Preamble

Some key concepts are useful to go further in the documentation. They are summarized here, and some informative documentation links are provided.

For normative documentation, consult the ANSSI General Safety Referential and its appendices B1 and B2.

Asymmetric cryptography

It is a cryptographic means that allows anyone to protect a message that will be readable only by the intended recipient. Protection is achieved through the public key of the recipient of a message. The message can then be decrypted by the recipient using his or her private key.

For more information, see the dedicated Wikipedia page.

Symmetric cryptography

It is a cryptographic means of protecting an email or document using a shared secret called a symmetric key. Indeed, unlike asymmetric encryption, in symmetric encryption, the same secret is used both to encrypt and decrypt the message.

For more information, see the dedicated Wikipedia page.