2021年第二届赣网杯网络安全大赛MISC-Writeup
Posted 末 初
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decodemaster
decodemaster.docx的内容是wingding编码：https://lingojam.com/WingDing
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很像维吉尼亚，用在线站去爆破一下密钥：https://www.guballa.de/vigenere-solver
What is CTF and how to get started!
CTFs are one of my favorite hobbies. I love the feeling of solving a particularly difficult task and seeing all the puzzle pieces click together. I'd like this post to serve as an introduction to CTF for those in the dev.to community that may not know what it is.
So what is CTF?
CTF (Capture The Flag) is a kind of information security competition that challenges contestants to solve a variety of tasks ranging from a scavenger hunt on wikipedia to basic programming exercises, to hacking your way into a server to steal data. In these challenges, the contestant is usually asked to find a specific piece of text that may be hidden on the server or behind a webpage. This goal is called the flag, hence the name!
Like many competitions, the skill level for CTFs varies between the events. Some are targeted towards professionals with experience operating on cyber security teams. These typically offer a large cash reward and can be held at a specific physical location. Other events target the high school and college student range, sometimes offering monetary support for education to those that place highly in the competition!
CTFtime details the different types of CTF. To summarize, Jeopardy style CTFs provide a list of challenges and award points to individuals or teams that complete the challenges, groups with the most points wins. Attack/Defense style CTFs focus on either attacking an opponent's servers or defending one's own. These CTFs are typically aimed at those with more experience and are conducted at a specific physical location.
CTFs can be played as an individual or in teams so feel free to get your friends onboard!
I'd like to stress that CTFs are available to everyone. Many challenges do not require programming knowledge and are simply a matter of problem solving and creative thinking.
Challenge types
Jeopardy style CTFs challenges are typically divided into categories. I'll try to briefly cover the common ones.
Cryptography - Typically involves decrypting or encrypting a piece of data
Steganography - Tasked with finding information hidden in files or images
Binary - Reverse engineering or exploiting a binary file
Web - Exploiting web pages to find the flag
Pwn - Exploiting a server to find the flag
Please decode this:4%G#n+Wc?tpPU!b!Dv]RBfXx\\ZP\\n39iI+F;:SY,F!x9(B(3@E_(mwc7F2
Where do I start?
If I managed to pique your curiosity, I've compiled a list of resources that helped me get started learning. CTF veterans, feel free to add your own resources in the comments below!
得到：4%G#n+Wc?tpPU!b!Dv]RBfXx\\ZP\\n39iI+F;:SY,F!x9(B(3@E_(mwc7F2
经过多次base家族尝试发现是：base92->base58
flagYou_Are_Really_Decode_Master
gwb-misc-lovemath
Base32解一下I_Love_Math.txt
