What is mail encryption, what is digital signature, and what security functions are provided?
Mail encryption is the process of converting mail from plaintext to ciphertext. Digital signature is an encrypted message summary attached to the message, which simulates the autograph or seal in the file to ensure the authenticity of the file. Digital signature is one of the authentication technologies, and authentication mainly includes three aspects: message authentication, digital signature and identity authentication. Encryption and authentication are common means of information protection in the field of modern information security.