Standard cloud AI:
  Client → encrypt → Server decrypts → computes → re-encrypts → Client

WAVIS FHE:
  Client → encrypt → Server computes on ciphertext → Client decrypts
             ↑ Server sees only encrypted data — always

import wavis_fhe as wv

keys = wv.keygen()                      # 5 seconds, done once
ct_a = keys.encrypt(True)              # encrypt locally
ct_b = keys.encrypt(False)
ct_result = keys.nand(ct_a, ct_b)      # server computes — sees nothing
print(keys.decrypt(ct_result))         # True