Minimum security level?

[dnat112]

For all the examples I try to run, including the simple matrix multiply example in the "examples" folder, I get an output which says

[WARN] 2020-02-23T08:18:04z src/seal/seal_util.cpp 36 Parameter selection does not enforce minimum security level

I have tried using every parameter setting in the "configs" folder.

Is this the expected behavior?

[fboemer]

The warning will be emitted for any parameter selection which sets security_level: 0. Unfortunately, the default parameters use security_level: 0, so this warning will be printed several times. As long as you set security_level >= 128 (e.g. https://github.com/IntelAI/he-transformer/blob/master/configs/he_seal_ckks_config_N13_L7.json#L4), you will have appropriate security.

So it is expected, but not ideal, behavior. I'll leave this open to fix.

[dnat112]

I actually get this message for every parameter setting in the configs folder, including N13_L7.

For example, the command:

python examples/ax.py --backed=HE_SEAL --encryption_parameters=configs/he_seal_ckks_config_N13_L7.json

produces this as output:

config graph_options {
  rewrite_options {
    meta_optimizer_iterations: ONE
    min_graph_nodes: -1
    custom_optimizers {
      name: "ngraph-optimizer"
      parameter_map {
        key: "device_id"
        value {
          s: ""
        }
      }
      parameter_map {
        key: "enable_client"
        value {
          s: "False"
        }
      }
      parameter_map {
        key: "encryption_parameters"
        value {
          s: "configs/he_seal_ckks_config_N13_L7.json"
        }
      }
      parameter_map {
        key: "ngraph_backend"
        value {
          s: "HE_SEAL"
        }
      }
    }
  }
}

Result:  [[2. 3. 4. 5.]]
[WARN] 2020-02-26T20:06:14z src/seal/seal_util.cpp 36	Parameter selection does not enforce minimum security level
[WARN] 2020-02-26T20:06:14z src/seal/seal_util.cpp 36	Parameter selection does not enforce minimum security level
[WARN] 2020-02-26T20:06:14z src/seal/seal_util.cpp 36	Parameter selection does not enforce minimum security level
[WARN] 2020-02-26T20:06:14z src/seal/seal_util.cpp 36	Parameter selection does not enforce minimum security level

[fboemer]

This is the result of the default encryption parameters here, which are used before the --encryption_parameters argument is processed.

[jchen98]

I am also experiencing the same issue when I try to use configuration files even with security level >= 128. If I am understanding this correctly, are you saying that the warnings are before the processing step, but the matrix multiplication is actually run with the correct security level in the config?

[fboemer]

Yes, this is correct.