Abstract
Hermes is a domain-specific language for writing light-weight encryption algorithms: It is reversible, so it is not necessary to write separate encryption and decryption procedures, and it avoids several types of side-channel attacks, both by ensuring no secret values are left in memory and by ensuring that operations on secret data spend time independent of the value of this data, thus preventing timing-based attacks. We show a complete formal specification of Hermes, argue absence of timing-based attacks (under reasonable assumptions), and compare implementations of well-known light-weight encryption algorithms in Hermes and C.
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