| Date | User | Challenge | Score |
| yuliyost | Script Kiddie | 70 | |
| 2976942164 | Successive Powers | 60 | |
| 2976942164 | Chinese Remainder Theorem | 40 | |
| ForJ | Chinese Remainder Theorem | 40 | |
| 2976942164 | Quadratic Residues | 25 | |
| 2976942164 | Resisting Bruteforce | 10 | |
| nahitango | Curves and Logs | 40 | |
| Nietzsche | Base64 | 10 | |
| laodidi | Jack's Birthday Confusion | 30 | |
| laodidi | Jack's Birthday Hash | 20 | |
| laodidi | Point Negation | 10 | |
| laodidi | Generators of Groups | 20 | |
| laodidi | Working with Fields | 10 | |
| laodidi | Public Keys | 15 | |
| laodidi | Modular Exponentiation | 10 | |
| laodidi | Successive Powers | 60 | |
| laodidi | Dancing Queen | 120 | |
| laodidi | Stream of Consciousness | 80 | |
| laodidi | Logon Zero | 80 | |
| laodidi | CTRIME | 70 | |
| laodidi | Bean Counter | 60 | |
| laodidi | Symmetry | 50 | |
| laodidi | Triple DES | 60 | |
| laodidi | Lazy CBC | 60 | |
| laodidi | Flipping Cookie | 60 | |
| laodidi | ECB Oracle | 60 | |
| laodidi | ECB CBC WTF | 55 | |
| laodidi | Passwords as Keys | 50 | |
| laodidi | Modes of Operation Starter | 15 | |
| laodidi | Bringing It All Together | 50 | |
| laodidi | Diffusion through Permutation | 30 | |
| laodidi | Confusion through Substitution | 25 | |
| laodidi | Round Keys | 20 | |
| Nietzsche | Hex | 5 | |
| laodidi | Structure of AES | 15 | |
| emanu93 | Diffusion through Permutation | 30 | |
| Nietzsche | ASCII | 5 | |
| laodidi | Lemur XOR | 40 | |
| nahitango | Scalar Multiplication | 35 | |
| laodidi | Encoding Challenge | 40 | |
| laodidi | Network Attacks | 5 | |
| crypto_sis | Modular Binomials | 80 | |
| spartan8806 | Nativity | 60 | |
| spartan8806 | Missing Modulus | 80 | |
| hanahiennguyen | Resisting Bruteforce | 10 | |
| ayal | Finding Flags | 2 | |
| crypto_sis | Adrien's Signs | 80 | |
| Nietzsche | Great Snakes | 3 | |
| hanahiennguyen | Keyed Permutations | 5 | |
| Mikayn | Passwords as Keys | 50 |
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