![]() Current Affairs – The Day’s Top News | GKSERIES May 12, 2023.Daily Quiz on Current Affairs by Gkseries – May 12, 2023.DISHA Scheme: UPSC Daily Important Topic | May 12, 2023.UPSC Daily Current Affairs Quiz: May 13, 2023.At 360 Learning, we believe in bringing about perfection with practice. Not only does this increase the knowledge of the subject, but it is also a wonderful way of increasing your concentration. The cryptography challenges used in previous RSM capture the flag events have covered a wide range of crypto puzzles and ciphers including foreign languages, staff ciphers, and book ciphers using web pages.One of the most remarkable things about practicing daily is the ability of your mind to become more focused on the subject you are studying. The answer is now fairly clear, “to catch them” the two KEYs stand out within the well known lyrics to the Pokemon theme song. I wanna be the very best like no one ever was KEY to catch them KEY is my real task to train them is my cause Parsed out by English words, we get (capitalization for effect): Iwannabetheverybestlikenooneeverwaskeytocatchthemkeyismyrealtasktotrainthemismycause Doing so yields yet another block of text: And so, applying random algorithms to the string will eventually lead one to use ROT-13. However, the text does not bare any recognizable signatures of known hash or encoding schemes. There are no direct hints that ROT-13 needs to be applied to the resulting text block. Vjnaanorgurirelorfgyvxrabbarrirejnfxrlgbpngpugurzxrlvfzlernygnfxgbgenvagurzvfzlpnhfr Re-blocking the text with the fence now deciphered, we get the following string: A Google search of “fence crypto” looks like this: Figure 1: Google Results for “fence crypto”īased on the Google results, the next step would be to put the provided text in a format suitable for deciphering: Figure 2: Text Arranged into the Rail Cipher Style However, our intent was for participants to take the title of the challenge as a hint and begin with the rail-fence. Technically, either cipher could be applied first. JANRUIEOFYXABRIENXLBNPGRXLFLRYNXBEVGRVZPHR Participants were presented with the following description for the 300 point Cryptography challenge (“On the Fence”): Let’s take a look at the challenge itself. When we reach the top rail, the message is written downwards again until the whole plaintext is written out. …the plaintext is written downwards and diagonally on successive “rails” of an imaginary fence, then moving up when we reach the bottom rail. In a fence cipher, as described on Wikipedia: ROT-13 is a straightforward substitution cipher in which letters in a message are replaced with the letter thirteen letters after it in the English alphabet. The 300 point challenge from our 2016 CTF event required the application of a fence cipher and ROT-13, two well known and documented ciphers. The example I’ll walk you through in this post is no exception. The category is meant to be a more approachable option for participants who favor puzzles instead of hacking or coding. Our Cryptography challenges have historically been paper-and-pencil options, requiring less raw, technical skill to complete.
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