An effective symmetric key recovery scheme for secure onboard satellite applications
Reconfigurable FPGAs promise high density, performance
and good schedulable options with their wide range of SRAM
target devices that can be hosted for any applications. The SRAM
FPGAs are widely used due to their vast resources and ease to
design, but critically suffers due to radiation errors called single
event upsets (SEU). These errors are prominent when the FPGA
device is employed beyond an altitude. Therefore, it is very
essential to prevent or to correct the SEUs, particularly for
applications in satellites.
The corruption of a cryptographic key by a SEU is
considered to be a serious issue, because a single bit change in
the key may damage the entire block of data and lead to severe
increase in retransmission rates. The cryptographic keys are
protected from SEUs by introducing an extra key recovery
module (KRM). The proposed design is tailored for
implementing a secured key for a Tiny Encryption algorithm
(TEA) module resistant to SEU based on the stringent constraints
of power, energy and cost. This paper proposes the FPGA
implementation of TEA algorithm in hardware for onboard
satellite applications.
Keywords: Reconfigurable FPGA, Tiny Encryption algorithm, security, satellites
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