public key cryptography

Cryptographer Matthew Green says he believes public key cryptography could be lost, warning that the mathematical foundations securing much of the internet may one day stop working. The remark has drawn wide attention, with readers debating threats such as quantum computing and what a breakdown would mean for encryption, online payments and private communications.

Matthew Green, a well-known cryptographer at Johns Hopkins University, has warned that 'we might lose public key cryptography,' the mathematical foundation securing most internet communications, including HTTPS, messaging apps and online banking. His remark has drawn wide attention, with readers debating whether threats like quantum computing could soon break the encryption the web relies on.

Reports say nearly one in three bitcoin is held in wallets whose public keys are exposed, and the share keeps growing. The figure comes from on-chain analysis of spending patterns: once bitcoin is moved from an address, its public key becomes visible, leaving those coins reliant on elliptic curve cryptography alone rather than the stronger hash-based protections of untouched addresses. Commentary focuses on long-term security risks, particularly future quantum computing threats, and on whether holders should move coins to fresh addresses.

A new report on quantum computing and cryptocurrencies concludes that the primary quantum risk lies in the public-key cryptography used to secure wallets, while blockchains themselves remain secure because they rely on hash functions. The report also carries a broader warning for other systems that depend on public-key cryptography, as quantum computers advance toward breaking current encryption standards.

New alerts are circulating that artificial intelligence may accelerate the breaking of elliptic curve cryptography, the public-private key system securing most of the cryptocurrency industry. The warnings claim such a break could happen well before quantum computers become capable of it, raising concerns about the vulnerability of digital assets and existing encryption standards.

Europol says quantum computing does not currently pose a threat to Bitcoin's core cryptography, according to a report circulating in the news. However, the agency cautioned that some wallets remain exposed, particularly older addresses with publicly visible keys that could be targeted as quantum technology matures.

An explanation of public-key cryptography is circulating, using a padlock analogy: to receive a private message, you share an open padlock (your public key) while keeping the key (your private key). Anyone can lock a message with the padlock, but only your private key can open it, so intermediaries cannot read it.

A new educational guide from SunLibCrypto has been published explaining the difference between a public key and a private key in cryptography. The guide promises precise explanations, concrete examples and verifiable sources to help readers understand how these two keys work together to secure crypto wallets and transactions. It targets beginners looking to grasp a foundational concept of digital security and cryptocurrency ownership.