| Date | User | Challenge | Score |
| Morticiaxx | Euler's Totient | 20 | |
| xinglin | Modular Arithmetic 2 | 20 | |
| xinglin | Modular Arithmetic 1 | 20 | |
| Morticiaxx | Public Keys | 15 | |
| Denis000 | Export-grade | 100 | |
| Denis000 | Parameter Injection | 60 | |
| Reginleif86 | Bytes and Big Integers | 10 | |
| Denis000 | Deriving Symmetric Keys | 40 | |
| Morticiaxx | Modular Exponentiation | 10 | |
| adssafsad | Greatest Common Divisor | 15 | |
| Reginleif86 | Base64 | 10 | |
| Denis000 | Computing Shared Secrets | 30 | |
| Denis000 | Computing Public Values | 25 | |
| cryptoBytes | Base64 | 10 | |
| ii76 | Confusion through Substitution | 25 | |
| Ali2006 | Hex | 5 | |
| nwal | Diffusion through Permutation | 30 | |
| Denis000 | Generators of Groups | 20 | |
| JakobKjellberg02 | Structure of AES | 15 | |
| Denis000 | Working with Fields | 10 | |
| ii76 | Round Keys | 20 | |
| Ali2006 | ASCII | 5 | |
| Denis000 | Modulus Inutilis | 50 | |
| djamilyya | Favourite byte | 20 | |
| Denis000 | Salty | 20 | |
| Reginleif86 | Hex | 5 | |
| Denis000 | Manyprime | 40 | |
| Reginleif86 | ASCII | 5 | |
| Denis000 | Monoprime | 30 | |
| Reginleif86 | Network Attacks | 5 | |
| Ali2006 | Great Snakes | 3 | |
| JakobKjellberg02 | Resisting Bruteforce | 10 | |
| ccaadence | Base64 | 10 | |
| Ali2006 | Finding Flags | 2 | |
| Denis000 | Factoring | 15 | |
| HARE | Greatest Common Divisor | 15 | |
| ccaadence | Hex | 5 | |
| michalhejd | Hex | 5 | |
| Reginleif86 | Great Snakes | 3 | |
| Denis000 | RSA Signatures | 25 | |
| JakobKjellberg02 | Keyed Permutations | 5 | |
| muzakerkhan | Modular Binomials | 80 | |
| Denis000 | RSA Decryption | 20 | |
| Reginleif86 | Finding Flags | 2 | |
| Denis000 | Private Keys | 20 | |
| nwal | Confusion through Substitution | 25 | |
| Denis000 | Euler's Totient | 20 | |
| michalhejd | ASCII | 5 | |
| Denis000 | Public Keys | 15 | |
| Haxan | Adrien's Signs | 80 |
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