Described are various embodiments of a tamper-evident network messaging method and system, and device configured therefor. In some embodiments, tamper-evident messaging is enabled between network-interfacing devices. In general, these devices will each comprise a hardware hasher or the like, operatively configured to compute and supply a hash value to their respective network interface via an independent path distinct from the device's one or more software-accessible paths, where it may be combined with outgoing messages to provide indication of possible code tampering, or again evaluated against incoming hash values associated with incoming messages to verify an authenticity thereof. In some embodiments, such hash values may further or alternatively be used for the encryption/decryption of intercommunicated messages to provide a similar effect.