/**
 * Encryption class providing end-to-end encryption (E2EE) operations
 * Implements AES-256-GCM with proper IV handling, key derivation, and perfect forward secrecy
 */
export declare class Encryption {
    private readonly ec;
    private readonly SALT_LENGTH;
    private readonly IV_LENGTH;
    private readonly KEY_LENGTH;
    private readonly TAG_LENGTH;
    private readonly ITERATIONS;
    /**
     * Creates a new instance of the Encryption class
     */
    constructor();
    /**
     * Derives a secure encryption key using PBKDF2
     * @param password - The password to derive the key from
     * @param salt - The salt to use for key derivation
     * @returns The derived key
     */
    private deriveKey;
    /**
     * Encrypts data using AES-256-GCM with proper IV handling
     * @param data - The data to encrypt
     * @param key - The encryption key
     * @returns Object containing encrypted data, IV, and salt
     */
    encryptData(data: string, key: string): {
        encrypted: string;
        iv: string;
        salt: string;
        tag: string;
    };
    /**
     * Decrypts data using AES-256-GCM
     * @param encryptedData - The encrypted data object
     * @param key - The decryption key
     * @returns The decrypted data
     */
    decryptData(encryptedData: {
        encrypted: string;
        iv: string;
        salt: string;
        tag: string;
    }, key: string): string;
    /**
     * Generates a secure ECDSA key pair with perfect forward secrecy
     * @returns Object containing public and private keys
     */
    generateECDSAKeyPair(): {
        publicKey: string;
        privateKey: string;
    };
    /**
     * Signs data using ECDSA with deterministic k-value
     * @param data - The data to sign
     * @param privateKey - The private key to use for signing
     * @returns The signature
     */
    signData(data: string, privateKey: string): string;
    /**
     * Verifies an ECDSA signature
     * @param data - The original data
     * @param signature - The signature to verify
     * @param publicKey - The public key to use for verification
     * @returns Whether the signature is valid
     */
    verifySignature(data: string, signature: string, publicKey: string): boolean;
    /**
     * Implements quantum-resistant encryption using CRYSTALS-Kyber
     * @param data - The data to encrypt
     * @param publicKey - The recipient's public key
     * @returns The encrypted data
     */
    quantumResistantEncrypt(data: string, publicKey: string): string;
}