stern¶

class cryptographic_estimators.SDEstimator.SDAlgorithms.stern.Stern(problem: SDProblem, **kwargs)¶

Bases: SDAlgorithm

Construct an instance of Stern’s estimator [Ste88], [BLP08].

Expected weight distribution:

<—-+ n - k - l +—->
w - 2p

<– l –>
0

<–+ k/2 +–>
p

<–+ k/2 +–>
p

Parameters:: problem (SDProblem) – Object including all necessary parameters.

Examples

>>> from cryptographic_estimators.SDEstimator.SDAlgorithms import Stern
>>> from cryptographic_estimators.SDEstimator import SDProblem
>>> Stern(SDProblem(n=100,k=50,w=10))
Stern estimator for syndrome decoding problem with (n,k,w) = (100,50,10) over Finite Field of size 2

property attack_type¶: Returns the attack type of the algorithm.

property complexity_type¶: Returns the attribute _complexity_type.

get_optimal_parameters_dict()¶: Returns the optimal parameters dictionary.

has_optimal_parameter()¶

Return True if the algorithm has optimal parameter.

Tests:

>>> from cryptographic_estimators import BaseAlgorithm, BaseProblem
>>> BaseAlgorithm(BaseProblem()).has_optimal_parameter()
False

initialize_parameter_ranges()¶: Initialize the parameter ranges for p and l to start the optimization process.

l()¶

Return the optimal parameter $l$ used in the algorithm optimization.

Examples

>>> from cryptographic_estimators.SDEstimator.SDAlgorithms import Stern
>>> from cryptographic_estimators.SDEstimator import SDProblem
>>> A = Stern(SDProblem(n=100,k=50,w=10))
>>> A.l()
9

property memory_access¶: Returns the attribute _memory_access.

memory_access_cost(mem: float)¶

Returns the memory access cost (in logarithmic scale) of the algorithm per basic operation.

Parameters:: mem (float) – Memory consumption of an algorithm.
Returns:: Memory access cost in logarithmic scale.
Return type:: float

Note

memory_access: Specifies the memory access cost model (default: 0, choices: 0 - constant, 1 - logarithmic, 2 - square-root, 3 - cube-root or deploy custom function which takes as input the logarithm of the total memory usage)

memory_complexity(**kwargs)¶

Return the memory complexity of the algorithm.

Parameters:

**kwargs –

Arbitrary keyword arguments.

optimal_parameters - If for each optimal parameter of the algorithm a value is provided, the computation is done based on those parameters.

optimal_parameters()¶

Return a dictionary of optimal parameters.

Tests:

>>> from cryptographic_estimators import BaseAlgorithm, BaseProblem
>>> BaseAlgorithm(BaseProblem()).optimal_parameters()
{}

p()¶

Return the optimal parameter p used in the algorithm optimization.

Examples

>>> from cryptographic_estimators.SDEstimator.SDAlgorithms import Stern
>>> from cryptographic_estimators.SDEstimator import SDProblem
>>> A = Stern(SDProblem(n=100, k=50, w=10))
>>> A.p()
2

parameter_names()¶

Return the list with the names of the algorithm’s parameters.

Tests:

>>> from cryptographic_estimators import BaseAlgorithm, BaseProblem
>>> BaseAlgorithm(BaseProblem()).parameter_names()
[]

property parameter_ranges¶

Returns the set ranges for optimal parameter search.

Returns the set ranges in which optimal parameters are searched by the optimization algorithm (used only for complexity type estimate).

quantum_time_complexity()¶: Return quantum gate complexity

r()¶: Returns the optimal parameter r used in the optimization of the M4RI Gaussian elimination.

reset()¶: Resets internal state of the algorithm.

set_parameter_ranges(parameter: str, min_value: float, max_value: float)¶

Set range of specific parameter.

If optimal parameter is already set, it must fall in that range.

Parameters:

parameter (str) – Name of parameter to set
min_value (float) – Lowerbound for parameter (inclusive)
max_value (float) – Upperbound for parameter (inclusive)

set_parameters(parameters: dict)¶

Set optimal parameters to predefined values, then do not allow optimization to modify the ranges again.

Parameters:: parameters (dict) – A dictionary including parameters to set (for a subset of optimal_parameters functions).

time_complexity(**kwargs)¶

Return the time complexity of the algorithm.

Parameters:

**kwargs –

Arbitrary keyword arguments.

optimal_parameters - If for each optimal parameter of the algorithm a value is provided, the computation is done based on those parameters.