![]() This was due to the high cost of maintaining key infrastructure associated with symmetric algorithms. Previously, secure communications was the exclusive domain of sovereign states or global corporations. ![]() The RSA algorithm, along with Diffie-Hellman, stars in one of the more fascinating chapters of technology’s impact on society. This article describes how RSA works at a practical level. Rivest, Shamir, and Adleman were inspired by the Diffie-Hellman paper to conceive of a new but related way to achieve public key, or asymmetric, encryption. The algorithm they came up with became known by their initials: RSA. The trio devised a way to negotiate secure communication between unknown parties over distance, which turns out to be centrally important to the operations of the internet. Hot on the heels of Diffie-Hellman upending the cryptography applecart in 1976 came three more crypto newcomers that further revolutionized the field: Ron Rivest, Adi Shamir, and Leonard Adleman.
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