RSA

widely used encryption technology which is based on a mathematical algorithm and utilizes both public and private keys for encryption/decryption (named after its three inventors)

In cryptography, RSA is an algorithm for public-key cryptography. It was the first algorithm known to be suitable for signing as well as encryption, and one of the first great advances in public key cryptography. RSA is widely used in electronic commerce protocols, and is believed to be secure given sufficiently long keys and the use of up-to-date implementations.
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<cryptography, company> (The initials of the authors)
1. RSA Data Security, Inc.
2. Their cryptography systems, especially RSA encryption.
The RSA algorithm was first described in the paper:
[R. Rivest, A. Shamir, L. Adleman, "A Method for Obtaining Digital Signatures and Public-key Cryptosystems". CACM 21,2; 1978]
(1995-03-21)

A defined surface surrounding the runway prepared or suitable for reducing the risk of damage to airplanes in the event of an undershoot, overshoot, or excursion from the runway. (FAA12)

Republic of South Africa 
Rivest, Shamir, & Adleman (public key encryption technology)  For more possible definitions for RSA, click here
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