Hey 0x00ers!
If you took part in our latest CTF (December 2018), then many of you will remember the CTF challenge that plagued everybody. It was a base62 encoded string with “-” placed randomly in the string to create a flag. This took nearly 18 hours to crack by many people.
In order to help you guys get some practice, I’m going to be releasing some challenges along the way until the next CTF, and hopefully, teach you some new little tricks that CTF developers will use to trip you up.
If you follow me on twitter, you’ll know I shared a link to this https://gchq.github.io/CyberChef/, a valuable tool in solving these sort of challenges. I would recommend playing with it a bit as it can be super useful than trying to mess with multiple online tools. You can also build ‘recipes’ which slot in together which is really nice.
I wish you luck! If you find the answer, please enclose it using the spoiler tags when you reply.
Difficulty: Intermediate
-----BEGIN CERTIFICATE-----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WVdkelJGWjNaMHhQWkVaNlNYVmlWWFExYTJsTFMwNHhXbmRLWTJoMk5GUlNOVkJw
VEhoR1dUTldUVlp4WVVWek5FaFNValpSVEd0eWJGZHlaak5NVTI1bFJHUjNhV0pP
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Y0hwTlpIcElTV04xUW5rM1pYazRVa1J1TmtGMVRUVlVOVWhHZWpCbVpVdENOemMw
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Y2xSUVYwNDVjbGhqUkhSQmFISkhPRXhrYm5sMlVVaEpTMlprTldGQ05HTk9TV28w
ZG5WNFUwa3dXRlE1WWpWRVRrbEVNMFp4TTFwaVltbExlVVJFYlV4cVNHMVdRVXBv
ZDFWeVZsUXhXVGs9
-----END CERTIFICATE-----