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TJUCTF新生賽-AI安全專欄write up

2022-01-25 07:18:20 其他

以下題目為我本次為天津大學ctf新生賽出的AI安全專欄中的所有題目,所有代碼僅限學習交流,請勿用于非法活動或商業用途,若需要ctf比賽出題,可以通過QQ 2478953474聯系我

1. 簽到題

非常簡單的簽到題,不過其可能會對于其他題目有幫助哦
本題只有如下一個源代碼作為附件
from my_flags import flag1

def getdict1(mydict,ans,flag):
    pre_index=23
    for i in range(1,len(flag)):
        now_index=ans.find(flag[i])
        mydict[pre_index]=now_index
        pre_index=now_index
    mydict[25]=12
    return mydict

ans='t_3Lhalemsc!{1-5oHET+wgfi}'
flag_mapping={}
flag_dict=getdict1(flag_mapping,ans,flag1)
print(flag_dict)

#print(flag_dict)={8: 18, 11: 25, 20: 0, 17: 7, 12: 19, 15: 1, 19: 4, 22: 12, 7: 14, 9: 20, 13: 9, 25: 12, 3: 10,
# 21: 2, 0: 17, 1: 13, 2: 3, 4: 24, 6: 5, 18: 11, 16: 8, 10: 16, 14: 21, 24: 15, 23: 6, 5: 22}
鏈接:https://pan.baidu.com/s/142Ollb4lI7jRGDnRrvBtfQ 
提取碼:zd0g 
--來自百度網盤超級會員V6的分享

這題直接就是將ans還原為flag,在最底下給出了二者的字串下標的映射關系,直接還原即可得到flag

flag{Thi5_1s+tHe-w3LcomE!}

2. DNN的本質

DNN是一種常用的簡單神經網路,你可以從它中發現flag嗎?
from my_flags import flag2

import torch
from torch import nn, optim
# Can you recover the flag using the 'ans' and 'DNN'?
class DNN(nn.Module):
    def __init__(self):
        super(DNN,self).__init__()
        self.fc1=nn.Linear(22,22)

    def forward(self,x):
        x=self.fc1(x)
        return x

def getdict2(mydict,ans,flag):
    pre_char='f'
    for i in range(1,len(flag)):
        now_char=flag[i]
        mydict[pre_char]=now_char
        pre_char=now_char
    mydict['d']='}'
    return mydict

ans='al8kc_f3}d50A{6e7x1gi2'
# Generate the feature x for each character in 'ans'
feature_dict={}
flist=[]
for i in range(len(ans)):
    # The following two lines show how I generate the feature
    # feature like this
    # [0.6, 0.2, 0.2, ..., 0.2]
    # [0.2, 0.6, 0.2, ..., 0.2]
    tmplist=[0.2]*len(ans)
    tmplist[i]+=0.4

    flist.append(tmplist)
    feature_dict[ans[i]]=tmplist
# Generate the train database
train_data=[]
ans_to_flag2_dict={}
ans_to_flag2_dict=getdict2(ans_to_flag2_dict,ans,flag2)
keys=list(ans_to_flag2_dict)
for i in keys:
    print(i,'----------->',ans_to_flag2_dict[i])
    train_data.append((feature_dict[i],feature_dict[ans_to_flag2_dict[i]]))
# Train the DNN
epoch=1000
iter=len(train_data)
dnn=DNN()
dnn.train()
lr=0.2
opt=optim.SGD(dnn.parameters(),lr)
criterion = nn.L1Loss()
for i in range(epoch):
    for j in range(iter):
        x=torch.tensor(train_data[j][0],dtype=torch.float)
        y=torch.tensor(train_data[j][1],dtype=torch.float)
        _y=dnn.forward(x)
        loss = criterion(_y,y)
        print(loss.data)
        loss.backward()
        opt.step()
        opt.zero_grad()

# Save the model
dnn.eval()
savepath='./dnn.pt'
torch.save(dnn,savepath)
鏈接:https://pan.baidu.com/s/1cNfz81II2xCqOIhuNjRqJA 
提取碼:pv62 
--來自百度網盤超級會員V6的分享

