32 lines
1.5 KiB
Markdown
32 lines
1.5 KiB
Markdown
# Examples — real CTF challenges solved with this toolkit
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Every example is reproducible offline (no live server, no sage) and uses
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`lib/crypto_utils.py` / `lib/net.py` where applicable. Solved by distilling
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patterns from the public `p4-team/ctf` archive.
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| Challenge | Event | Category | Vuln | Flag |
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|-----------|-------|----------|------|------|
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| `ps_and_qs` | SECCON 2017 Quals | Crypto | Two RSA keys share a prime (`gcd(n1,n2)=p`) | `SECCON{1234567890ABCDEF}` |
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| `lost_modulus` | HITCON 2019 Quals | Crypto | RSA leaks `e,d,iqmp,ipmq` but not `n` — recover `n` | `hitcon{1t_is_50_easy_t0_find_th3_modulus_back@@!!@!@!@@!}` |
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| `a2s` | Pwn2Win 2021 | Crypto | 2-round reduced AES — differential attack recovers key | `CTF-BR{bu7_1f_7h0u6h7_c0rrup75_l4n6u463,_l4n6u463_c4n_4l50_c0rrup7_7h0u6h7}` |
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| `russian_threesome` | Hack.lu 2020 | RE/Misc | Inverse-permutation fixed-point on a drum dump (CP1251) | `Кто хочет много знать, тому мало спать.` |
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| `mask` | TokyoWesterns 2020 | Misc | Host bits of `IP/mask` list → base64 → flag | `TWCTF{Are-you-using-a-mask?}` |
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## Run them
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```bash
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cd /home/code/ctfkit
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# crypto — self contained
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python3 examples/ps_and_qs.py
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python3 examples/lost_modulus/solve.py
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# a2s — runs the differential attack then extracts the flag
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cd examples/a2s && python3 solve.py && cd ../..
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# russian_threesome — permutation fixed point
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python3 examples/russian_threesome/solve.py
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# mask — IP/mask host bits -> base64
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python3 examples/mask/solve.py
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```
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