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The emergence of quantum computers is considered the biggest existential threat to blockchain and cryptocurrencies. Post-quantum cryptography (pqc) is the field that is working to address this threat and secure future cryptocurrencies.

1. Quantum Threat: Why Will Current Cryptography Break?

Currently, the security of cryptocurrency networks relies on two main cryptographic algorithms. To create digital signatures, which ensure that transactions are only authorized by the rightful owner. Quantum computers can break this public-key cryptography very quickly using Shor's Algorithm. This means that an attacker can calculate the corresponding private key from someone's public address in a very short time. To secure the blockchain (e.g. Bitcoin mining and block linking). Hashing algorithms can be weakened using Grover's Algorithm. Although Grover's Algorithm is not as destructive as Shor's Algorithm, it will speed up the hashing process, making it easier for mining and brute-force attacks. As a result, when a powerful quantum computer is built,:

• An attacker will be able to steal the private key of any crypto wallet using its public address.
• It will be possible to transfer all funds to another wallet, which will undermine the basic security framework of cryptocurrencies.

2. What is Post-Quantum Cryptography (PQC)?

Post-quantum cryptography (PQC) is a set of new cryptographic algorithms designed to be secure against attacks from both conventional computers and potentially powerful quantum computers. Types of PQC (Quantum-resistant Algorithms) PQC is based on solving various mathematical problems, the main ones being

Types of PQCMathematical basisUses for cryptoLattice-Based Cryptography (Lattice-Based)Hard problems on high-dimensional geometric grids.Most promising for quantum-resistant digital signatures and encryption.Hash-Based Cryptography (Hash-Based)Uses hashing functions such as SHA-256 in blockchains.Used for digital signatures (e.g. Lamport Signatures). It is currently secure, but has some limitations in use.Code-Based Cryptography (Code-Based)Uses Error-Correcting Codes.Stable for encryption, but produces relatively large 'keys'.

Currently, the US National Institute of Standards and Technology (NIST) is working on PQC standardization, which aims to select a quantum-resistant algorithm for global use.

3. Securing the future of cryptocurrencies

Cryptocurrency networks need to adopt quantum-resistant algorithms now, which will help avoid a future "crypto disaster". Blockchains must make changes to their core code through a hard fork or soft fork to include a quantum-resistant digital signature algorithm instead of the existing ECDSA algorithm. This change will be complex and requires consensus from the entire community to accept it. To reduce the risk of migration, networks can temporarily use hybrid signatures. In this system, a transaction would be signed by two algorithms simultaneously: a traditional one (ECDSA) and a quantum-resistant one (PQC). As a result, as long as both algorithms are secure, the transaction would be secure. Users who currently hold their cryptocurrency in an old public address (one that has been transacted with once) will find their funds most at risk with the advent of quantum computers. Therefore, users should be prepared to quickly move their crypto to a quantum-safe address.

In short

In short, the blockchain industry needs to quickly adopt PQC before the threat of quantum computing becomes a reality. This is not just a technological change, but a mandatory step to ensure the long-term security and viability of cryptocurrencies. Today's discussion concludes here. I hope you've found it interesting. Please share your thoughts on today's topic. Prayers for everyone.