$ cat writeup.md…
$ cat writeup.md…
ringzer0ctf
Task: given a 1024-bit PKCS#1 RSA private key PEM, recover the matching public key. Solution: the private key already embeds n and e, so derive the public key directly with `openssl rsa -pubout`; verify by matching the MD5 fingerprint of the single-line base64 body.
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$sign in$ grep --similar