RyanZhang's Blog

Add TOTP-based two-factor authentication to Windows Remote Desktop (RDP) with multiOTP to improve remote-login security. Supports mainstream authenticators such as Google Authenticator and Tencent Authenticator.

A practical guide to deploying an FTP server in an XC environment, covering the complete process of installing, configuring, and hardening vsftpd.

A cloud-resource right-sizing model and multidimensional utilization calculation method

A detailed guide to OpenClaw 2026.03, covering one-click Linux deployment, Feishu bot long connections, and local-model integration. It explores the security philosophy of private AI, emphasizing least privilege and data boundaries so idle hardware can become a powerful private assistant without sacrificing privacy.

This guide explains how to use the free MbnSms utility to send and receive SMS on a Windows laptop with a built-in LTE/4G module, including hardware monitoring, Chinese encoding issues, and verification-code replies.

2025 brought growth, exhaustion, and distant horizons. I still love being an engineer, but I also need to learn to grow for myself.

With proper authorization, phishing simulations are an important way to assess an organization's security awareness and defenses. This article covers a disciplined, safe, and controlled 2025 simulation, from information gathering and attack-surface analysis to simulated-page assessment, platform selection, and data collection.

Use testssl.sh to perform comprehensive compliance and security checks on a site's SSL/TLS configuration.

A complete pseudo-data-center built from retired servers, 10Gbps fiber, business broadband, and self-managed tunnels. It has reliably hosted automated backups, off-site NAS synchronization, databases, and code repositories for over half a year, proving that a highly available local server room is possible on a low budget. This is, of course, just for fun.

Not to escape, but to rediscover the warmth of life.