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As the standard for public key cryptosystems, RSA cryptosystem is the most widely used encryption and decryption technique. Developed by three researchers at MIT (Massachusetts Institute of Technology) in 1978 (Ronald Rivest, Adi Shamir, and Leonard Adleman), RSA was the world's first public key cryptosystem. By utilizing a mathematical property known as the difficulty of integer factorization--that is, by increasing key length--the security by RSA cryptosystem can be strengthened. However, as the security becomes stronger, the data capacity used becomes bigger and the processing load increases accordingly. This characteristic is considered a major drawback of RSA cryptosystem.