---
id: 7339
title: "Security wall of S7CommPlus - Part 2"
source_domain: blog.viettelcybersecurity.com
source_url: "https://blog.viettelcybersecurity.com/security-wall-of-s7commplus-3/"
published_at: "2022-12-08T10:10:53Z"
tags: ["ot-security", "protocol-analysis", "s7commplus", "siemens", "plc", "ics-security"]
phying_url: "https://phying.com/item/7339"
lang: en
---

# Security wall of S7CommPlus - Part 2

## Summary

Part two of the S7CommPlus series reconstructs Siemens PLC authentication, computing challenge-derived keys and SecurityKeyEncryptedKey fields, then forging the integrity part for start/stop commands.

## Intelligence Metadata

- **Sources:** blog.viettelcybersecurity.com
- **Published:** 2022-12-08T10:10:53Z
- **Original:** https://blog.viettelcybersecurity.com/security-wall-of-s7commplus-3/
- **Phying News:** https://phying.com/item/7339