| Date | User | Challenge | Score |
| sqrtN | RSA Backdoor Viability | 175 | |
| meliodasexc | XOR Starter | 10 | |
| ThePirate42 | Modular Binomials | 80 | |
| Kimvo | Square Eyes | 35 | |
| Gelati09 | Base64 | 10 | |
| Gelati09 | Hex | 5 | |
| Lilinta | Modular Binomials | 80 | |
| ksenija | Generators of Groups | 20 | |
| Gelati09 | ASCII | 5 | |
| thaggs1066 | Endless Emails | 150 | |
| Priyanshu_0 | Modular Arithmetic 1 | 20 | |
| Lilinta | Adrien's Signs | 80 | |
| vivisect0r | CTRIME | 70 | |
| Gelati09 | Great Snakes | 3 | |
| ssbnn | ECB Oracle | 60 | |
| meliodasexc | Encoding Challenge | 40 | |
| Gelati09 | Finding Flags | 2 | |
| sine | Encoding Challenge | 40 | |
| shurayz | Nativity | 60 | |
| agomezmarti | Forbidden Fruit | 150 | |
| arwaWahid | Structure of AES | 15 | |
| Priyanshu_0 | Extended GCD | 20 | |
| rekiaz | Favourite byte | 20 | |
| Kimvo | Monoprime | 30 | |
| Priyanshu_0 | Greatest Common Divisor | 15 | |
| XHamdy | Resisting Bruteforce | 10 | |
| XHamdy | Keyed Permutations | 5 | |
| Lilinta | Successive Powers | 60 | |
| INA_ | Adrien's Signs | 80 | |
| markanie | Adrien's Signs | 80 | |
| rekiaz | XOR Properties | 15 | |
| Kimvo | Inferius Prime | 30 | |
| arwaWahid | Resisting Bruteforce | 10 | |
| dipsy | XOR Starter | 10 | |
| dipsy | Bytes and Big Integers | 10 | |
| arwaWahid | Keyed Permutations | 5 | |
| jd3boots | Euler's Totient | 20 | |
| kangmook | Bean Counter | 60 | |
| jd3boots | Public Keys | 15 | |
| asdkl | Greatest Common Divisor | 15 | |
| Neutr0nys | Cipher Mode Picker (HKCERT CTF) | 0 | |
| jd3boots | Modular Exponentiation | 10 | |
| cello | You either know, XOR you don't | 30 | |
| datasquirel | Confusion through Substitution | 25 | |
| SanMu | XOR Properties | 15 | |
| mholmes24 | Noise Free | 40 | |
| cello | Favourite byte | 20 | |
| MAZAKA | Bytes and Big Integers | 10 | |
| markanie | Chinese Remainder Theorem | 40 | |
| cello | XOR Properties | 15 |
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