Skip to main content

hetorch.backend.base

Abstract backend interface for HE operations

Classes​

Ciphertext(args, kwargs)​

Abstract ciphertext representation

This is a base class that all backend-specific ciphertext implementations should inherit from.

HEBackend(args, kwargs)​

Abstract interface for HE backend implementations

This defines the contract that all HE backends must implement, whether they are real (SEAL, OpenFHE) or fake (PyTorch simulation).

Methods:

bootstrap(self, ct: hetorch.backend.base.Ciphertext) -\> hetorch.backend.base.Ciphertext​

Bootstrap ciphertext to refresh noise budget

Args: ct: Ciphertext to bootstrap

Returns: Bootstrapped ciphertext

Raises: NotImplementedError: If backend doesn't support bootstrapping

cadd(self, ct1: hetorch.backend.base.Ciphertext, ct2: hetorch.backend.base.Ciphertext) -\> hetorch.backend.base.Ciphertext​

Ciphertext addition

Args: ct1: First ciphertext ct2: Second ciphertext

Returns: Result ciphertext (ct1 + ct2)

cmult(self, ct1: hetorch.backend.base.Ciphertext, ct2: hetorch.backend.base.Ciphertext) -\> hetorch.backend.base.Ciphertext​

Ciphertext multiplication

Args: ct1: First ciphertext ct2: Second ciphertext

Returns: Result ciphertext (ct1 * ct2)

decrypt(self, ct: hetorch.backend.base.Ciphertext) -\> torch.Tensor​

Decrypt a ciphertext to plaintext tensor

Args: ct: Ciphertext to decrypt

Returns: Decrypted tensor

encrypt(self, tensor: torch.Tensor, info: hetorch.core.ciphertext.CiphertextInfo = None) -\> hetorch.backend.base.Ciphertext​

Encrypt a plaintext tensor

Args: tensor: Input tensor to encrypt info: Optional ciphertext metadata

Returns: Encrypted ciphertext

get_cost_model(self) -\> hetorch.backend.cost_model.CostModel​

Return cost model for this backend

Returns: CostModel instance for estimating operation costs

get_supported_operations(self) -\> List[str]​

Return list of supported HE operations

Returns: List of operation names (e.g., ["cadd", "cmult", "rotate"])

padd(self, ct: hetorch.backend.base.Ciphertext, pt: torch.Tensor) -\> hetorch.backend.base.Ciphertext​

Add plaintext to ciphertext

Args: ct: Ciphertext pt: Plaintext tensor

Returns: Result ciphertext (ct + pt)

Raises: NotImplementedError: If backend doesn't support plaintext operations

pmult(self, ct: hetorch.backend.base.Ciphertext, pt: torch.Tensor) -\> hetorch.backend.base.Ciphertext​

Multiply ciphertext by plaintext

Args: ct: Ciphertext pt: Plaintext tensor

Returns: Result ciphertext (ct * pt)

Raises: NotImplementedError: If backend doesn't support plaintext operations

rescale(self, ct: hetorch.backend.base.Ciphertext) -\> hetorch.backend.base.Ciphertext​

Rescale ciphertext (CKKS)

Args: ct: Ciphertext to rescale

Returns: Rescaled ciphertext

Raises: NotImplementedError: If backend doesn't support rescaling

rotate(self, ct: hetorch.backend.base.Ciphertext, steps: int) -\> hetorch.backend.base.Ciphertext​

Ciphertext rotation

Args: ct: Input ciphertext steps: Number of rotation steps

Returns: Rotated ciphertext