| Date | User | Challenge | Score |
| ZhengzeLi | Modular Inverting | 25 | |
| GKM456 | Base64 | 10 | |
| ZhengzeLi | Modular Arithmetic 2 | 20 | |
| ZhengzeLi | Modular Arithmetic 1 | 20 | |
| Patonymous | Broken RSA | 100 | |
| ZhengzeLi | Extended GCD | 20 | |
| nisuu | Modes of Operation Starter | 15 | |
| ZhengzeLi | Greatest Common Divisor | 15 | |
| M4DD0C74 | No Way Back Home | 100 | |
| ZhengzeLi | You either know, XOR you don't | 30 | |
| Nurgleplex | Keyed Permutations | 5 | |
| ZhengzeLi | Favourite byte | 20 | |
| ZhengzeLi | XOR Properties | 15 | |
| Hassene | Hex | 5 | |
| youngCrypto | Successive Powers | 60 | |
| Isildur1 | Extended GCD | 20 | |
| ZhengzeLi | XOR Starter | 10 | |
| ZhengzeLi | Bytes and Big Integers | 10 | |
| mhd10bst | Greatest Common Divisor | 15 | |
| Hassene | ASCII | 5 | |
| ZhengzeLi | Base64 | 10 | |
| ZhengzeLi | Hex | 5 | |
| michkied | Transparency | 50 | |
| GKM456 | Hex | 5 | |
| ZhengzeLi | ASCII | 5 | |
| mhd10bst | You either know, XOR you don't | 30 | |
| Hassene | Great Snakes | 3 | |
| majs | Passwords as Keys | 50 | |
| Patonymous | Unencryptable | 125 | |
| mhd10bst | Favourite byte | 20 | |
| GKM456 | ASCII | 5 | |
| jstypulkowska | Adrien's Signs | 80 | |
| r4g4b | Base64 | 10 | |
| ZhengzeLi | Great Snakes | 3 | |
| ZhengzeLi | Finding Flags | 2 | |
| michkied | Unencryptable | 125 | |
| GKM456 | Great Snakes | 3 | |
| r4g4b | Hex | 5 | |
| SneakyFoxy | Real Eisenstein | 150 | |
| mhd10bst | XOR Properties | 15 | |
| Vanquishlynx | Modes of Operation Starter | 15 | |
| Patonymous | Modulus Inutilis | 50 | |
| gawol332 | Export-grade | 100 | |
| r4g4b | ASCII | 5 | |
| Patonymous | Salty | 20 | |
| r4g4b | Great Snakes | 3 | |
| Kammulus | Adrien's Signs | 80 | |
| r4g4b | Finding Flags | 2 | |
| Patonymous | Manyprime | 40 | |
| mhd10bst | XOR Starter | 10 |
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