Harvest-Now-Decrypt-Later: Quantum Crypto Risk Timeline

What is Harvest-Now-Decrypt-Later?

The 'harvest now, decrypt later' scenario refers to the potential threat posed by adversaries who intercept encrypted communications today with the intention of using future quantum computers to break those encryption schemes. This strategy leverages the computational power of quantum computers that can potentially crack current cryptographic algorithms much faster than classical computers.

In this simulation, you'll see how intercepted data accumulates in an adversary's vault and how Mosca’s theorem predicts which parts of it will be decrypted upon the arrival of a cryptographically-relevant quantum computer.

Why Does This Matter?

Current encryption methods such as RSA and ECC are based on mathematical problems that classical computers find infeasible to solve within a reasonable time frame. However, quantum computers can potentially break these algorithms much more efficiently.

The risk of 'harvest now, decrypt later' is particularly significant for long-term data storage and communications where the decryption process could be delayed by decades.

How Mosca’s Theorem Applies

Mosca's theorem provides a framework to estimate the time it will take for a quantum computer to break specific cryptographic algorithms. It takes into account factors such as the size of the key and the computational power required.

In the simulation, you can observe how these parameters influence the timeline of when intercepted data becomes vulnerable to decryption.

Implications for Cybersecurity

The 'harvest now, decrypt later' scenario underscores the need for transitioning from current cryptographic methods to post-quantum cryptography (PQC) that can withstand quantum attacks.

This transition is critical to ensure the security of data and communications in an increasingly quantum-capable world.

Frequently asked questions

Try it live

Everything above runs in your browser — open Harvest-Now-Decrypt-Later: Quantum Crypto Risk Timeline and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.