有了簽到題的提示,這題難度并不是很高,我在這題中提供了一個訓練好的簡單DNN,DNN可以學習到一個特征空間到另一個特征空間的映射關系,其實在本題中的DNN模型作用和簽到題中的flag_dict是一樣的,提供了ans到flag的映射關系,
在這里插入圖片描述

根據題目的"feature like this"的提示可知,輸入中數值最大的下標代表ans中下標對應的字符而輸出中數值最大的下標代表flag,由此可以得到一個ans到flag的映射,因此可以直接載入模型,使用附件中提供的特征生成方法逐個生成ans的特征,送入DNN中得到其對應的字符,exp如下

import torch
from torch import nn

class DNN(nn.Module):
    def __init__(self):
        super(DNN,self).__init__()
        self.fc1=nn.Linear(22,22)

    def forward(self,x):
        x=self.fc1(x)
        return x

ans='al8kc_f3}d50A{6e7x1gi2'
flist=[]
for i in range(len(ans)):
    # The following two lines show how I generate the feature
    # feature like this
    # [0.6, 0.2, 0.2, ..., 0.2]
    # [0.2, 0.6, 0.2, ..., 0.2]
    tmplist=[0.2]*len(ans)
    tmplist[i]+=0.4

    flist.append(tmplist)

dnn=torch.load('./database/dnn.pt')
dnn.eval()

for i in range(len(flist)):
    print(flist[i])
    x=torch.tensor(flist[i],dtype=torch.float)
    y=dnn.forward(x).data.tolist()
    maxnum=-1.0
    loc=-1
    for j in range(len(y)):
        if(y[j]>maxnum):
            maxnum=y[j]
            loc=j
    print(ans[i],'---->',ans[loc])
    #print(y)
    print('-------------------------------------------------------------------------')
flag{A1ice_0x3k52876d}

3. 模型里的flag1

flag在flag.pt里面,你能找到它嗎?
提示:Netron是個好東西
鏈接:https://pan.baidu.com/s/1n5vSExPmZyh2ptxtFDQbKQ 
提取碼:qhze 
--來自百度網盤超級會員V6的分享

根據提示下載Netron軟體,這個軟體可以可視化模型的結構,發現有很多全連接層的名字是base64編碼的,逐個嘗試就可以得到flag
在這里插入圖片描述

flag{0xdf2a78e_you_are_right!^v^}

4. 模型里的flag2

flag在flag_hard.pt里面,你能找到它嗎?
提示:Netron好用但不是萬能的
鏈接:https://pan.baidu.com/s/1wmoCICJiw5r8SutCV4KwNQ 
提取碼:vvki 
--來自百度網盤超級會員V6的分享

這題本意是使用(15條訊息) XCTF-L3HCTF2021 DeepDarkFantasy write up_AliceNCsyuk的博客-CSDN博客

這道題的預期解法是用上述博客中前半部分模型逆向的方法來逆出模型的,但是根據實際做題情況,直接拖winhex找Zmxh23就能找到flag了,,,,
在這里插入圖片描述

flag{model_reverse_is_an_important_skill!}

5. MNIST分類器

nc 0.0.0.0 9999
在這個挑戰中,你需要訓練一個mnist分類器,我將會隨機給你發送20張圖片的base64編碼,你需要在20秒內正確識別出他們并將結果以如'10973852443528710983'這樣的形式發給我,本題有一個附件mnist2base64.py,描述的是我如何生成這些base64編碼
import base64
from torchvision import transforms, datasets
from torch.utils.data import DataLoader

batch_size=1
def get_data(train):
    data_tf = transforms.Compose([transforms.ToTensor()])
    train_data = datasets.MNIST(root='./data', train=train, transform=data_tf, download=True)
    train_loader = DataLoader(train_data, shuffle=True, batch_size=batch_size, drop_last=True)
    return train_loader

savepath='./base64_1000.txt'
f=open(savepath,'w')
pic_num=1000

train_data = get_data(True)

for img, lab in train_data:
    pic_num-=1
    if(pic_num==0):
        break
    img = img.view(img.size(0), -1).numpy().astype("float32").tobytes()
    img = bytes.decode(base64.b64encode(img))
    lab=lab.tolist()[0]
    f.write(img+','+str(lab)+'\n')
    f.flush()

f.close()

