Crate cosmian_cover_crypt 

This instantiation of Covercrypt is based on Curve25519 and Kyber512, and as such delivers 128 bits of both pre- and post-quantum CCA security.

The KEMAC defined in [1] is extended by a PKE interface using AES256-GCM as DEM in the KEM/DEM framework described in [2].

[1] “Covercrypt: an Efficient Early-Abort KEM for Hidden Access Policies with Traceability from the DDH and LWE”, T. Brézot, P. de Perthuis and D. Pointcheval 2023. [2] “A Proposal for an ISO Standard for Public Key Encryption (version 2.1)”, Shoup 2001.

Modules

api

traits

Structs

AccessStructure

CleartextHeader

Structure containing all data encrypted in an EncryptedHeader.

EncryptedHeader

Encrypted header holding a Covercrypt encapsulation of a 256-byte secret, and metadata encrypted under the scheme AES256Gcm using a key derived from the encapsulated secret.

MasterPublicKey

Covercrypt Public Key (PK).

MasterSecretKey

The Covercrypt Master Secret Key (MSK).

QualifiedAttribute

A qualified attribute is composed of a dimension an attribute name.

UserSecretKey

Covercrypt User Secret Key (USK).

XEnc

Covercrypt encapsulation.

Enums

AccessPolicy

An access policy is a boolean expression of qualified attributes.

EncryptionHint

Hint the user about which kind of encryption to use.

Error