VladMetz's CTF #2 by VladMetz

Author:
VladMetz

Language:
C/C++

Upload:
2022-01-29 18:35

Download

Platform:
Windows

Difficulty:
3.5

Quality:
4.0

Arch:
x86

Downloads:
18

Size:
179.50 KB

Writeups:
0

Comments:
4

Description

The task is to find out the flag at which the message that you are a professional appears :D The main conditions do not change the program, good luck

Comments (4)
Writeups (0)

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ayyMike on 2022-02-01 00:12: The logic of the program seems to be as follows - esi = 2 * input[7] + input[0] * input[1] * (input[2] - input[2] * input[0] * input[6] * input[5] * input[4] * input[3] * input[9] * input[8] * input[8]); unsigned int calculated_value = esi / input[11] / input[12] / input[13] * input[2] * input[0] * input[1] calculated_value -= 148000000 if calculated_value = 1000000 fail() With this in mind, providing a specific set of characters will result in a calculated value

ayyMike on 2022-02-01 00:13: [Click to reveal]

VladMetz on 2022-02-01 10:26: ayyMike,Yes, you're good.

Slava on 2022-02-05 03:40: it boils down to if ( (unsigned int)(calc_value2 - 0x8D24D00) = 0xF4240 ) result_flag = "Invalid flag!"; I see that the calculation itself was already mentioned above.. a few more keys: ZXINzDNniEkOvS CevXPjscYmPOSh CevXPjscYmPOSh SePSvWbGRPoQpQ twciiDbxPPyvtW

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VladMetz's CTF #2 by VladMetz