The server holds your most sensitive data. You need answers about who can see it, and how it can be safe even while in use. Homomorphic encryption is the answer most security architects are now testing. It allows computation on encrypted data without ever decrypting it. That means the server never sees the raw values, yet it can still run queries, aggregate, and produce correct results.
A proper homomorphic encryption security review starts with the cryptosystem itself. Full homomorphic encryption (FHE) supports arbitrary computation; partial schemes like somewhat homomorphic encryption (SHE) limit the depth of operations. For practical application security, you must identify which scheme is implemented, verify correctness of the math, and check assumptions against current cryptanalysis.
Key generation and distribution are essential points. Keys must remain on the client side. Any leakage gives full access to the underlying plaintext. Secure key management using hardware security modules or strong client-side storage is mandatory. Audit the code paths for encryption and decryption to ensure zero accidental plaintext exposure.
Performance is a real factor in a homomorphic encryption security review. Some FHE operations are still orders of magnitude slower than non-encrypted computation. This impacts both latency and cost. A good review includes benchmarking under real workloads to measure feasibility before production rollout.