| Date | User | Challenge | Score |
| _emmakaranja | Finding Flags | 2 | |
| runef | Modes of Operation Starter | 15 | |
| tsekunee | Finding Flags | 2 | |
| KillerJo | Favourite byte | 20 | |
| Khaliun | Finding Flags | 2 | |
| meldstorm | Merkle Trees | 25 | |
| Sneskovl | Modes of Operation Starter | 15 | |
| xaliunaa | Finding Flags | 2 | |
| munkhjin | Finding Flags | 2 | |
| kckckck3679 | Saying Hello | 20 | |
| saic | No Way JOSE | 20 | |
| Pandao | Finding Flags | 2 | |
| __incog__ | RSA or HMAC? | 35 | |
| kckckck3679 | TLS Handshake | 15 | |
| cryptokiwi | Transparency | 50 | |
| jkkwan27 | Prime and Prejudice | 200 | |
| Moi3032 | Favourite byte | 20 | |
| Sneskovl | Bringing It All Together | 50 | |
| kckckck3679 | Sharks on the Wire | 10 | |
| ngynmq | Digestive | 60 | |
| Moi3032 | XOR Properties | 15 | |
| crisis82 | Unencryptable | 125 | |
| RichardK | You either know, XOR you don't | 30 | |
| KillerJo | XOR Properties | 15 | |
| RichardK | Favourite byte | 20 | |
| kckckck3679 | Secure Protocols | 5 | |
| cryptokiwi | SSH Keys | 35 | |
| BOFG | Network Attacks | 5 | |
| SeifAhmed | Micro Transmissions | 120 | |
| Skarn | Signing Server | 60 | |
| dayanger765 | Keyed Permutations | 5 | |
| Moi3032 | XOR Starter | 10 | |
| __incog__ | JWT Secrets | 25 | |
| RichardK | XOR Properties | 15 | |
| JackOfBits | XOR Properties | 15 | |
| cryptokiwi | CERTainly not | 30 | |
| crisis82 | Gram Schmidt | 30 | |
| kckckck3679 | RSA or HMAC? Part 2 | 100 | |
| cryptokiwi | Privacy-Enhanced Mail? | 25 | |
| JackOfBits | XOR Starter | 10 | |
| dayanger765 | Modular Binomials | 80 | |
| RichardK | XOR Starter | 10 | |
| wellypiggy | Bytes and Big Integers | 10 | |
| Ngo9 | Adrien's Signs | 80 | |
| crisis82 | Size and Basis | 15 | |
| BOFG | Modular Arithmetic 2 | 20 | |
| JackOfBits | Bytes and Big Integers | 10 | |
| xer | ASCII | 5 | |
| crisis82 | Vectors | 10 | |
| ngynmq | Micro Transmissions | 120 |
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