john_pollard

Problem

Sometimes RSA certificates are breakable

• Certificate

Solution

1. Decode the RSA certificate at https://8gwifi.org/PemParserFunctions.jsp or https://www.sslchecker.com/certdecoder

2. Find the modulus value in the decoded certificate: Modulus: 4966306421059967 (0x11a4d45212b17f)

3. Use Yafu to factor into p and q: factor(0x11a4d45212b17f)

Flag

picoCTF{73176001,67867967}