Nowadays, our everyday life is heavily dependent on technology. It’s becoming more and more crucial for someone to depend on technologies like smart phones for activities including payments, making online deals, and even verifying identities in some countries. Now you might be thinking with all that tremendous amount of data, how should we secure it? How should we prevent others from tampering with them and steal our identities without our permission? The answer is cryptography. However, with the rapid advancements in quantum computing, traditional cryptographic systems face the threat of becoming obsolete.

Cryptography is the key to making all our technologies communicate securely with others. It allows us to talk to our loved ones without someone actively listening and making sense of what’s being sent. It allows them to verify we are actually their loved ones whom they are talking to and not anyone else! But how can this done exactly?

Firstly, let’s dive a bit into the foundations of cryptography. Cryptography has been an integral part of human history, dating back to ancient civilizations. Its evolution from simple substitution ciphers to complex mathematical algorithms has mirrored advancements in technology. The two primary types of cryptography are symmetric-key cryptography, where the same key is used for both encryption and decryption, and public-key cryptography, which involves a pair of keys (public and private) for encryption and decryption.

With all those amazing cryptography use cases and advancements it has allowed us to reach, it also has some weaknesses. Now the condition that is necessary to making cryptography effective is securing the key’s used for communication and making them large and random enough to being theoretically impossible to break and guess right in a reasonable amount of time. Some keys take millions of years to brute-force and go through each possible key within the key space provided by the algorithm! However, quantum computing is one tough of an opponent to that!

Quantum Computers have the ability to perform mathematical calculations exponentially faster than traditional personal computers. Now that might be a threat to cryptographic algorithms, considering most were made before quantum computers! Quantum computers, that are leveraging principles of quantum mechanics, have the potential to break widely used encryption methods, such as RSA and ECC (Elliptic Curve Cryptography), by efficiently solving certain mathematical problems that form the basis of these algorithms.

As always, we humans thrive for improvement and with the race between quantum computing and modern cryptography; both must keep up and so does the upcoming cryptographic algorithms that also need to counter the effects quantum computing might lead to if left to break all currently used cryptography that out everyday lives and technological communications depends on! This is where the post-quantum era starts to shine.

Post-quantum cryptography refers to cryptographic algorithms designed to resist attacks by quantum computers. Researchers are exploring variety of approaches, including lattice-based cryptography, hash-based cryptography, code-based cryptography, and multivariate polynomial cryptography.

Lattice-based cryptography, for example, relies on the hardness of certain mathematical problems related to lattices, offering a promising foundation for secure communication in a post-quantum world. Hash-based cryptography utilizes hash functions to secure communication, while code-based cryptography leverages error-correcting codes. Multivariate polynomial cryptography involves solving systems of multivariate polynomial equations for security.

To conclude, the role of cryptography in securing our digital world is becoming more critical than ever. The ongoing efforts to develop and standardize post-quantum cryptographic algorithms demonstrate the commitment of the global community to staying ahead of potential threats. As quantum computers continue to advance, the collaboration between researchers, industry, and policymakers will be essential in ensuring the security of our digital infrastructure in the post-quantum era. It is our responsibility to balance the race between quantum computing and cryptography; this is only possible with the success of upcoming post-quantum techniques.