Email encryption can be defined as an encryption and authentication mechanism of an email message which inhibits the contents from being read and accessed by an unapproved recipient. Email encryption procedure principally depends on public key cryptography where the end-users issue a public key that can be used by others to encrypt the messages. Henceforth, keeping a secret private key to decrypt messages or to symbol and digitally encrypt messages they send.
It also smartly camouflages the email content from counterspies by encrypting it into an indecipherable form. Emails can be encrypted and decrypted simply through creation of digital signature mechanism that uses both public and private keys. Generally, the public key is communal with everyone while on the other hand the private key is not concealed to everyone.
Following are some frequently used email encryption protocols:
- Identity based encryption
- Mail session encryption