$ cat writeup.md…
$ cat writeup.md…
ringzer0ctf
Task: a web page serves a salted SHA-1 digest plus a per-request 32-byte salt and demands the preimage within 3 seconds via GET ?r=. Solution: fetch digest and salt over a persistent requests.Session, brute-force a small integer i against sha1(str(i)+salt), and submit the decimal string back in the same session.
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