Understanding Encryption and Quantum Cryptography

Why was encryption once considered a weapon by the United States?

• It was used in military operations.

• It was developed by the military.

• It was used to create bombs.

• It was seen as a threat to national security.

What is a simple substitution code?

• A code that uses colors to represent letters.

• A code that uses symbols to represent words.

• A code that swaps each letter for another letter.

• A code that uses numbers to represent letters.

What is a one-way function in encryption?

• A function that is easy to reverse.

• A function that is impossible to compute.

• A function that is easy to compute but hard to reverse.

• A function that uses colors to encode messages.

Why are prime numbers used in encryption?

• They are easy to multiply but hard to factor.

• They are easy to find and use.

• They are the largest numbers available.

• They are the smallest numbers available.

What is a major limitation of traditional encryption methods?

• They are too expensive to implement.

• They are not secure enough for military use.

• They are easily broken by modern computers.

• They require too much energy to use.

How does quantum cryptography ensure secure communication?

• By using traditional encryption methods.

• By using polarized photons to create random keys.

• By using large prime numbers.

• By using complex mathematical equations.

What happens if an eavesdropper tries to intercept a quantum key?

• The key remains unchanged.

• The key becomes stronger.

• The key changes, alerting the sender and receiver.

• The key is destroyed.

What is a challenge in implementing quantum cryptography?

• It is not secure enough for practical use.

• Maintaining photon polarization is difficult.

• It is too expensive to produce.

• It requires a lot of energy.

What would need to change for quantum encryption to become commercially viable?

• The internet's infrastructure.

• The speed of traditional computers.

• The size of quantum keys.

• The cost of quantum computers.

How does quantum cryptography differ from traditional methods?

• It is easier to understand.

• It is faster to implement.

• It relies on the unpredictability of nature.

• It uses larger prime numbers.