent to those of rigid polyurethane foams obtained by using conventional chlorofluorocarbons. Consequently, the rigid polyurethane foam of the invention is very useful for insulation materials and structural insulation materials.

Abstract: The present invention relates to a polyol, polyurethane resin, rigid polyurethane foam, preparation process thereof and a preparation process of a rigid polyurethane foam composite. The polyol comprises an epoxy resin based polyol, which may be combined with a phenol resin based polyol component and/or an aromatic amine based polyol component. The polyurethane resin, foam and composite using the polyol as a raw material has resistance to dissolution in a hydrochlorofluorocarbon and a hydrofluorocarbon which are foaming agents having very low public environmental hazards and can be used as a thermal insulation material or a thermal insulation structure for refrigerators, freezers, insulation panels, ships and vehicles.

Abstract: A polyurethane resin, rigid polyurethane foam and composite thereof prepared by using a polyol comprising a phenol resin base polyol mixed with an aminophenol base polyol or a polyphenylpolyxylylenepolyamine base polyol or a polymethylenepolyphenylpolyamine base polyol.

Abstract: The present invention relates to a novel polyurethane resin, a foam prepared from the resin, a preparation process of the foam, and preparation process of a rigid polyurethane foam composite having a face material. The primary object of the present invention is to provide a rigid polyurethane foam and a rigid polyurethane foam composite fitted with a face material which are prepared by using a hydrochlorofluorocarbon foaming agent having very low public hazards such as ozone layer destruction and green house phenomenon of the earth.The above object can be achieved by using a combination of a polyether polyol initiated from a phenol resin with an alkanolamine or an aliphatic polyhydroxy compound in the production of rigid polyurethane foams.Foams thus obtained have equivalent properties to those of foams obtained by using chlorofluorocarbons (CFC) which are conventional foaming agents.