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dCTF 2021 - This one is really basic | Crypto
This one is really basic The answer to life, the universe, and everything. Downloadable cipher.txt Solution The title of this challenge gave me a huge hint that the I need to decode the encrypted message with Base64. Given how huge the string is, I tried multiple attempts to see how...
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dCTF 2021 - Bad Apple | Steg
Bad Apple Someone stumbled upon this file in a secure server. What could it mean? Downloadable audio file Solution About halfway through the song, there will be weird static noise. Examining the audio file using Spectrogram, we can see that there is a hidden QR code ! Scanning the QR...
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dCTF 2021 - Julius' ancient script| Crypto
Julius’ ancient script I found this Ancient Roman papyrus. Could you decypher it for me? rq7t{7vH_rFH_vI6_pHH1_qI67} Solution This challenge was pretty straight forward. Using a ROT cipher to decrypt the message, I found the flag.