Capture The Flag
One flag per challenge. Download the artifact, dig in, and submit what you find. Every solve adds to your total points.
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Cryptography
During a routine investigation, your team intercepted a short digital radio transmission sent between two unknown systems. The message wasn't encrypted using any advanced algorithm—it was simply converted into binary before transmission. Your task is to analyze the intercepted data, determine the encoding method, and recover the hidden flag.
Cryptography
The final transmission from the Mars rover was received just before communication was lost. Unfortunately, the message appears scrambled. Mission engineers believe the rover's communication system used a very old encoding method where every letter was shifted by the same amount before transmission. Can you recover the original message and retrieve the flag? Every letter moved just a little to the left.
Cryptography
A system administrator stored an internal access note using a simple substitution cipher. During a security assessment, you recovered the encrypted message, but the key used for encryption was not included. The administrator relied on a Caesar Cipher, assuming that shifting each letter by a few positions would be enough to protect the information. Analyze the encrypted text, determine the correct shift value, and recover the hidden flag.
Cryptography
A backup server from a compromised bank contained a strange internal note. The note doesn't look encrypted. It just looks... different. It's still just letters — there are just a few more of them, and some equal signs at the end. Can you recover what the vault was hiding?
Cryptography
A cached thread from an underground city forum was recovered after the network went offline. Most of it is completely uninteresting — users arguing about food prices, power cuts, and broken vending machines. But the archive is slightly larger than it should be. Something is hidden in plain sight, but you'll never see it.
Cryptography
Digital archivists recovered only part of a technology forum that disappeared in 2006. One discussion mentions Project Oracle, a mysterious internal project that supposedly never existed. The thread looks ordinary...