| Date | User | Challenge | Score |
| IbnuSaiber1 | Modular Inverting | 25 | |
| MIROZz | Hex | 5 | |
| ahmed0ayari | Base64 | 10 | |
| syahmiani1 | No Way Back Home | 100 | |
| Kran | Let's Decrypt | 80 | |
| LC | Hex | 5 | |
| syahmiani1 | Broken RSA | 100 | |
| syahmiani1 | Modular Binomials | 80 | |
| fenrosys | Dual Masters | 90 | |
| Belphegorr | Modular Arithmetic 1 | 20 | |
| syahmiani1 | Adrien's Signs | 80 | |
| la7lou7a | Keyed Permutations | 5 | |
| Tiseratil | Extended GCD | 20 | |
| Belphegorr | Extended GCD | 20 | |
| syahmiani1 | Common Ground | 75 | |
| syahmiani2 | Lazy CBC | 60 | |
| syahmiani2 | ECB Oracle | 60 | |
| fenrosys | Abelian SIDH | 90 | |
| Yaroman228 | Confusion through Substitution | 25 | |
| fenrosys | Better than Linear | 85 | |
| Belphegorr | Greatest Common Divisor | 15 | |
| syahmiani1 | Successive Powers | 60 | |
| syahmiani1 | Chinese Remainder Theorem | 40 | |
| syahmiani1 | Modular Square Root | 35 | |
| syahmiani1 | Legendre Symbol | 35 | |
| syahmiani1 | Quadratic Residues | 25 | |
| syahmiani2 | Flipping Cookie | 60 | |
| syahmiani2 | ECB CBC WTF | 55 | |
| syahmiani2 | Passwords as Keys | 50 | |
| Belphegorr | You either know, XOR you don't | 30 | |
| petroshacks | XOR Starter | 10 | |
| IbnuSaiber1 | Modular Arithmetic 2 | 20 | |
| WhAt | Bringing It All Together | 50 | |
| GLucy | Private Keys | 20 | |
| MRROOBT | You either know, XOR you don't | 30 | |
| KZOrP4Vl | Background Reading | 5 | |
| sfkaj | Favourite byte | 20 | |
| Yaroman228 | Round Keys | 20 | |
| Descartes0 | You either know, XOR you don't | 30 | |
| petroshacks | Bytes and Big Integers | 10 | |
| GLucy | Euler's Totient | 20 | |
| MRROOBT | Favourite byte | 20 | |
| syahmiani1 | Transparency | 50 | |
| Shinerone | ECB Oracle | 60 | |
| LC | ASCII | 5 | |
| syahmiani1 | SSH Keys | 35 | |
| IbnuSaiber1 | Modular Arithmetic 1 | 20 | |
| Descartes0 | Favourite byte | 20 | |
| Yaroman228 | Structure of AES | 15 | |
| MRROOBT | XOR Properties | 15 |
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