![]() ![]() Multiplying these two numbers is easy, but determining the original prime numbers from the total - or factoring - is considered infeasible due to the time it would take using even today's supercomputers. ![]() RSA derives its security from the difficulty of factoring large integers that are the product of two large prime numbers. RSA signature verification is one of the most commonly performed operations in network-connected systems. It is also used in software programs - browsers are an obvious example, as they need to establish a secure connection over an insecure network, like the internet, or validate a digital signature. Many protocols, including Secure Shell (SSH), OpenPGP, S/MIME, and SSL/ TLS, rely on RSA for encryption and digital signature functions. This attribute is one reason why RSA has become the most widely used asymmetric algorithm: It provides a method to assure the confidentiality, integrity, authenticity, and non-repudiation of electronic communications and data storage. The opposite key from the one used to encrypt a message is used to decrypt it. In RSA cryptography, both the public and the private keys can encrypt a message.
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March 2023
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