Mails signature

You're referring to the digital signature of an email!

A digital signature is a way to authenticate the sender of an email and ensure that the message has not been tampered with or altered during transmission. It's similar to a handwritten signature, but instead of being written on paper, it's a digital code that's embedded in the email.

Here are the common types of digital signatures used in emails:

  1. Digital Certificate: A digital certificate is issued by a trusted Certificate Authority (CA) and contains the sender's identity, public key, and other information. The certificate is used to verify the sender's identity and ensure that the email has not been tampered with.
  2. PGP (Pretty Good Privacy): PGP is a popular encryption method that uses a public-private key pair to encrypt and decrypt emails. The sender's public key is used to encrypt the email, and the recipient's private key is used to decrypt it.
  3. S/MIME (Secure/Multipurpose Internet Mail Extensions): S/MIME is a standard for secure email that uses digital certificates and encryption to protect emails. It's commonly used in business and government communications.
  4. OpenPGP: OpenPGP is an open-source implementation of PGP that's widely used for encrypting and decrypting emails.

When you send an email with a digital signature, the recipient can verify the signature to ensure that:

  1. The email comes from the claimed sender.
  2. The email has not been tampered with or altered during transmission.
  3. The email is authentic and has not been forged.

Digital signatures provide an additional layer of security and trust in email communications, making it more difficult for hackers to intercept and alter sensitive information.