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Python implements encryption and decryption for RSA The following table lists the key length corresponding to the same security level. The RSA key length increases with the confidential level, and the increase is fast. In the SET (Secure Electronic Transaction) protocol, CA is required to use a 2048BITS long key, and other entities use 1024 bits of keys. As of 2017, it is generally considered to be the best public key plan. From the past more than 30 years, the RSA has experienced the test of various attacks. RSA is the most widely studied public key algorithm. The RSA algorithm is the first algorithm that can be used for encryption and digital signatures, and is also easy to understand and operate. After the other party receives the information, decrypt and check the information summary with different keys. In order to reduce the amount of calculation, when transmitting information, the traditional encryption method is often used in combination with the public key encryption method, that is, the information is encrypted with the improved DES or IDEA key, and then use the RSA key encryption dialogue key and information summary. This makes the encryption amount of the calculation. In order to improve the confidentiality strength, the RSA key is at least 500 seats, which is generally recommended for 1024 bits. It is usually a pair of RSA keys, one of which is the confidential key, saved by the user the other is the public key, it can be publicly open, even You can register in the web server. In 1978, the famous RSA algorithm has occurred. Although the decryption key SK is determined by the public key PK, SK cannot be calculated from PK. The encryption algorithm E and the decision algorithm D are also disclosed. In the public key cryptosystem, the encryption key (ie, the public key) PK is an open information, and the decryption key (ie, the secret key) SK is required to be confidential. The so-called public key cryptographic system is a "cryptographic" cryptographic system that is "known encrypted key to the decryption key in the calculation" by using different encryption keys and decryption keys.