| Date | User | Challenge | Score |
| SINDBAND | Favourite byte | 20 | |
| SINDBAND | XOR Properties | 15 | |
| fr1x3r | RSA Decryption | 20 | |
| sebastianbultaif | Finding Flags | 2 | |
| Carriedo | XOR Starter | 10 | |
| fr1x3r | Private Keys | 20 | |
| Enormka | Greatest Common Divisor | 15 | |
| phisher | Chinese Remainder Theorem | 40 | |
| JellyGames | Moving Problems | 150 | |
| rpadiou | Modular Square Root | 35 | |
| Bullring1567 | Base64 | 10 | |
| ahmedm3laa | Greatest Common Divisor | 15 | |
| Chafral | Encoding Challenge | 40 | |
| phisher | Modular Square Root | 35 | |
| Bullring1567 | Hex | 5 | |
| Chafral | Network Attacks | 5 | |
| Bullring1567 | ASCII | 5 | |
| AESpider | WOTS Up 2 | 90 | |
| vasileios_founta | Quadratic Residues | 25 | |
| vasileios_founta | Modular Inverting | 25 | |
| vasileios_founta | Modular Arithmetic 2 | 20 | |
| Floppy123 | Unencryptable | 125 | |
| vasileios_founta | Modular Arithmetic 1 | 20 | |
| vasileios_founta | Extended GCD | 20 | |
| vasileios_founta | Greatest Common Divisor | 15 | |
| vasileios_founta | You either know, XOR you don't | 30 | |
| vasileios_founta | Favourite byte | 20 | |
| Bullring1567 | Great Snakes | 3 | |
| Bullring1567 | Finding Flags | 2 | |
| vasileios_founta | XOR Properties | 15 | |
| acmo0 | Blinding Light | 120 | |
| SINDBAND | XOR Starter | 10 | |
| SINDBAND | Bytes and Big Integers | 10 | |
| agr | ECB Oracle | 60 | |
| acmo0 | Let's Decrypt | 80 | |
| ilkinA | Base64 | 10 | |
| Carriedo | Bytes and Big Integers | 10 | |
| ksenija | You either know, XOR you don't | 30 | |
| m0r1 | A Twisted Mind | 80 | |
| SINDBAND | Base64 | 10 | |
| ilkinA | Hex | 5 | |
| jkendall | Monoprime | 30 | |
| ilkinA | ASCII | 5 | |
| jkendall | Factoring | 15 | |
| ilkinA | Great Snakes | 3 | |
| learnercryptohac | Bean Counter | 60 | |
| Saber3105 | Curveball | 100 | |
| SINDBAND | Hex | 5 | |
| ksenija | Favourite byte | 20 | |
| Saber3105 | Efficient Exchange | 50 |
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