A Weak RSA Public Key refers to an RSA public key that has been intentionally compromised or created with insufficient security parameters, making it vulnerable to various attacks. A weak RSA public key can be used to decrypt sensitive data or compromise the security of a system, often due to a small exponent (e.g., 3), a small modulus (e.g., 65537), or a predictable sequence of keys. Using a weak RSA public key can render cryptographic protections ineffective and allow attackers to intercept and read encrypted communications.
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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