Sony Corporation

Shinji Nanba

Akikazu Takeuchi

Toru Mineyama

An application program that was encrypted by using a predetermined secret key is input to an input section that is a part of a program execution system, and encrypted sentences as the encrypted application program are supplied to a decoding section as they are. The decoding section is supplied not only with the encrypted sentences from the input section but also with a publicized key corresponding to a secret key that was used in generating the encrypted sentences. The decoding section decodes the encrypted sentences by using the publicized key and supplies Java byte codes as a decoding result to a Java virtual machine. The Java virtual machine interprets and executes the Java byte codes that are supplied from the decoding section.

Information processing apparatus and method and recording medium

In an information processing apparatus and method, an application program that was encrypted using secret key-A is supplied to a decoding section , and publicized key-B and an encrypted publicized key-A (corresponding to secret key-A) that was encrypted by using secret key-B corresponding to publicized key-B are supplied to a decoding section . The decoding section decodes the encrypted publicized key-A by using publicized key-B and supplies a resulting publicized key-A to the decoding section . The decoding section decodes the encrypted application program by using publicized key that is supplied from the decoding section and supplies Java byte codes as a decoding result to a Java virtual machine . The Java virtual machine interprets and executes the Java byte codes that are supplied from the decoding section . As a result, it becomes possible to allow only programs developed by a legitimate software developer to be executed in certain program execution environments.

A build object of build class Builder has build method build (Object resolved) for building reference relations among construction-element objects by calling a field setting method owned by construction-element object resolved. A get object of class Getter has get method get object ( ) for acquiring a construction-element object and is also allowed to own a build object. In the get object, construction-element object resolved is acquired by calling get method get object ( ). In a build object owned by the get object, construction-element object resolved acquired by the get object is initialized by build method build (Object resolved). By adopting the procedure described above, construction-element objects required for constructing desired software such as an application program can be collected for constructing the desired software.

Information processing apparatus, method, and recording medium for recording a computer program to be executed by a computer to carry out processing of constructing software

A method of executing a branch instruction of jumping to a subroutine in a pipeline control system. The pipeline control system, which utilizes a data bus for instruction read operation and also for data read/write operation, performs at least one stage between an instruction fetching stage and an instruction executing stage. A branch instruction is fetched with a branch address fed through an address bus. The content of a first program counter is temporarily saved in a second program counter. The content of the first program counter is then updated with a new branch address. Following this, the content of the second program counter is saved in a computer memory for use as a return address.

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Kanagawa, Japan

Shinji Nanba