/**
 * Security utilities for CAPTCHA generation
 */
/**
 * Adds consistent timing to prevent timing attacks
 */
export declare function constantTimeDelay(minMs?: number, maxMs?: number): Promise<void>;
/**
 * Generates a secure session token for CAPTCHA verification
 */
export declare function generateSessionToken(): string;
/**
 * Creates a hash of the CAPTCHA solution for secure storage
 */
export declare function hashSolution(solution: string, salt?: string): string;
/**
 * Verifies a CAPTCHA solution against its hash
 */
export declare function verifySolution(solution: string, hashedSolution: string): boolean;
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