提供的附件中告知了使用的資料集為torchvision.datasets.MNIST,并且詳細描述了生成base64編碼的方法,這題本質上只是考察訓練模型的基本功,多種模型都可以達到要求,比如DNN,CNN這些簡單網路,這里直接放出exp,模型來自n1ctf2021的collision,是CNN網路

import numpy as np
import torch
import torch.nn as nn
import torch.nn.functional as F
from base64 import b64decode
from pwn import *


class Net(nn.Module):
    def __init__(self):
        super(Net, self).__init__()
        self.conv1 = nn.Conv2d(1, 32, 3, 1)
        self.conv2 = nn.Conv2d(32, 64, 3, 1)
        self.dropout1 = nn.Dropout(0.25)
        self.dropout2 = nn.Dropout(0.5)
        self.fc1 = nn.Linear(9216, 128)
        self.fc2 = nn.Linear(128, 10)

    def forward(self, x):
        x = self.conv1(x)
        x = F.relu(x)
        x = self.conv2(x)
        x = F.relu(x)
        x = F.max_pool2d(x, 2)
        x = self.dropout1(x)
        x = torch.flatten(x, 1)
        x = self.fc1(x)
        x = self.fc2(x)
        x = F.sigmoid(x)
        return x


def load_model(path):
    model = Net()
    model.load_state_dict(torch.load(path, map_location="cpu"))
    return model.eval()

model = load_model("./database/convNet.pt")

r=remote('0.0.0.0',9999)
r.recvuntil(b'in 10s\n')
ans=''
for i in range(20):
    data = r.recvline()
    #print(data)
    data=bytes.decode(data)
    img = b64decode(data)
    img = np.frombuffer(img, dtype="float32")
    img = torch.FloatTensor(img).reshape(1, 1, 28, 28)
    tmpans = model(img)
    tmplist=tmpans.tolist()[0]
    maxnum=-2.0
    tmpnum=0
    for j in range(len(tmplist)):
        if(tmplist[j]>maxnum):
            maxnum=tmplist[j]
            tmpnum=j
    ans+=str(tmpnum)
print(ans)
r.recvuntil(b'83 > \n')
r.sendline(str.encode(ans))
flag=r.recvline()
print(bytes.decode(flag))
r.interactive()

完整的題目附件都在下面了

鏈接:https://pan.baidu.com/s/1A-y8hZHJFgiQ3T7gNyJsFQ 
提取碼:o8n7 
--來自百度網盤超級會員V6的分享
flag{now_you_are_the_master_of_AI_0xffa5eca6678d636435ab70d2}

6. 簡單的FGSM

nc 0.0.0.0 9998
我在本題中使用LeNet訓練了一個二分類網路(mnist中的47),我將會給你訓練好的網路target.pt,以及一張原始影像‘4’的base64編碼(.py代碼中),你需要生成一張圖片,使其在滿足Check函式中的L1和L2約束的情況下,讓target.pt網路誤以為它是一張‘7
from base64 import b64decode
from torch import nn
import torch.nn.functional as func
import numpy as np
import torch
import os

class LeNet(nn.Module):
    def __init__(self,dimy):
        super(LeNet,self).__init__()
        self.conv1=nn.Conv2d(3,6,5)
        self.conv2=nn.Conv2d(6,16,5)
        self.linear1=nn.Linear(256,120)
        self.linear2=nn.Linear(120,84)
        self.linear3=nn.Linear(84,10)
        self.linear4=nn.Linear(10,dimy)
    def forward(self,x):
        x=func.relu(self.conv1(x))
        x=func.max_pool2d(x,2)
        x=func.relu(self.conv2(x))
        x=func.max_pool2d(x,2)
        x=x.view(x.size(0),-1)
        x=func.relu(self.linear1(x))
        x=func.relu(self.linear2(x))
        x=self.linear3(x)
        x=torch.sigmoid(self.linear4(x))
        return x

