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Public key is a cornerstone of digital security, playing a crucial role in data encryption and authentication processes. Every user possesses a pair of keys in a two-key encryption system: a publicly shared “public key” and a confidential “private key.”
What is a Public Key and Its Purpose?
Public key is a mathematical tool used in asymmetric encryption systems. It is shared openly to encrypt data or verify digital signatures. The private key is kept secret by its owner, and data encrypted with the public key can only be decrypted by the matching private key.
This system offers an ideal structure for secure communication. For instance, the credit card information you send to a website is encrypted using the site’s public key. Only the site’s private key can decrypt this information, thereby protecting it from third parties.
How Does Public Key Work?
Asymmetric encryption is a technology developed in the 1970s. The public and private keys are mathematically linked, yet deriving one from the other is nearly impossible, explained by the concept of a “one-way function.”
