香港網絡保安新生代奪旗挑戰賽 2021 (HKCERT CTF 2021)
This is a collection of all challenges (and writeups) in HKCERT CTF 2021
Challenges
| ID | Chinese name | Name | Score | Solves | Tags (Categories) |
|---|---|---|---|---|---|
| 1 | 玩咗先至瞓 | Sanity Check | 50 | 234 | #☆☆☆☆☆ |
| 2 | Freedom | Cipher Mode Picker | 100 | 21 | #crypto #★☆☆☆☆ |
| 4 | 所有遺失的東西 | All Missing | 150 | 27 | #pwn #★☆☆☆☆ |
| 5 | 留下來的人 | The Remaining One | 300 | 4 | #pwn #misc #★★★☆☆ |
| 6 | 今天我不想做嘢 | Let's Chill | 450 | 4 | #reverse #misc #★★★★☆ |
| 7 | 集合吧！地球保衛隊 | Sratslla SEA | 450 | 2 | #crypto #★★★★☆ |
| 10 | Ophiuchus | Ophiuchus | 500 | 2 | #web #★★★★★ |
| 11 | 無聲浪 | The Wave of Us | 50 | 152 | #forensics #☆☆☆☆☆ |
| 12 | 深夜浪漫 1 | babyURIi | 200 | 4 | #pwn #web #★★☆☆☆ |
| 15 | 幫緊你！幫緊你！ | Flag Checker™ | 250 | 3 | #pwn #★★☆☆☆ |
| 17 | 最難行的路 | The Hardest Path | 300 | 9 | #reverse #misc #★★★☆☆ |
| 20 | 開燈．熄燈 (熄燈版) | Jail of Blind | 300 | 4 | #pwn #★★★☆☆ |
| 22 | 小諧星 | A Joke Cipher | 50 | 88 | #crypto #☆☆☆☆☆ |
| 23 | 郵差叔叔送信純熟迅速送出 1 | Jack Botnet Service 1 | 300 | 12 | #forensics #★★★☆☆ |
| 24 | 郵差叔叔送信純熟迅速送出 2 | Jack Botnet Service 2 | 300 | 8 | #forensics #★★★☆☆ |
| 28 | 想改寫的事 | To Modify the Past | 50 | 54 | #pwn #☆☆☆☆☆ |
| 29 | 告別式 | Cool Down | 200 | 10 | #pwn #★★☆☆☆ |
| 30 | 世上唯一雙細胞 1 | Fortune Cookie 1 | 250 | 4 | #pwn #★★☆☆☆ |
| 31 | 世上唯一雙細胞 2 | Fortune Cookie 2 | 350 | 3 | #pwn #★★★☆☆ |
| 32 | 薛丁格的盒子 | Unobserved Box | 250 | 6 | #pwn #reverse #★★☆☆☆ |
| 35 | 千世書 | Mastermind | 500 | 0 | #pwn #★★★★★ |
| 36 | 逐步拾回自己 | Step by Step | 100 | 68 | #reverse #misc #★☆☆☆☆ |
| 37 | 暈暈陀陀 1 | CTF Tuning Master (Read) | 150 | 15 | #web #misc #★☆☆☆☆ |
| 38 | 點點心 | Steamed Meatball | 150 | 7 | #misc #★☆☆☆☆ |
| 39 | 選擇困難 | Difficult Choice | 400 | 5 | #forensics #★★★★☆ |
| 40 | 純孩兒 | babyXSS | 100 | 37 | #web #★☆☆☆☆ |
| 41 | 消失的人 | The Disappeared | 200 | 51 | #forensics #★★☆☆☆ |
| 43 | 理性與任性之間 | Shuffle | 50 | 60 | #reverse #☆☆☆☆☆ |
| 44 | 哥本哈根的另一個我 | Another VM in København | 300 | 2 | #reverse #★★★☆☆ |
| 45 | 一知半解 | Half-truth VM | 250 | 2 | #crypto #reverse #★★☆☆☆ |
| 46 | 要做更壞的事 | Make it worse VM | 500 | 0 | #pwn #reverse #★★★★★ |
| 49 | 漫漫碎 | Scattered | 100 | 16 | #reverse #★☆☆☆☆ |
| 51 | Old Fashioned | ↑←↓↑x | 250 | 11 | #reverse #★★☆☆☆ |
| 53 | 無門 | No Door 1 | 100 | 6 | #forensics #★☆☆☆☆ |
| 54 | 幻象 | No Door 2 | 200 | 14 | #forensics #★★☆☆☆ |
| 55 | 塵 | Positron | 400 | 3 | #crypto #pwn #reverse #web #misc #★★★★☆ |
| 56 | 因講了出來 | Because I Said It | 150 | 76 | #web #★☆☆☆☆ |
| 57 | 長話短說 | Key Backup Service 1 | 150 | 6 | #crypto #★☆☆☆☆ |
| 58 | Braceless | Key Backup Service 2 | 350 | 5 | #crypto #★★★☆☆ |
| 59 | 返鄕下耕田啦你 | easyheap | 250 | 5 | #pwn #★★☆☆☆ |
| 61 | 倒數 | babyre | 450 | 3 | #reverse #★★★★☆ |
| 62 | 角落生物 1 | Squirrel Community 1 | 50 | 176 | #web #☆☆☆☆☆ |
| 63 | 回到12歲 | scratch-tic-tac-toe | 200 | 86 | #misc #★★☆☆☆ |
| 64 | 荊棘海 | The Wilderness | 100 | 39 | #web #★☆☆☆☆ |
| 67 | 約定的夢幻島 | Sign In Please, Again | 500 | 2 | #crypto #★★★★★ |
| 70 | 樂園 | JQ Playground | 200 | 15 | #web #★★☆☆☆ |
| 72 | 中二病人 | A Junior Mathematician | 350 | 3 | #reverse #★★★☆☆ |
| 74 | 時間的囚犯 | Timebomb | 100 | 16 | #reverse #★☆☆☆☆ |
| 79 | FreeRider | Tenet: The Plagarism | 350 | 4 | #crypto #★★★☆☆ |
| 98 | 網絡安全隱患 | Infant Browser | 50 | 52 | #pwn #web #☆☆☆☆☆ |
| 111 | 神奇的糊塗魔藥 | Potion of Ciphermath | 450 | 1 | #crypto #misc #★★★★☆ |
| 123 | 差一些什麼? | babyUXSS | 100 | 7 | #web #★☆☆☆☆ |
| 60944 | 係咁先啦 | Feedback | 50 | 169 | #☆☆☆☆☆ |
| 6825524 | 深夜浪漫 2 | Return of babyURIi | 350 | 3 | #web #★★★☆☆ |
| 24397312 | 角落生物 2 | Squirrel Community 2 | 250 | 2 | #web #★★☆☆☆ |
| 33330996 | 暈暈陀陀 2 | CTF Tuning Master (Execute) | 300 | 3 | #web #★★★☆☆ |
4 Oct 10, 2022
1.4k Jan 01, 2023
121 Dec 30, 2022
17 Nov 10, 2022
75 Dec 23, 2022
148 Dec 09, 2022
1.3k Dec 26, 2022
62 Nov 28, 2022
21 Dec 15, 2022
62 Dec 27, 2022
72 Dec 20, 2022
288 Dec 31, 2022
66 Dec 16, 2022
147 Jan 07, 2023
1.9k Jan 06, 2023
3 Dec 26, 2022
934 Jan 08, 2023
3 Sep 19, 2022
4 Nov 07, 2022