Basic mod2

104 372 110 436 262 173 354 393 351 297 241 86 262 359 256 441 124 154 165 165 219 288 42

Take each number mod 41 and find the modular inverse for the result. Then map to the following character set: 1-26 are the alphabet, 27-36 are the decimal digits, and 37 is an underscore. หา mod inverse 41 แล้ว map ข้อมูลตามนี้ ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_

หา inverse ทุกตัว

28, 14, 22, 30, 18, 32, 30, 12, 25, 37, 8, 31, 18, 4, 37, 4, 1, 4, 1, 1, 3, 1, 1

map ข้อมูล

abc = '0ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_'
cipher = [28, 14, 22, 30, 18, 32, 30, 12, 25, 37, 8, 31, 18, 4, 37, 4, 1, 4, 1, 1, 3, 1, 1]
for i in cipher:
    print(abc[i], end='')

1NV3R53LY_H4RD_DADAACAA

picoCTF{1NV3R53LY_H4RD_DADAACAA}