reverseProeasy

s5.out

spbctf

Task: 32-bit ELF serial validation crackme with recurrence relation. Solution: forward solve from known first character 'a' using input[i] = input[i-1] + i.

keygen cpp x86 not_stripped elf32 serial_validation recurrence_relation 32bit

static_analysisdisassemblyrecurrence_relationforward_solving

$ ls tags/ techniques/

keygen cpp x86 not_stripped elf32 serial_validation recurrence_relation 32bit

static_analysisdisassemblyrecurrence_relationforward_solving

Analysis

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

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