export declare const validateEmail: (email: string) => boolean;
export declare const encryptData: (data: string) => string;
export declare const decryptData: (encryptedData: string) => string;
export declare const generateSessionId: () => string;
export declare const formatAuthError: (error: any) => string;
export declare const sanitizeAuthInput: (input: string) => string;
export declare const checkPasswordStrength: (password: string) => {
    score: number;
    feedback: string[];
};