mymodal=torch.load('./target.pt')
mymodal.eval()

base64_src='AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADAuLjoPwAAACAeHs4/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgGRnJPwAAAIB+fu4/AAAAIBUVxT8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgEBCAPwAAAGBXV+c/AAAAoJ2d7T8AAAAgFRW1PwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAODQ0OA/AAAA4NTU1D8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAWFtY/AAAAwLq66j8AAAAgGhq6PwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAQDAw4D8AAABgVVXlPwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIBAQ4D8AAAAgHh7ePwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADg1tbWPwAAAEA6Ouo/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIBAQwD8AAABgXV3tPwAAACAcHNw/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAODW1tY/AAAAYF5e7j8AAAAgHh6+PwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgHR3dPwAAAODb2+s/AAAAIBUVtT8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAYFVV5T8AAACgnp7uPwAAACAdHc0/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgHh6+PwAAACAeHu4/AAAAIB8f3z8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIBQUxD8AAABAPz/vPwAAAGBRUeE/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgGBiIPwAAAODf398/AAAAQD4+7j8AAAAgEhKyPwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgHh6uPwAAAODc3Ow/AAAA4NDQ4D8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAQELA/AAAA4N/f7z8AAACAdnbmPwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAwLS05D8AAADg0NDgPwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIBISoj8AAAAA+PfnPwAAAEA9Pe0/AAAAIBER4T8AAABgWVnZPwAAACAUFLQ/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABgXFzcPwAAAAD7+uo/AAAAIB8fvz8AAAAgHx+/PwAAACAfH78/AAAAIBAQgD8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAQEKA/AAAAYFZW1j8AAAAgEBDgPwAAAGBYWOg/AAAAYFtb6z8AAABgWlrqPwAAAGBaWuo/AAAAgHp66j8AAABgWlrqPwAAAGBcXOw/AAAA4N/f7z8AAADg39/vPwAAAKCZ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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'
src= np.frombuffer(b64decode(base64_src),dtype="float64")
src=np.clip(src, 0, 1)

def Check(buf):
    L1_THRES=12.0
    L2_THRES=1.0
    global src
    arr = np.frombuffer(buf, dtype="float64")
    if arr.shape[0] != 3 * 28 * 28:
        raise BufferError("hacker")
    arr = np.clip(arr, 0, 1)
    diff = arr - src
    if np.linalg.norm(diff, 1) > L1_THRES or np.linalg.norm(diff, 2) > L2_THRES:
        raise BufferError("attack failed")
    arr = torch.FloatTensor(arr).reshape(1, 3, 28, 28)
    return (mymodal(arr)<0.5).tolist()[0][0]

print(Check(b64decode(base64_src)))

這題考察fgsm這種常用的對抗樣本演算法,對于fgsm的講解可以看我的這篇文章(15條訊息) N1CTF2021 Collision exp決議write up_AliceNCsyuk的博客-CSDN博客

不過在這題有一點需要注意的是,由于Check函式中只需要滿足分類得到的值小于0.5即可,所以在設定目標label的時候,可以選擇0.36這種小于0.5的數值,而不是0.0,這樣可以更容易達到l1和l2約束,exp如下

from torch import nn
from torch.utils.data import Dataset,DataLoader
import torch.nn.functional as func
import numpy as np
import torch
from PIL import Image
import os
import base64
import random
from torchvision import transforms
from torch.autograd import Variable


class LeNet(nn.Module):
    def __init__(self,dimy):
        super(LeNet,self).__init__()
        self.conv1=nn.Conv2d(3,6,5)
        self.conv2=nn.Conv2d(6,16,5)
        self.linear1=nn.Linear(256,120)
        self.linear2=nn.Linear(120,84)
        self.linear3=nn.Linear(84,10)
        self.linear4=nn.Linear(10,dimy)
    def forward(self,x):
        x=func.relu(self.conv1(x))
        x=func.max_pool2d(x,2)
        x=func.relu(self.conv2(x))
        x=func.max_pool2d(x,2)
        x=x.view(x.size(0),-1)
        x=func.relu(self.linear1(x))
        x=func.relu(self.linear2(x))
        x=self.linear3(x)
        x=torch.sigmoid(self.linear4(x))
        return x

