Abstract: Embodiments of the present invention relate to secure deployment of software applications on transaction terminals using keys and certificates. In one embodiment, a method for electronically certifying an application for installation at a transaction terminal is accomplished at a terminal key management server by receiving an application along with a request to certify the application, comparing the application to one or more terminal constraints, issuing a certificate that corresponds to the application, digitally signing the certificate, and making the digitally signed certificate and the encrypted application available to the transaction terminal.

Abstract: Embodiments of the present invention relate to secure deployment of software applications on transaction terminals using keys and certificates. In one embodiment, a method for electronically certifying an application for installation at a transaction terminal is accomplished at a terminal key management server by receiving an application along with a request to certify the application, comparing the application to one or more terminal constraints, issuing a certificate that corresponds to the application, digitally signing the certificate, and making the digitally signed certificate and the encrypted application available to the transaction terminal.

Abstract: A method of executing a stack-based program using a processor having a register-based architecture, the processor having means for simulating a stack using a subset of its registers such that the processor may operate in a simulated stack-based mode as well as a register-based mode. The method comprises the steps of fetching stack-based instructions from a program memory, translating individual stack-based instructions or sequences of stack-based instructions into register-based instructions, and including in at least certain of the translated instructions an indication that these instructions are to be executed using the simulated stack-based mode. Translated instructions, including said indication, are executed using the simulated stack-based mode, and other translated instructions are executed using the register-based mode.