Security Design Calculators

Chapter 9 — Five Interactive Calculators for Sizing, Planning, and Risk Assessment

This chapter provides five real-time interactive calculators that support the design and planning decisions described throughout this guide. Each calculator uses the inputs you provide to instantly compute results, helping you size infrastructure, estimate performance overhead, plan certificate lifecycles, and assess cryptographic risk. All calculations are performed locally in your browser — no data is transmitted.

Calculator 1: TLS Handshake Overhead Estimator
Estimates the additional latency introduced by TLS handshake operations based on connection rate, cipher suite, and session resumption settings.
500
60%
20 ms
Estimated Avg Handshake Latency
--ms
0%
Adjust inputs to see results.
Calculator 2: IPsec Throughput & Tunnel Sizing
Calculates required gateway throughput, tunnel count, and encryption overhead for site-to-site IPsec deployments.
1000 Mbps
10
1024 B
Required Gateway Throughput
-- Gbps
Encryption Overhead
-- %
Effective Throughput
-- Mbps
Recommended Gateways
--
Adjust inputs to see results.
Calculator 3: PKI Certificate Capacity Planner
Plans PKI infrastructure capacity based on certificate volumes, validity periods, and renewal rates to ensure the CA can handle peak issuance loads.
1,000
90 days
30%
50
Peak Daily Certificate Issuances
--certs/day
HSM utilization: --
Adjust inputs to see results.
Calculator 4: SIEM Storage & Retention Planner
Calculates total SIEM storage requirements based on event rates, log sizes, compression ratios, and retention policies.
5,000
500 B
30 days
12 months
Hot Storage Required
-- TB
Cold Storage Required
-- TB
Total Storage
-- TB
Daily Ingest Rate
-- GB/day
Adjust inputs to see results.
Calculator 5: Cryptographic Risk Score Assessment
Assesses the overall cryptographic risk posture of your deployment based on protocol versions, key sizes, algorithm choices, and operational practices. Produces a composite risk score from 0 (critical) to 100 (excellent).
Transport Protocols
Key & Certificate Management
Operational Practices
Composite Cryptographic Risk Score
--/ 100
--
Score Breakdown
Transport
0
Key Mgmt
0
Operations
0
Adjust inputs to see your cryptographic risk assessment.