1st
Netanix CTF
team finish · 2026
Operator profile // KTM.NP
Hack to learn.
Learn to defend.
I’m d4rk.c1ph3r — a cybersecurity student, CTF player, and security-focused developer turning lab work into practical tools.
Open to internships & junior security roles
01 / Forensics02 / OSINT03 / Systems
4th
Hackastra Finals
national finish · 2026
3rd
PTNxOWASP CTF
100+ competitors · 2026
76%
Module Average
Coventry University
01
About me
The person behind the handle
Curiosity, converted into evidence.
I’m Mahendra Nath, a BSc (Hons) Ethical Hacking and Cybersecurity student at Coventry University, delivered through Softwarica College in Kathmandu.
Under the alias d4rk.c1ph3r, I compete with Sudo_Siblings, build security-focused software in Python and C, and publish practical write-ups from authorized labs. My strongest pull is toward digital forensics, OSINT, cryptography, and the systems work beneath secure applications.
Kathmandu, Nepal
BSc (Hons) · 2025—present
Available for internships & junior roles
02
Selected projects
Build log // public repositories
Built to understand. Designed to defend.
Showing 4 of 4 projects
OPS-01Security engineering
Cyber Dashboard
A private workspace for managing security learning, labs, findings, notes, tasks, and privacy-aware administration.
14 blueprints · 72 routes · 20 application tables
PythonFlaskMySQLDocker
- TOTP MFA
- RBAC
- Audit logs
- Secure exports
SYS-02Systems security
Linux Auth + Sandbox
Two C programs exploring privilege-separated authentication and supervision of complete Linux process trees.
SO_PEERCRED · seccomp · Landlock · cgroup-aware
CLinuxPOSIXIPC
- Privilege drop
- Peer identity
- Resource limits
- Isolation
BLU-03Detection research
State-based IDS
A finite-state detection model that maps user behavior into security states and raises risk as signals compound.
5 states · dynamic risk scoring · traffic simulation
PythonFSMDockerLogging
- Brute-force signals
- Geo anomalies
- Privilege events
LAB-04Authorized lab tooling
Reverse Shell Model
An educational client-server implementation for studying sockets, command processing, retries, and process control.
Standard library · persistent connection · cross-platform
PythonSocketsTCPSubprocess
- Lab-only scope
- Error recovery
- Connection handling
03
Areas of focus
Primary CTF disciplines
Follow the evidence.
ACTIVE_CHANNEL
SIG/FORENSICS
Forensics
Following artifacts, timelines, and metadata until a noisy incident becomes a defensible story.
Current practice / CTFs & authorized labs
Artifact analysisTimeline reasoningLog reviewSteganography
Explore the projects and field notes for examples of this work.
04
Training telemetry
TryHackMe // public profile
Proof of consistent practice.
Consistent hands-on practice, from security fundamentals to penetration testing and AI security.
Profile snapshot · updated 28 Oct 2026. Visit TryHackMe for the latest rankings.
View @D4rkC1ph3rWorld rank · Top 1%#9,859
Highest leagueSapphire
Highest streak246 days
Paths completed04
Capability score65/100
Completed learning paths
Jr Penetration Tester
Issued
AI Security
Issued
Pre Security (Legacy)
Issued
Pre Security
Issued
05
Competitive record
Team // Sudo_Siblings
Pressure tested.
Selected team placements · 2026
RankOperationAfter-action note
Pentester Nepal 13th Anniversary CTF
PTNxOWASP · August 2026
Sudo_Siblings placed third in an onsite field of more than 100 participants from across Nepal.
Hackastra CTF National Finals
Ethical HCK Community · 2026
Qualified in fifth position, advanced with Sudo_Siblings, and finished fourth in the national final.
Netanix CTF
Team Sudo_Siblings · April 2026
Won the competition across web, cryptography, forensics, reverse engineering, and pwn challenges.
On the CTFtime scoreboard.
Selected finishes below #30 with Sudo_Siblings.
PlaceEventTeam score
gaslightCTF 2026
Online event · 393 teams
11,054 CTF points
Thryve CTF 2026
Online event · 400 teams
6,570 CTF points
Kali Team - CTF 26
Online event · 645 teams
2,650 CTF points
Hackअस्त्र
2026 online qualifiers · 230 teams
7,582 CTF points
06
Technical writing
Published on Medium
Field notes from the lab.
NOTE / 01NOTE / 02
TryHackMe CryptoCabana Write up| Hacker Holiday Day 9
Aug 04, 2026 · tryhackme · cloud-security
TryHackMe Write-up: Cache Me Outside
Jun 11, 2026 · tryhackme-walkthrough · ethical-hacking
Latest stories from the public Medium feed. Refreshed hourly.
07
Academic base
Current study
BSc (Hons) Ethical Hacking and Cybersecurity
Coventry University · delivered at Softwarica College of IT & E-Commerce
RELEASED MODULE AVG.76%
Selected marks include Programming 85%, Internet & Web Technologies 83%, and Operating Systems 80%.
08
Get in touch
Open to internships, junior roles & CTF collaboration
Let’s work on something worthwhile.
I’m looking for opportunities to learn, contribute, and build useful security tools. Get in touch about a role, a project, or your next CTF.
Click to copy the email address.