| Date | User | Challenge | Score |
| oiji | Background Reading | 5 | |
| shokapikfort | Deriving Symmetric Keys | 40 | |
| chaiwon | Modulus Inutilis | 50 | |
| sxar | Modular Arithmetic 1 | 20 | |
| yololmao | Real Curve Crypto | 200 | |
| shokapikfort | Computing Shared Secrets | 30 | |
| thegoat2 | XOR Starter | 10 | |
| qthang | Favourite byte | 20 | |
| aslarin | XOR Starter | 10 | |
| ameliangrp | Base64 | 10 | |
| ameliangrp | Hex | 5 | |
| qthang | XOR Properties | 15 | |
| ameliangrp | ASCII | 5 | |
| aslarin | Bytes and Big Integers | 10 | |
| shokapikfort | Computing Public Values | 25 | |
| ameliangrp | Network Attacks | 5 | |
| shokapikfort | Generators of Groups | 20 | |
| gooter | You either know, XOR you don't | 30 | |
| bsvac | Ellipse Curve Cryptography | 125 | |
| ameliangrp | Great Snakes | 3 | |
| chaiwon | Salty | 20 | |
| shokapikfort | Working with Fields | 10 | |
| waltonj | ASCII | 5 | |
| shokapikfort | Modulus Inutilis | 50 | |
| gooter | Favourite byte | 20 | |
| lusty009 | Base64 | 10 | |
| ameliangrp | Finding Flags | 2 | |
| leeannaa13 | Great Snakes | 3 | |
| F0rhex | Quadratic Residues | 25 | |
| gooter | XOR Properties | 15 | |
| leeannaa13 | Finding Flags | 2 | |
| thegoat2 | Bytes and Big Integers | 10 | |
| Aparaititos | Modes of Operation Starter | 15 | |
| gooter | XOR Starter | 10 | |
| Me_Uhhh | ASCII | 5 | |
| gooter | Bytes and Big Integers | 10 | |
| ULUZ | XOR Starter | 10 | |
| waltonj | Great Snakes | 3 | |
| F0rhex | Modular Inverting | 25 | |
| Aparaititos | Bringing It All Together | 50 | |
| thegoat2 | Base64 | 10 | |
| Incognito | Confusion through Substitution | 25 | |
| wangfu | Computing Shared Secrets | 30 | |
| MatWoj99 | RSA Signatures | 25 | |
| airconditioner4 | Diffusion through Permutation | 30 | |
| qthang | XOR Starter | 10 | |
| gooter | Base64 | 10 | |
| kera | XOR Starter | 10 | |
| wangfu | Computing Public Values | 25 | |
| gooter | Hex | 5 |
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