Patent ID: 11902424
Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 14:
15. A computer system for securing homomorphic encrypted data, the computer system comprising:
one or more computer processors;
one or more computer readable storage devices; and
stored program instructions on the one or more computer readable storage devices for execution by the one or more computer processors, the stored program instructions comprising:
program instructions to receive fully homomorphically encrypted (FHE) information from a client device;
program instructions to train a machine learning (ML) model using the FHE information, yielding FHE ciphertexts;
program instructions to apply a first transform to the FHE ciphertexts, yielding obfuscated FHE ciphertexts wherein the first transform alters a frequency of ciphertext information;
program instructions to send the obfuscated FHE ciphertexts to a secure device;
program instructions to receive a de-crypted then re-encrypted version of the obfuscated FHE ciphertexts from the secure device;
program instructions to apply a second transform to the re-encrypted version of the obfuscated FHE ciphertexts yielding de-obfuscated re-encrypted FHE ciphertexts;
program instructions to train the ML model using the de-obfuscated re-encrypted FHE ciphertexts, yielding FHE ML model parameters; and
program instructions to send the FHE ML model parameters to the client device.