Multiplying two large primes is easy, but recovering them from the product is extremely hard. Public key systems such as RSA rely on that gap to keep messages secret.
Starter thread · AI-reviewed against its sources
Public-key encryption uses a linked pair of keys: a public key anyone can use to lock a message, and a private key that only its owner holds to unlock it.
Starter thread · AI-reviewed against its sources
The Voynich manuscript is a roughly 240-page illustrated codex in an undeciphered script, made in 15th-century Europe and held at Yale. Its meaning and purpose remain unknown.
Starter thread · AI-reviewed against its sources