[(376, 38462.085), (485, 49579.895), (28, 2964.377), (390, 39888.567), (222, 22753.108), (388, 39685.235), (24, 2556.346), (204, 20916.088), (45, 4698.592), (9, 1026.251), (428, 43765.177), (334, 34176.356), (205, 21018.683), (218, 22344.21), (69, 7146.245), (347, 35503.166), (479, 48967.208), (213, 21834.244), (227, 23262.95), (460, 47029.989), (118, 12144.819), (491, 50192.035), (44, 4596.27), (241, 24690.668), (476, 48661.456), (18, 1944.416), (427, 43664.197), (214, 21936.838), (274, 28056.588), (272, 27853.2)]
[(85, 8348.621), (346, 33665.322), (101, 9900.75), (286, 27845.358), (490, 47634.336), (256, 24935.159), (499, 48507.783), (384, 37352.466), (314, 30561.655), (47, 4662.515), (279, 27166.774), (449, 43656.702), (415, 40358.941), (335, 32598.173), (445, 43269.738), (257, 25033.479), (56, 5535.53), (484, 47053.0), (24, 2431.123), (447, 43463.332), (252, 24547.35), (269, 26197.073), (375, 36478.885), (467, 45404.153), (299, 29106.661), (410, 39874.781), (111, 10870.232), (162, 15817.212), (473, 45985.348), (428, 41620.527)]
[(482, 59363.599), (493, 60717.612), (242, 29842.836), (403, 49645.494), (257, 31687.884), (418, 51490.659), (382, 47062.795), (172, 21232.594), (409, 50383.537), (37, 4627.411), (113, 13975.622), (283, 34886.502), (62, 7702.363), (438, 53951.295), (95, 11761.148), (164, 20248.214), (270, 33287.123), (60, 7456.365), (89, 11023.68), (165, 20371.405), (222, 27382.086), (416, 51244.099), (433, 53335.646), (422, 51983.683), (29, 3643.292), (466, 57395.086), (109, 13483.208), (200, 24677.075), (371, 45710.712), (325, 40052.51)]
[(214, 10596.501), (338, 16672.817), (383, 18878.996), (198, 9813.117), (149, 7411.18), (439, 21621.139), (12, 698.274), (30, 1580.109), (425, 20935.333), (372, 18338.869), (52, 2658.353), (282, 13928.514), (421, 20740.908), (242, 11968.381), (223, 11037.519), (46, 2364.361), (314, 15497.448), (225, 11135.62), (210, 10400.927), (168, 8342.544), (104, 5206.607), (175, 8685.26), (437, 21523.478), (55, 2805.311), (419, 20642.936), (79, 3981.11), (473, 23287.359), (207, 10253.953), (379, 18682.114), (498, 24512.699)]
[(444, 22697.484), (201, 10303.965), (442, 22594.985), (268, 13720.463), (215, 11018.358), (64, 3316.136), (99, 5101.527), (117, 6019.476), (42, 2194.3), (235, 12037.331), (447, 22850.954), (491, 25093.206), (400, 20452.699), (409, 20911.527), (303, 15505.555), (430, 21983.053), (166, 8518.432), (91, 4693.31), (197, 10099.772), (147, 7549.539), (115, 5917.528), (390, 19942.57), (396, 20250.15), (386, 19739.285), (144, 7396.758), (185, 9488.074), (308, 15761.079), (299, 15301.183), (453, 23156.869), (326, 16678.433)]
[(157, 17994.029), (466, 53219.713), (298, 34067.876), (336, 38400.176), (404, 46152.114), (35, 4085.249), (370, 42277.13), (74, 8531.099), (38, 4427.459), (356, 40680.902), (461, 52649.548), (103, 11837.351), (287, 32814.011), (153, 17537.147), (105, 12065.227), (165, 18905.831), (383, 43758.064), (14, 1691.277), (149, 17081.899), (48, 5567.135), (60, 6935.317), (183, 20958.053), (425, 48546.553), (124, 14231.309), (154, 17651.315), (305, 34865.077), (225, 25745.798), (22, 2603.436), (260, 29735.779), (268, 30648.491)]
[(35, 2921.193), (74, 6119.615), (366, 30063.851), (84, 6939.611), (445, 36541.644), (266, 21864.537), (44, 3659.23), (21, 1773.203), (281, 23094.394), (446, 36625.1), (134, 11039.599), (224, 18419.597), (125, 10301.272), (187, 15386.092), (27, 2265.144), (384, 31540.715), (312, 25636.875), (81, 6693.404), (256, 21043.915), (272, 22355.386), (413, 33917.33), (466, 38263.262), (10, 871.15), (322, 26455.254), (491, 40314.018), (285, 23422.235), (299, 24569.304), (314, 25799.903), (472, 38756.921), (207, 17025.119)]
