R3的题还是太顶了，题量大但只会签到（

Forensics

The R3 Pig Problem

打开可以看到很多tcp流，这些tcp流的时间戳存在规律

image-20250706142646509

提取出来，计算时间差，接近0.02的记为0，接近0.1的记为1

image-20250706142756381 
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def classify_time_diff(diff):
    if abs(diff - 0.02) < abs(diff - 0.1):
        return '0'
    else:
        return '1'
def process_file(filename):
    with open(filename, 'r') as f:
        lines = f.readlines()

    result = []

    i = 1 
    while i < len(lines)-1:
        try:
            current = float(lines[i+2].strip())
            previous = float(lines[i].strip())
            diff = current - previous
            bit = classify_time_diff(diff)
            result.append(bit)
        except ValueError:
            print(f"跳过无效行: 第 {i+1} 行")
        i += 2 

    return ''.join(result)

if __name__ == '__main__':
    input_file = 'output.txt' 
    binary_string = process_file(input_file)
    print(binary_string)

cyberchef转换一下

image-20250706143021382

Misc

一个签到一个签退就不写了（

R3GIRL In Paris

不难找到这个地方在巴黎的china town

image-20250706143424357
image-20250706143449758

在这些网站上都能找到艺术家名称

https://www.tripadvisor.fr/ShowUserReviews-g187147-d16881390-r661798726-Fresque_De_tous_pays_viendront_tes_enfants-Paris_Ile_de_France.html

https://www.trompe-l-oeil.info/Murspeints/details.php?image_id=9303

R3CTF{Eglise-Notre-Dame-de-Chine-Cyril-David}