/**
 * Browser-compatible keyring implementation using Web Crypto API and localStorage
 */
export declare class BrowserKeyring {
    private static instance;
    private readonly keys;
    private readonly accessLog;
    private readonly maxAccessRate;
    private constructor();
    static getInstance(): BrowserKeyring;
    private deriveKey;
    storeKey(id: string, data: Uint8Array, password: string): Promise<void>;
    retrieveKey(id: string, password: string): Promise<Uint8Array>;
    private checkRateLimit;
    private logAccess;
    private persistToStorage;
    private loadFromStorage;
    initialize(): Promise<void>;
    rotateKey(id: string, oldPassword: string, newPassword: string): Promise<void>;
}
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