[(18, 1909.09), (423, 43626.197), (443, 45686.428), (434, 44759.148), (227, 23436.716), (129, 13342.914), (6, 673.051), (30, 3145.382), (182, 18801.909), (53, 5514.395), (38, 3969.362), (306, 31573.971), (449, 46303.27), (342, 35281.657), (208, 21479.106), (58, 6029.494), (426, 43933.203), (31, 3248.286), (455, 46921.265), (46, 4793.37), (67, 6956.534), (436, 44964.671), (352, 36311.115), (39, 4072.332), (482, 49703.378), (36, 3763.208), (490, 50525.775), (404, 41667.513), (411, 42389.72), (87, 9016.124)]
[(466, 47119.357), (238, 24091.99), (378, 38231.425), (397, 40151.664), (62, 6315.361), (16, 1669.443), (495, 50048.255), (248, 25101.314), (97, 9850.418), (496, 50149.486), (250, 25303.773), (254, 25708.162), (151, 15304.476), (298, 30151.49), (39, 3992.359), (301, 30455.131), (487, 49240.674), (137, 13890.614), (170, 17223.704), (12, 1265.129), (306, 30959.984), (324, 32777.275), (354, 35808.118), (259, 26213.599), (61, 6214.064), (315, 31869.574), (419, 42373.779), (36, 3689.172), (56, 5709.441), (347, 35101.57)]
[(128, 10673.706), (410, 34080.113), (400, 33250.109), (495, 41134.303), (102, 8515.216), (388, 32253.575), (421, 34992.384), (126, 10507.612), (448, 37233.402), (230, 19139.667), (432, 35905.656), (343, 28519.819), (224, 18641.439), (16, 1377.078), (70, 5859.254), (188, 15653.68), (41, 3452.216), (262, 21795.981), (452, 37565.629), (496, 41218.974), (48, 4033.309), (19, 1626.453), (179, 14906.658), (490, 40720.602), (293, 24368.848), (17, 1460.317), (315, 26195.299), (351, 29182.612), (219, 18226.844), (192, 15985.401)]
[(366, 17679.993), (311, 15039.672), (144, 7022.587), (56, 2798.177), (40, 2030.32), (86, 4238.677), (393, 18974.814), (409, 19742.828), (266, 12878.464), (53, 2654.169), (356, 17199.18), (233, 11294.64), (70, 3470.511), (89, 4382.363), (80, 3950.705), (378, 18255.237), (139, 6782.707), (120, 5870.596), (31, 1598.134), (492, 23728.638), (453, 21856.637), (210, 10190.151), (47, 2366.403), (306, 14798.785), (235, 11390.721), (22, 1166.112), (471, 22719.415), (108, 5294.502), (413, 19936.025), (329, 15903.103)]
[(400, 38065.613), (406, 38635.921), (426, 40536.452), (228, 21725.303), (484, 46046.395), (297, 28280.548), (176, 16786.046), (316, 30085.821), (35, 3390.384), (315, 29990.94), (421, 40060.658), (448, 42627.029), (396, 37685.191), (458, 43575.818), (366, 34836.594), (474, 45095.324), (476, 45287.017), (36, 3485.245), (473, 45000.45), (22, 2155.411), (409, 38920.804), (362, 34455.627), (196, 18685.953), (450, 42816.42), (86, 8235.263), (266, 25335.452), (427, 40631.459), (423, 40252.254), (115, 10990.549), (180, 17165.868)]
[(399, 37977.029), (141, 13467.056), (491, 46716.435), (236, 22491.873), (415, 39497.438), (239, 22776.126), (378, 35981.953), (404, 38452.185), (20, 1971.333), (392, 37312.171), (348, 33131.705), (68, 6531.521), (116, 11091.687), (24, 2351.378), (377, 35886.753), (352, 33511.265), (186, 17741.408), (64, 6151.27), (238, 22681.308), (156, 14891.645), (77, 7386.51), (264, 25151.192), (311, 29616.833), (481, 45766.877), (229, 21826.112), (124, 11851.454), (204, 19452.046), (74, 7101.408), (101, 9666.573), (23, 2256.442)]
