cryptoProhard

hütchenspiel

hxp_39c3

Task: hxp Crypto "hütchenspiel" — shell game. Solution: German shell game cipher, probability-based decryption.

linear_algebra signature_forgery key_exchange matrix_algebra aes-gcm

Zero-signature forgery via compose(a, 0) = 0Linear operator recovery over GF(p)Solving 49x49 linear system for matrix algebra basisShared secret computation without private exponents

$ ls tags/ techniques/

linear_algebra signature_forgery key_exchange matrix_algebra aes-gcm

Zero-signature forgery via compose(a, 0) = 0Linear operator recovery over GF(p)Solving 49x49 linear system for matrix algebra basisShared secret computation without private exponents

Analysis

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$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

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