Module aead 

XChaCha20-Poly1305 authenticated encryption of the payload.

The payload is compressed before it is encrypted, never the other way round: ciphertext is indistinguishable from random and therefore incompressible, so compressing afterwards would cost time and save nothing. Compressing first also shrinks what has to be embedded, which directly lowers the bits per pixel the embedding layer needs — the single most important factor in staying invisible to steganalysis.

Structs

XChaCha20Poly1305Cipher

The production cipher: XChaCha20-Poly1305.

Enums

AEADError

Failures of the authenticated encryption primitive.

CryptoError

Failures of the combined compression and encryption stages.

Traits

AEADCipher

Authenticated encryption with associated data.

Functions

compress_and_encrypt

Compresses plaintext with Zstandard and then encrypts the result.

decrypt_and_decompress

Decrypts ciphertext and decompresses the authenticated result.