Alexander Köppe
Https Www.linkedin.com In Alexander-köppe-269477160 at https://www.linkedin.com/in/alexander-köppe-269477160
Germany
Summary
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RockstarAlexander Köppe is a security-focused back-end engineer with 13 years of experience based in Germany, known for practical contributions to prominent open-source security tools like fail2ban and Ettercap. He specializes in robust IP address handling, IPv6 support, and DNS spoofing enhancements—work that improved protocol flexibility and hardened core enforcement logic in widely used security daemons. Comfortable refactoring legacy code, he blends careful test-driven improvements with pragmatic memory and filter management to make security features more reliable. Though primarily backend and security-oriented, his changes show an eye for cross-cutting concerns (address-family independence, DNS type breadth) that reduce attack surface while increasing interoperability.
13 years of coding experience
Github Skills (20)
ip-address10
python10
dns-resolver10
ip10
c-programming10
security10
dns10
ipv610
network-security10
resol10
security-hardening9
ipv49
network-protocol9
filtering8
regular-expression8
Programming languages (4)
Github contributions (5)
Ettercap/ettercap
Apr 2013 - Dec 2022
Ettercap Project
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:1 release, 7 reviews, 584 commits in 9 years 9 months
Contributions summary:Alexander was responsible for enhancing the security of the `ettercap` project, specifically within the DNS spoofing plugin. They implemented support for spoofing TXT and SRV DNS records, expanded the range of supported record types, and introduced a new function for handling IPv6 addresses during the process. Furthermore, the contributions involved refactoring and enhancing the code to make the DNS spoofing process more robust, including adding the ability to apply filters and use dedicated memory for certain operations.
ettercap
fail2ban/fail2ban
Feb 2016 - Dec 2018
Daemon to ban hosts that cause multiple authentication errors
Role in this project:Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:45 commits, 7 PRs, 82 comments in 2 years 10 months
Contributions summary:Alexander primarily focused on enhancing the `fail2ban` project's core functionality related to IP address handling and DNS resolution. Their contributions included refactoring the codebase to utilize an `IPAddr` class for more robust IP address management across both IPv4 and IPv6, improving the project's overall flexibility and security. The changes involved modifying existing code to ensure address family independence for ignore IP checks and DNS resolution. Further enhancements included adding tests and addressing small related issues.
pythonloganalyzeripsintrusion-detectionmonitoring
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