![]() ![]() The key generation algorithm boils down to: RSA also relies on modular exponentiation ( a^e mod n) being a one-way function (given c ≡ a^e mod n, computing c is easy but finding a given c, e and n is hard). RSA is based on the fact that it's easy to create and multiply two large prime numbers but it's hard to factorize the product. Only Bob who knows the private key can decrypt the messages. Anyone can securely send messages to Bob by encrypting the contents using the public key. A user (Bob) publishes their public key and keeps the private key secure. Public key crypto involves two keys: a public key and a private key. It is still the main primitive used by TLS (https), GPG, ssh, etc. RSA is a public key cryptosystem developed by Rivest, Shamir and Adleman inġ977. In three different ways (these various issues have been known forĪ long time, however I figured it would be interesting to re-visit them). Let's explore what happens when you don’t get some of this right When using RSA you must ensure that you are using large enough keys, properĭata padding schemes, constant time operations, etc. ![]()
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