| Date | User | Challenge | Score |
| shin9x97 | You either know, XOR you don't | 30 | |
| shin9x97 | Favourite byte | 20 | |
| balaje_16 | Bytes and Big Integers | 10 | |
| shin9x97 | XOR Properties | 15 | |
| Kimkangsan | You either know, XOR you don't | 30 | |
| shin9x97 | XOR Starter | 10 | |
| shin9x97 | Encoding Challenge | 40 | |
| kangmook | You either know, XOR you don't | 30 | |
| PARK_JOONSEOK | Computing Public Values | 25 | |
| Kimkangsan | Favourite byte | 20 | |
| kangmook | Favourite byte | 20 | |
| paul_rouviere | You either know, XOR you don't | 30 | |
| PARK_JOONSEOK | Generators of Groups | 20 | |
| kangmook | XOR Properties | 15 | |
| paul_rouviere | Favourite byte | 20 | |
| paul_rouviere | XOR Properties | 15 | |
| arakata | Base64 | 10 | |
| arakata | Hex | 5 | |
| Kimkangsan | XOR Properties | 15 | |
| PARK_JOONSEOK | Working with Fields | 10 | |
| asanonepunch | Lemur XOR | 40 | |
| Kimkangsan | XOR Starter | 10 | |
| Kimkangsan | Bytes and Big Integers | 10 | |
| Kimkangsan | Base64 | 10 | |
| paul_rouviere | XOR Starter | 10 | |
| Kimkangsan | Hex | 5 | |
| yaroslav | Confusion through Substitution | 25 | |
| Kimkangsan | ASCII | 5 | |
| shin9x97 | Bytes and Big Integers | 10 | |
| PARK_JOONSEOK | Modulus Inutilis | 50 | |
| paul_rouviere | Bytes and Big Integers | 10 | |
| kangmook | XOR Starter | 10 | |
| shin9x97 | Base64 | 10 | |
| paul_rouviere | Base64 | 10 | |
| Kimkangsan | Great Snakes | 3 | |
| QuachCuong | Infinite Descent | 50 | |
| shin9x97 | Hex | 5 | |
| shin9x97 | ASCII | 5 | |
| Kimkangsan | Finding Flags | 2 | |
| shin9x97 | Network Attacks | 5 | |
| kangmook | Bytes and Big Integers | 10 | |
| shin9x97 | Great Snakes | 3 | |
| paul_rouviere | Hex | 5 | |
| paul_rouviere | ASCII | 5 | |
| TheKY | Passwords as Keys | 50 | |
| paul_rouviere | Great Snakes | 3 | |
| paul_rouviere | Finding Flags | 2 | |
| PARK_JOONSEOK | Salty | 20 | |
| PARK_JOONSEOK | Manyprime | 40 | |
| minwoo1006 | XOR Starter | 10 |
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