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One post tagged with "RsaCtfTool"

RsaCtfTool is a tool used for cryptanalyzing RSA public keys that have been compromised or are weak, typically due to small exponents or moduli. It uses various attacks to recover the private key from the corresponding public key, often allowing access to sensitive data encrypted with the compromised RSA key. RSACtfTool can also be used to detect and exploit weaknesses in RSA-based cryptosystems, providing a means to bypass security measures designed around RSA encryption.

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HTB | Weak RSA | Write-Up

· 12 min read

Summary:​

We navigate the Hack The Box website, preparing for a challenge by preparing challenge files and setting up the RsaCtfTool. We use this tool to crack a weak public key, and then generate a private key. Next, we utilize RsaCtfTool to decrypt an encrypted flag, which ultimately leads us to submit the recovered flag as our solution.

Challenge Name: Weak RSA | Difficulty: Easy | Category: Crypto