pub const FORTRESS_EMPTY_SALT: [u8; 16];Expand description
Fixed salt for Fortress empty-passphrase optimization. When passphrase is empty, we use this deterministic salt so it doesn’t need to be embedded in the frame (saving 16 bytes). The message is still AES-encrypted so the payload looks random for steganalysis resistance. NOT secret — just a constant to feed into AES key derivation.