asepharyana
7a6e717c28
- Deleted all previous dummy docs (defcon-quals-2024, infra/cloudflare-525, debugging/websocket-timeout, template, docs/*, notes/*, research/*) - Added 14 Gemastik warmup writeups covering encoding, stego, web, pwn, crypto - ch13: RSA small factors; ch14: RSA special integers via paper-search (GCD with paper appendix primes) - All flags recovered and documented with solution methods
25 lines
507 B
Markdown
25 lines
507 B
Markdown
---
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title: "Behind the Picture — PNG Strings"
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event: "GEMASTIK 2026 Warmup"
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challenge: "Behind the Picture"
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category: "forensics"
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points: 500
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difficulty: "easy"
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flag: "GEMASTIK19{c4t_g4mbar_ada_flag}"
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---
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# Behind the Picture (500 pts) — Steganografi / PNG
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**File:** `kucing.png` (cat image)
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Flag disisipkan sebagai string di dalam file PNG (bisa dilihat dengan `strings`):
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```bash
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strings kucing.png | grep GEMASTIK
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# GEMASTIK19{c4t_g4mbar_ada_flag}
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```
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## Flag
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`GEMASTIK19{c4t_g4mbar_ada_flag}`
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