class MyDataSet(Dataset):
    def __init__(self,datapath,trans=None):
        self.datapath=datapath;self.trans=trans
        self.data=list()
        self.label_map={'4':0,'7':1}
        path1=datapath+'/4/'
        path2=datapath+'/7/'
        filist1=os.listdir(path1)
        flist2=os.listdir(path2)
        for i in range(len(filist1)):
            tmppath=path1+filist1[i]
            tmpimg = Image.open(tmppath).convert('RGB')
            if (self.trans != None):
                tmpimg = self.trans(tmpimg)
            self.data.append((tmpimg, 1.0))
        for i in range(len(flist2)):
            tmppath=path2+flist2[i]
            tmpimg = Image.open(tmppath).convert('RGB')
            if (self.trans != None):
                tmpimg = self.trans(tmpimg)
            self.data.append((tmpimg, 0.36))

    def __len__(self):
        return len(self.data)

    def __getitem__(self, item):
        return self.data[item][0],self.data[item][1]

def set_seed(seed=0):
    random.seed(seed)
    np.random.seed(seed)
    torch.manual_seed(seed)
    torch.cuda.manual_seed(seed)

def save_image(arr, path):
    im = Image.fromarray(arr)
    im.save(path)

atk_trans=transforms.Compose([transforms.ToTensor()])

mainpath="./database/mnist/"
atkpath=os.path.join(mainpath,"atk")
atk_data=MyDataSet(atkpath,atk_trans)
batch_size=1
atk_load=DataLoader(atk_data,batch_size=batch_size,drop_last=True)

mymodal=torch.load('./database/target.pt')
mymodal.train()
tmpans=0
image=0
cnt=0
for _, data in enumerate(atk_load):
    images, ans = data
    if(cnt==1):
        tmpans = ans.float()
    if(cnt==0):
        image=images
    cnt += 1

src=image.squeeze().detach().flatten().numpy().astype("float64")
src=np.clip(src, 0, 1)

picpath=mainpath+'/atk/4/mnist_test_24.png'
adv=Variable(image,requires_grad=True)
loss_f=nn.L1Loss()
loss_l2=nn.MSELoss()
lr=0.1
RATIO=1.0
epoch=1000
print("before atk:  ",mymodal(adv))
print(mymodal(adv))

for i in range(epoch):
    y=mymodal(adv)
    l1l = loss_f(adv, image) * RATIO
    l2l = loss_l2(y,tmpans)
    loss = l1l+l2l
    loss=loss
    loss.backward()
    adv.requires_grad = False
    data1 = adv.squeeze().detach().numpy().astype("float64").tobytes()
    arr1 = np.frombuffer(data1, dtype="float64")
    arr1 = np.clip(arr1, 0, 1)
    diff = arr1 - src
    a, b = (np.linalg.norm(diff, 1), np.linalg.norm(diff, 2))
    if(i==epoch-1):
        print(a,' --------------------> ',b)
    adv = adv - adv.grad * lr
    adv = adv.clamp(0, 1)
    adv.requires_grad = True

print("after atk:  ",mymodal(adv))
ans=adv.squeeze().detach().flatten().numpy().astype("float64")
ans=np.clip(ans, 0, 1)
ans=base64.b64encode(ans.tobytes())


from pwn import *
r=remote('0.0.0.0',9998)
r.recvuntil(b'> \n')
r.sendline(ans)
flag=r.recvline()
print(bytes.decode(flag))
r.interactive()
鏈接:https://pan.baidu.com/s/12gxLyrjvPGilWUphtptxqQ 
提取碼:3ehl 
--來自百度網盤超級會員V6的分享
flag{ohhhh^_^!_fg5m_ls_gr3at-->:D}

轉載請註明出處,本文鏈接:https://www.uj5u.com/qita/420464.html

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