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

Claim 0:
1. A computer implemented method, the method comprising:
receiving fully homomorphically encrypted (FHE) information from a client device;
training a machine learning (ML) model using the FHE information, yielding FHE ciphertexts;
applying a first transform to the FHE ciphertexts, yielding obfuscated FHE ciphertexts wherein the first transform alters a frequency of ciphertext information;
sending the obfuscated FHE ciphertexts to a secure device;
receiving a de-crypted and then re-encrypted version of the obfuscated FHE ciphertexts from the secure device;
applying a second transform to the re-encrypted version of the obfuscated FHE ciphertexts yielding de-obfuscated re-encrypted FHE ciphertexts;
training the ML model using the de-obfuscated re-encrypted FHE ciphertexts, yielding FHE ML model parameters; and
sending the FHE ML model parameters to the client device.