Services

Four layers, from audit to guarding

Start with a low-friction security audit, harden by risk ranking, and move into crypto and private AI when needed.

01

Security audit

The low-friction entry point. Half a day to audit email authentication, crypto exposure, AI-impersonation risk and network gaps, with a risk-ranked report and remediation plan.

  • Email security audit (SPF/DKIM/DMARC, forwarding rules, anomalous logins)
  • Leak scan (email, phone, identity)
  • Digital hygiene review (passwords, MFA, devices, public footprint)
  • Deliverable: risk-ranked report + remediation quote
From HK$8,800
02

Security retainer

Subscription-based, year-round. Security becomes something someone owns — not something you look for after an incident.

  • Email anti-phishing and network hardening
  • Pre-transfer AI verification with multi-channel confirmation
  • Quarterly audits and monthly briefings
  • Family awareness training and drills
  • Incident response: 15-min pickup / 4-hour engagement
From HK$15,000/mo
03

Crypto asset security

A custody-grade key design for families holding crypto, including long-term accessibility arrangements.

  • Cold/hot wallet layering and multi-sig design
  • Key backup and sharding
  • Asset handover plan (long-term accessibility and continuity)
  • Dedicated signing devices and operating procedures
  • Exchange withdrawal allowlists and time delays
From HK$50,000
04

Private family AI

Hybrid on-device and cloud deployment: sensitive data stays local, general tasks go to the cloud, and data stays in Hong Kong.

  • On-device models (sensitive family files and investment strategy never leave)
  • Private knowledge base (family document retrieval)
  • Cloud models (general queries, translation)
  • Use cases: investment research, family documents, multilingual communication
  • Deliverable: working system + training + maintenance
From HK$100,000

Start with a security audit

LEO GONG · CISSP · CISA · CISP · CCIE · OSCP　／　leog@keystoneguardian.com　／　+852 9551 1011

Book a security audit