Challenge list
Digital ForensicsLevel 4★★★★☆Decode Multi-Stage Steganography
Three stages of steganography are planted in `/challenge/cover.png` and `/challenge/notes.txt`. Each stage holds the…
Digital ForensicsLevel 4★★★★☆Recover Fragmented JPEG File
`/challenge/fragments/` holds 256-byte clusters (`clus_NNNN.bin`) recovered from the unallocated space of a memory…
CryptographyLevel 4★★★★☆Cryptanalysis - DSA Nonce Reuse Key Recovery
/challenge/signatures.json, created with fresh keys at every start, holds the DSA public parameters (p of 1024 bits, q…
CryptographyLevel 4★★★★☆Cryptanalysis - Wiener's Attack on RSA
An embedded-device team made the RSA private exponent d very small to speed up decryption. The public exponent e in…
CryptographyLevel 4★★★★☆Cryptanalysis - Recovering an LCG's Hidden Parameters
A service generated both session tokens and an encryption keystream from a linear congruential generator x_{k+1} =…
Digital ForensicsLevel 4★★★★☆Recover Damaged RAID5 Array
The RAID5 array `/dev/md0` (4 members) on the file server fs01 no longer assembles after the member sdd failed.…
Digital ForensicsLevel 4★★★★☆Reconstruct Attack Scenario from Multiple Logs
`/challenge/web.log`, `/challenge/auth.log` and `/challenge/db.log` record the same intrusion among a lot of…
Digital ForensicsLevel 5★★★★★Reconstruct Full APT Attack Stages
Four logs, `/challenge/edr_process.log`, `proxy_http.log`, `dns_queries.log` and `dlp_transfer.log`, hold an APT…
Digital ForensicsLevel 5★★★★★Crack BitLocker Encrypted Drive
Learn BitLocker recovery-key verification with a safe metadata fixture. bitlocker.img is not a real volume. Identify…
Digital ForensicsLevel 5★★★★★Extract Message Hidden in Bitcoin Transaction
The victim paid the ransom to the Bitcoin address `bc1qr4nsmw4r3pay7hzfx0d9cq3vkt8e6m5ljgs2ua`.…
Digital ForensicsLevel 5★★★★★Extract Secret Key from IoT Device Firmware
Analyze the update file `/home/ctfuser/evidence/firmware.bin` of the network camera KNC-CAM-2000 (do not connect to a…
LinuxLevel 5★★★★★Linux-eBPF Rootkit. Unmasking a Hidden Process
This challenge safely recreates eBPF-rootkit investigation as offline evidence analysis. Without loading eBPF, tell…
LinuxLevel 5★★★★★Linux-Kernel Exploit. Rewriting a Read-Only File with Dirty COW
This challenge models mmap, MAP_PRIVATE, and madvise—the ingredients used by Dirty COW (CVE-2016-5195)—as a safe,…
ProgrammingLevel 5★★★★★Advanced Python - Concurrent Event DAG Correlation
events.jsonl interleaves randomly ordered events from many services and traces. Starting from the marked auth.failed…
Network SecurityLevel 5★★★★★Network Analysis - IPv4 Overlapping Fragment Reassembly
The UDP datagram with IPv4 ID 0xbeef in fragments.pcap contains overlapping fragments that overwrite earlier bytes.…
Digital ForensicsLevel 5★★★★★Extract VM Information from Hypervisor Memory
Analyze the KVM host memory dump `/home/ctfuser/evidence/kvm_host.dump`. The guests are configured like AMD SEV, so…
ProgrammingLevel 5★★★★★Programming - APT Timeline Analysis
/challenge/events.jsonl combines security logs collected from several hosts and is regenerated with random data every…
ProgrammingLevel 5★★★★★Programming - AST-Based Vulnerability Detection
/challenge/corpus/*.py are Python sources for code review, regenerated with random data every time the container…
ProgrammingLevel 5★★★★★Programming - AWS Permission Analysis
/challenge/iam.json holds users, groups and policies and /challenge/s3_objects.json lists S3 objects (bucket, key,…
ProgrammingLevel 5★★★★★Programming - IoT Firmware Analysis
Analyze the network-camera firmware image firmware.bin, which is generated randomly at every start (it contains no…
ProgrammingLevel 5★★★★★Programming - Coverage-Guided Fuzzing
Analyze the coverage-guided fuzzer run record coverage-queue.jsonl, which is generated randomly at every start (the…
ProgrammingLevel 5★★★★★Programming - Zero-Click Message Analysis
messages.ndjson is the traffic log of a messaging app, built from random data at every start (in /challenge). Each…
ProgrammingLevel 5★★★★★Programming - Timing Attack Data Analysis
timings.csv is raw timing-attack measurements built from random data at every start (in /challenge). Against a server…
Digital ForensicsLevel 5★★★★★Detect Process Hollowing Attack
From the memory of a Windows host, the process list `process_list.txt` (the PEB view), the VAD list `vad_regions.txt`…