| Date | User | Challenge | Score |
| paul_rouviere | Finding Flags | 2 | |
| PARK_JOONSEOK | Salty | 20 | |
| PARK_JOONSEOK | Manyprime | 40 | |
| minwoo1006 | XOR Starter | 10 | |
| dbsgh5160 | Base64 | 10 | |
| inv | Logon Zero | 80 | |
| yaroslav | Round Keys | 20 | |
| iphqntom | Hash Stuffing | 50 | |
| shinee | Modular Arithmetic 1 | 20 | |
| dbsgh5160 | Hex | 5 | |
| sp1n0z4 | Passwords as Keys | 50 | |
| dbsgh5160 | ASCII | 5 | |
| kangmook | Base64 | 10 | |
| minwoo1006 | Bytes and Big Integers | 10 | |
| yaroslav | Structure of AES | 15 | |
| PARK_JOONSEOK | Monoprime | 30 | |
| 5unFl0werz | Base64 | 10 | |
| PARK_JOONSEOK | Factoring | 15 | |
| shinee | Extended GCD | 20 | |
| iphqntom | Collider | 50 | |
| minwoo1006 | Base64 | 10 | |
| PARK_JOONSEOK | RSA Signatures | 25 | |
| PARK_JOONSEOK | RSA Decryption | 20 | |
| minwoo1006 | Hex | 5 | |
| PARK_JOONSEOK | Private Keys | 20 | |
| minwoo1006 | ASCII | 5 | |
| see0 | Modes of Operation Starter | 15 | |
| PARK_JOONSEOK | Euler's Totient | 20 | |
| dbsgh5160 | Great Snakes | 3 | |
| minwoo1006 | Great Snakes | 3 | |
| PARK_JOONSEOK | Public Keys | 15 | |
| minwoo1006 | Finding Flags | 2 | |
| sp1n0z4 | Modes of Operation Starter | 15 | |
| iphqntom | Jack's Birthday Confusion | 30 | |
| QuachCuong | Endless Emails | 150 | |
| hakka52 | Script Kiddie | 70 | |
| dbsgh5160 | Finding Flags | 2 | |
| JoiceXu | Bytes and Big Integers | 10 | |
| CathyZhang | Bytes and Big Integers | 10 | |
| yaroslav | Resisting Bruteforce | 10 | |
| yaroslav | Keyed Permutations | 5 | |
| QuachCuong | Everything is Still Big | 100 | |
| yaroslav | Modular Binomials | 80 | |
| iphqntom | Jack's Birthday Hash | 20 | |
| usagi143 | Quadratic Residues | 25 | |
| hakka52 | Square Eyes | 35 | |
| hakka52 | Inferius Prime | 30 | |
| TheKY | Modes of Operation Starter | 15 | |
| Badre27 | Finding Flags | 2 | |
| aktweety | Great Snakes | 3 |
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