  The impeccable design of sensitive and cryptographic circuits (CC) against
fault injection attacks is essential for modern data storage, communication,
and computation systems that are susceptible to fault injection attacks. The
robustness of a CC against voltage glitch attacks increases with an on-chip
voltage regulator that considers the impact of topology and component selection
on the fault injection robustness. With an emphasis on increasing the number of
phases in a multiphase voltage regulator and component selection, an on-chip
voltage regulator with multiphase configuration and an optimal operating point
is proposed as a lightweight countermeasure to minimize injected glitches.
Furthermore, an infective countermeasure is added to the on-chip multiphase
voltage regulator that contaminates the computation of the cryptographic
algorithm when a voltage glitch reaches to the CC. By increasing the number of
phases from 1 to 16, the confrontation with fault attacks increases by 52.45%,
which is equal to 91.82% if the number of phases increases to 32. Using the
infective countermeasure for fault resiliency, the security-enhanced CC
provides a robust and resilient solution against fault attacks that improve the
security and availability of the device.