[(462, 22255.567), (404, 19472.985), (148, 7183.731), (116, 5647.385), (54, 2671.354), (129, 6271.643), (396, 19089.092), (104, 5071.365), (351, 16928.509), (263, 12704.488), (231, 11167.616), (203, 9824.242), (433, 20865.24), (380, 18319.847), (19, 991.333), (170, 8239.438), (61, 3007.183), (77, 3775.341), (193, 9343.796), (160, 7759.819), (113, 5503.85), (459, 22113.195), (472, 22735.985), (497, 23937.354), (121, 5887.589), (346, 16687.957), (332, 16016.091), (461, 22207.374), (145, 7039.67), (101, 4927.526)]
[(356, 35695.781), (323, 32396.312), (99, 9995.636), (274, 27495.776), (284, 28495.424), (37, 3795.292), (114, 11495.772), (381, 38195.254), (415, 41595.773), (45, 4595.278), (205, 20596.234), (418, 41896.749), (282, 28296.166), (228, 22896.214), (338, 33896.127), (84, 8495.355), (237, 23795.222), (414, 41495.335), (247, 24795.385), (133, 13395.59), (177, 17795.921), (481, 48195.587), (399, 39995.328), (435, 43595.973), (476, 47696.302), (347, 34797.091), (75, 7595.72), (224, 22495.502), (402, 40296.272), (139, 13995.28)]
[(334, 28161.025), (74, 6320.272), (244, 20600.842), (94, 8000.706), (174, 14720.587), (99, 8420.104), (484, 40761.531), (493, 41517.869), (447, 37652.765), (49, 4220.412), (499, 42021.241), (298, 25137.81), (79, 6740.362), (169, 14301.015), (439, 36981.933), (216, 18249.141), (476, 40090.247), (462, 38913.015), (413, 34798.204), (480, 40424.342), (491, 41349.055), (150, 12704.648), (433, 36477.326), (13, 1196.272), (400, 33705.346), (114, 9680.556), (127, 10772.474), (62, 5312.143), (295, 24884.463), (230, 19425.274)]
[(95, 4765.293), (138, 6872.432), (433, 21328.028), (432, 21280.189), (418, 20592.642), (344, 16967.601), (6, 404.037), (280, 13830.566), (175, 8685.604), (107, 5353.385), (487, 23975.472), (311, 15349.847), (473, 23288.902), (137, 6823.531), (427, 21033.375), (181, 8980.196), (453, 22308.892), (411, 20249.344), (328, 16183.891), (462, 22750.113), (407, 20054.791), (480, 23630.328), (31, 1629.26), (26, 1384.165), (170, 8440.836), (160, 7950.83), (58, 2952.176), (451, 22210.281), (43, 2217.416), (258, 12752.142)]
[(353, 36485.204), (305, 31540.781), (117, 12176.054), (130, 13515.348), (25, 2700.292), (120, 12485.819), (436, 45035.347), (254, 26287.979), (168, 17429.391), (484, 49979.295), (283, 29274.878), (112, 11661.515), (285, 29480.534), (173, 17944.669), (188, 19489.607), (371, 38339.416), (110, 11455.441), (49, 5172.438), (176, 18253.645), (72, 7541.458), (23, 2494.27), (262, 27111.683), (95, 9910.366), (175, 18150.397), (185, 19180.361), (133, 13824.115), (229, 23712.332), (27, 2906.355), (129, 13412.875), (381, 39369.318)]
画出来看看
import matplotlib.pyplot as plt
import numpy as np
import matplotlib as mpl
mpl.rcParams['font.family'] = 'sans-serif'
mpl.rcParams['font.sans-serif'] = 'NSimSun,Times New Roman'
with open('dataset.txt', 'r') as f:
lines = f.readlines()
for line in lines:
line = eval(line)
for tup in line:
x, y = tup[0], tup[1]
plt.plot(x, y, '.', color='black')
plt.xlabel('x')
plt.ylabel('y')
plt.title('Data')
plt.legend()
plt.show()
参考：https://a1eaiactaest.github.io/blog/writeups/mlwriteup.html
根据这里的处理逻辑，直接填进去稍微改一下即可
def smol_sqr(x,y):
n = len(x)
x_mean = sum(x)/len(x) # x with a dash
