Google has added HEIR to its Private Computing Toolkit, positioning the open-source compiler as a bridge between machine-learning workflows and homomorphic encryption.
Why homomorphic encryption matters
Ordinary encryption protects data at rest and in transit, but computation usually requires decryption. Homomorphic encryption allows selected operations on encrypted data, potentially enabling inference without revealing the underlying input to the service performing it.
What changed
HEIR focuses on compiler infrastructure: translating higher-level programs into cryptographic representations and optimizing them across schemes and hardware. Google highlighted encrypted anomaly detection and hotword detection as examples.
What remains hard
Encrypted computation still carries performance, engineering, and model-design costs. “Practical” depends on workload size, latency, threat model, and accuracy. This is meaningful infrastructure progress, not a universal privacy switch.