Cryptanalysis of rsa and its variants

In this work we are analyzing the RSA cryptosystem and three different variants of RSA - CRT-RSA, Multi-Prime RSA and Multi-Power RSA. We delve into theory of every variant, practically compare them to each other and review the results. From the results it is seen that classic RSA cryptosystem is good enough to securely encrypt messages, although, if we are looking for speed, RSA's variants should be considered instead. These variants ensure the same level of security as the classical system and offer faster encryption and decryption times due to their implementation. In conclusion, the RSA cryptosystem is and, most likely, will be for a long time, a reliable and secure public key cryptosystem