Abstract: Various embodiments include composite security interconnect devices and methods. One method embodiment that may be performed by a composite security interconnect device, also referred to herein as a security controller, includes decrypting a first encrypted input received from a peripheral device with a first encryption key to obtain clear text. The first encryption key may be an encryption key established between the security controller and the peripheral device. The method further includes encrypting the clear text with a second encryption key to obtain second encrypted input, the second encryption key being a key of an encryption key pair established with a transaction processing host.

Abstract: Various embodiments herein each include at least one of systems, devices, methods, and software of security devices. One method embodiment includes decrypting first and second data received from first and second peripheral devices, respectively, of a Self-Service Terminal (SST) and verifying the first and second data properly originated from the first and second peripheral devices, respectively. This method may then decrypt third data received from a computer controlling operation of the SST and verifying the third data properly originated with the SST controlling computer. This method may then perform at least one remedial data processing activity when any one of the first, second, and third data are not verified as properly originated. Otherwise, when the first, second, and third data are verified as originating properly, the method includes transmitting the first, second, and third data to a transaction-processing host via a network.

Abstract: Various embodiments include composite security interconnect devices and methods. One method embodiment that may be performed by a composite security interconnect device, also referred to herein as a security controller, includes decrypting a first encrypted input received from a peripheral device with a first encryption key to obtain clear text. The first encryption key may be an encryption key established between the security controller and the peripheral device. The method further includes encrypting the clear text with a second encryption key to obtain second encrypted input, the second encryption key being a key of an encryption key pair established with a transaction processing host.