y_mean = sum(y)/len(y) # y with a dash
a_hat = [0,0]
for i in range(n):
sub_mean = x[i] - x_mean
y_sub_mean = y[i] * sub_mean
sub_mean_sqr = sub_mean**2
a_hat[0] += y_sub_mean
a_hat[1] += sub_mean_sqr
a_hat = a_hat[0]/a_hat[1]
b_hat = y_mean - x_mean * a_hat
return a_hat, b_hat
database = [[(376, 38462.085), (485, 49579.895), (28, 2964.377), (390, 39888.567), (222, 22753.108), (388, 39685.235), (24, 2556.346), (204, 20916.088), (45, 4698.592), (9, 1026.251), (428, 43765.177), (334, 34176.356), (205, 21018.683), (218, 22344.21), (69, 7146.245), (347, 35503.166), (479, 48967.208), (213, 21834.244), (227, 23262.95), (460, 47029.989), (118, 12144.819), (491, 50192.035), (44, 4596.27), (241, 24690.668), (476, 48661.456), (18, 1944.416), (427, 43664.197), (214, 21936.838), (274, 28056.588), (272, 27853.2)],
[(85, 8348.621), (346, 33665.322), (101, 9900.75), (286, 27845.358), (490, 47634.336), (256, 24935.159), (499, 48507.783), (384, 37352.466), (314, 30561.655), (47, 4662.515), (279, 27166.774), (449, 43656.702), (415, 40358.941), (335, 32598.173), (445, 43269.738), (257, 25033.479), (56, 5535.53), (484, 47053.0), (24, 2431.123), (447, 43463.332), (252, 24547.35), (269, 26197.073), (375, 36478.885), (467, 45404.153), (299, 29106.661), (410, 39874.781), (111, 10870.232), (162, 15817.212), (473, 45985.348), (428, 41620.527)],
[(482, 59363.599), (493, 60717.612), (242, 29842.836), (403, 49645.494), (257, 31687.884), (418, 51490.659), (382, 47062.795), (172, 21232.594), (409, 50383.537), (37, 4627.411), (113, 13975.622), (283, 34886.502), (62, 7702.363), (438, 53951.295), (95, 11761.148), (164, 20248.214), (270, 33287.123), (60, 7456.365), (89, 11023.68), (165, 20371.405), (222, 27382.086), (416, 51244.099), (433, 53335.646), (422, 51983.683), (29, 3643.292), (466, 57395.086), (109, 13483.208), (200, 24677.075), (371, 45710.712), (325, 40052.51)],
[(214, 10596.501), (338, 16672.817), (383, 18878.996), (198, 9813.117), (149, 7411.18), (439, 21621.139), (12, 698.274), (30, 1580.109), (425, 20935.333), (372, 18338.869), (52, 2658.353), (282, 13928.514), (421, 20740.908), (242, 11968.381), (223, 11037.519), (46, 2364.361), (314, 15497.448), (225, 11135.62), (210, 10400.927), (168, 8342.544), (104, 5206.607), (175, 8685.26), (437, 21523.478), (55, 2805.311), (419, 20642.936), (79, 3981.11), (473, 23287.359), (207, 10253.953), (379, 18682.114), (498, 24512.699)],
[(444, 22697.484), (201, 10303.965), (442, 22594.985), (268, 13720.463), (215, 11018.358), (64, 3316.136), (99, 5101.527), (117, 6019.476), (42, 2194.3), (235, 12037.331), (447, 22850.954), (491, 25093.206), (400, 20452.699), (409, 20911.527), (303, 15505.555), (430, 21983.053), (166, 8518.432), (91, 4693.31), (197, 10099.772), (147, 7549.539), (115, 5917.528), (390, 19942.57), (396, 20250.15), (386, 19739.285), (144, 7396.758), (185, 9488.074), (308, 15761.079), (299, 15301.183), (453, 23156.869), (326, 16678.433)],
[(157, 17994.029), (466, 53219.713), (298, 34067.876), (336, 38400.176), (404, 46152.114), (35, 4085.249), (370, 42277.13), (74, 8531.099), (38, 4427.459), (356, 40680.902), (461, 52649.548), (103, 11837.351), (287, 32814.011), (153, 17537.147), (105, 12065.227), (165, 18905.831), (383, 43758.064),以上是关于2021年第二届赣网杯网络安全大赛MISC-Writeup的主要内容，如果未能解决你的问题，请参考以下文章