Here is an RSA public key and a message that's been encrypted with it.

-----BEGIN PUBLIC KEY-----
MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAKzl5VggSXb/Jm2oqkPeRQwtpmGlLnJT
Nre4LKx3VUljtLzYWj4xoG+aHBouwJT7DyeibpasCH8Yderr4zIGTNUCAwEAAQ==
-----END PUBLIC KEY-----

message:
0xf5ed9da29d8d260f22657e091f34eb930bc42f26f1e023f863ba13bee39071d1ea988ca62b9ad59d4f234fa7d682e22ce3194bbe5b801df3bd976db06b944da

Luckily the recipient was using their random number generator incorrectly resulting in low entropy prime number generation. Here is another public key the recipient generated around the same time.

-----BEGIN PUBLIC KEY-----
MF0wDQYJKoZIhvcNAQEBBQADTAAwSQJCAPsrpwx56OTlKtGAWn24bo5HUg3xYtnz
nTj1X/8Hq7pLYNIVE57Yxoyr3zTOOBJufgTNzdKS0Rc5Ti4zZUkCkQvpAgMBAAE=
-----END PUBLIC KEY-----

Submit the secret message in lowercase hex. Some light reading material

Solution