What is RSA Signature

Introduction to RSA Encryption Algorithm

RSA encryption is a type of asymmetric encryption. It can complete decryption without directly transmitting the key. This ensures the security of information and avoids the risk of being cracked caused by direct transmission of the key. It is encrypted and decrypted by a pair of keys, respectively known as the public key and private key. There is a mathematical relationship between the two. The principle of this encryption algorithm is based on the difficulty of factoring a very large integer to ensure security. Usually individuals keep the private key, and the public key is public (may be held by multiple people at the same time).

The process of RSA signature goes as follows

1.A generates a pair of keys (public key and private key), the private key is not made public and is retained by A. The public key is public and anyone can obtain it.

2.A signs the message with its own private key to form a signature, and transmits the signed message and the message itself to B.

3.After receiving the message, B uses A's public key for signature verification. If the signature transmitted with the message passes verification, it proves that the message was transmitted by A.

In this process, A transmits the signed message and the message itself to B. Even if intercepted by enemies, there is no danger because only A's private key can sign the message. Even if the contents of the message are known, it is impossible to forge a signed reply to B, preventing the content of the message from being tampered with.