24蓝桥杯网安线上赛-WEB,CRYPTO,MISC

WEB

爬虫协议

robots.txt
一路访问过去就行了

MISC

packet

查找flag

追踪流

base64解密即可

缺失的数据

给了字典，解密即可

看给的脚本lose.py，有加水印也有解水印代码。仿写
lose.py

class WaterMarkDWT:
    def __init__(self, origin: str, watermark: str, key: int, weight: list):
        self.key = key
        self.img = cv2.imread(origin)
        self.mark = cv2.imread(watermark)
        self.coef = weight
 

    def arnold(self, img):
        r, c = img.shape
        p = np.zeros((r, c), np.uint8)
 
        a, b = 1, 1
        for k in range(self.key):
            for i in range(r):
                for j in range(c):  
                    x = (i + b * j) % r
                    y = (a * i + (a * b + 1) * j) % c
                    p[x, y] = img[i, j]
        return p
 
    def deArnold(self, img):
        r, c = img.shape
        p = np.zeros((r, c), np.uint8)
 
        a, b = 1, 1
        for k in range(self.key):
            for i in range(r):
                for j in range(c): 
                        x = ((a * b + 1) * i - b * j) % r
                        y = (-a * i + j) % c
                    p[x, y] = img[i, j]
        return p
 

 
    def get(self, size: tuple = (1200, 1200), flag: int = None):