Quantum Cryptography BB84 simulation
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from dataclasses import dataclass, field
import typing
from random import choice, uniform
@dataclass
class EveBS:
hijack_probability: float = 0.45
my_basises: typing.List[bool] = field(default_factory=list)
obtained_data: typing.List[typing.Optional[bool]] = field(default_factory=list)
def process_photons(self, photons: typing.List[typing.Tuple[bool, bool]]) -> typing.List[typing.Tuple[bool, bool]]:
basis = choice([False, True])
self.my_basises.append(basis)
clicks = [0, 0]
passed = []
for photon in photons:
if uniform(0, 1) <= self.hijack_probability:
photon_bit, photon_basis = photon
if photon_basis == basis:
clicks[photon_bit] += 1
else:
clicks[choice([0, 1])] += 1
else:
passed.append(photon)
if any(clicks) and not all(clicks):
self.obtained_data.append(bool(clicks[1]))
else:
self.obtained_data.append(None)
return passed