Secret-key cryptography
libsodium-net secret-key cryptography areas:
Secret-key authenticated encryption
- Encrypts a message with a key and a nonce to keep it confidential
- Computes an authentication tag. This tag is used to make sure that the message hasn't been tampered with before decrypting it.
Secret-key authenticated encryption
Secret-key authentication
Authenticate or verifie a message with an authentication tag, this does not encrypt the message.
Authenticated Encryption with Additional Data
- Encrypts a message with a key and a nonce to keep it confidential
- Computes an authentication tag. This tag is used to make sure that the message, as well as optional, non-confidential (non-encrypted) data, haven't been tampered with.
A typical use case for additional data is to store protocol-specific metadata about the message, such as its length and encoding.