/**
 * Message encryption schemes for different message types.
 *
 * @remarks
 * - NONE: Unencrypted messages (broadcast only)
 * - SHARED_KEY: Network-wide shared key encryption
 * - RECIPIENT_KEYS: Per-recipient public key encryption
 * - S_MIME: S/MIME encryption with signing (per RFC 5751)
 * - GPG: OpenPGP encryption and signing (per RFC 4880 / RFC 3156)
 *
 * @see Requirements 3.1, 3.2, 3.3, 10.1, 10.2, 16.6
 */
export declare enum MessageEncryptionScheme {
    NONE = "none",
    SHARED_KEY = "shared_key",
    RECIPIENT_KEYS = "recipient_keys",
    S_MIME = "s_mime",
    GPG = "gpg"
}
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