Quantum Encryption Library

The Quantum Blockchain Adventure

In a world where digital currencies were becoming the norm, Bob and Alice were two brilliant cryptographers with a vision. They wanted to create a new Bitcoin blockchain that was not only secure but also future-proof against the looming threat of quantum computers.

The Meeting of Minds

Bob, a seasoned blockchain developer, had been working on Bitcoin projects for years. Alice, a quantum physicist, had recently made breakthroughs in quantum encryption. They met at a tech conference and quickly realized that their combined expertise could revolutionize the world of digital currencies.

The Plan

They decided to create a new Bitcoin blockchain, which they named Quantum Bitcoin. This blockchain would use quantum encryption to secure transactions, making it immune to the potential threats posed by quantum computers.

Setting Up the Quantum Encryption Library

Alice took the lead in developing the quantum encryption library. She implemented the BB84 protocol, which uses quantum bits (qubits) to create a secure key exchange. This protocol ensured that any attempt to eavesdrop on the communication would be detected, as measuring qubits alters their state.

Here’s a simplified version of the quantum encryption library they developed:

import numpy as np

class BB84:
    def __init__(self, key_length):
        self.key_length = key_length
        self.bases = np.random.choice(['+', 'x'], key_length)
        self.bits = np.random.randint(0, 2, key_length)
    
    def encode(self):
        encoded_bits = []
        for bit, base in zip(self.bits, self.bases):
            if base == '+':
                encoded_bits.append(bit)
            else:
                encoded_bits.append(1 - bit if bit == 0 else 0)
        return encoded_bits
    
    def measure(self, encoded_bits, bases):
        measured_bits = []
        for encoded_bit, base, original_base in zip(encoded_bits, bases, self.bases):
            if base == original_base:
                measured_bits.append(encoded_bit)
            else:
                measured_bits.append(np.random.randint(0, 2))
        return measured_bits
    
    def sift_key(self, measured_bits, bases):
        sifted_key = []
        for measured_bit, base, original_base in zip(measured_bits, bases, self.bases):
            if base == original_base:
                sifted_key.append(measured_bit)
        return sifted_key

# Example usage
alice = BB84(key_length=128)
bob = BB84(key_length=128)

# Alice encodes her bits
encoded_bits = alice.encode()

# Bob measures the bits with random bases
bob_bases = np.random.choice(['+', 'x'], 128)
measured_bits = bob.measure(encoded_bits, bob_bases)

# Both share their bases and sift the key
alice_bases = alice.bases
sifted_key_alice = alice.sift_key(measured_bits, bob_bases)
sifted_key_bob = bob.sift_key(measured_bits, alice_bases)

print("Alice's sifted key:", sifted_key_alice)
print("Bob's sifted key:", sifted_key_bob)

Building the Blockchain

With the quantum encryption library in place, Bob integrated it into the blockchain. Each transaction was now secured with quantum keys, making it virtually unhackable. They also created a new Genesis Block, marking the beginning of their Quantum Bitcoin blockchain.

The Launch

After months of hard work, Bob and Alice launched Quantum Bitcoin. The crypto community was amazed by the innovation and security it offered. Transactions were faster, more secure, and resistant to future quantum threats.

The Future

Bob and Alice’s Quantum Bitcoin became a benchmark for future digital currencies. Their collaboration showed the world the power of combining blockchain technology with quantum encryption, paving the way for a new era of secure digital transactions.

I hope you enjoyed the story! If you have any more questions or need further details, feel free to ask. Copyright 2024 by Martin Döhring, Engelstrasse 37 in D-55124 Mainz martindoehring@msn.com