small weiner
来源：dvCTF
Someone I hate sent me an insulting message using RSA. Can you retrieve his private key?
m = 0x596f7520686176652073756368206120736d616c6c207765696e65722e2049204841544520594f5521212121
N = 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
e = 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
Flag format: dvCTF{d} with d in decimal (base 10)
之前做过一道已知c、m、n，求e的题
e=discrete_log(Mod(c,n),Mod(m,n))
所以这道应该
c = pow(m,e,N)
#c=803966748369093233867528670117833695673019045146866931674002529382581720466964038191118280233118778917693162909504749272637492591195155393830971306115662080454967101948208729181122662448033376455217412810428221150860739111744891956071056258413939565797976786982177166776259145668693871636782829074007793365982929885590007721015679407919307454597278784981674195161328092740619373294281239315918017584677709790325315202460959006049647790786848526319418345336115633228348623643747179118075155352279546884736186472718395207758873686387097911945774041633369812537580494436666655940958749843252996591801802720436045000085843967300119690956070340746966169967868549762159240374136639389419083565794256399400183300129021073200138882121476590630811020518868942385684725157562159316602749982901807520325564058116507232844541416904622352664641645136812679754528456915712750341861801262302690574858787275654591520414601305664500910787777
d = discrete_log(Mod(m,N),Mod(c,N))
但是好像没有运行出来哎~
Secure Or Not Secure
I made secure application but i lost my cookie and now I can't connect. Can you help me?
nc challs.dvc.tf 2600
nc进入
------ Welcome to my secure login system ------
1. Login
2. Register
3. Exit
-----------------------------------------------
>>> 2
Username: re
Password: re
Here is your cookie: wr2TBvKa+oU0HY7emHvxwwgozYdLN6f1q76CQ5o+ahBzZv0Qf9p2645P90f+TqW566M5wYbOeg==
------ Welcome to my secure login system ------
1. Login
2. Register
3. Exit
-----------------------------------------------
>>> 1
Cookie: wr2TBvKa+oU0HY7emHvxwwgozYdLN6f1q76CQ5o+ahBzZv0Qf9p2645P90f+TqW566M5wYbOeg==
You're not the admin! The cookie b'username=re\x00\x00\x00\x00\x00\x00;admin=False;password=re\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' is invalid!
------ Welcome to my secure login system ------
1. Login
2. Register
3. Exit
-----------------------------------------------
>>> 2
Username: a
Password: a
Here is your cookie: wr2TBvKa+oU0DuvemHvxwwgozYdLN6f1q76CQ5o+ahBzZv0Qf9p2+OtP90f+TqW566M5wYbOeg==
------ Welcome to my secure login system ------
1. Login
2. Register
3. Exit
-----------------------------------------------
>>> 1
Cookie: \xc2\xbd\x93\x06\xf2\x9a\xfa\x854\x0e\xeb\xde\x98{\xf1\xc3\x08(\xcd\x87K7\xa7\xf5\xab\xbe\x82C\x9a>j\x10sf\xfd\x10\x7f\xdav\xf8\xebO\xf7G\xfeN\xa5\xb9\xeb\xa39\xc1\x86\xcez
Are you trying to cheat?!
------ Welcome to my secure login system ------
1. Login
2. Register
3. Exit
-----------------------------------------------
>>> 3
wr2TBvKa+oU0DuvemHvxwwgozYdLN6f1q76CQ5o+ahBzZv0Qf9p2+OtP90f+TqW566M5wYbOeg==显示解码失败
用python解还显示不对
那还能怎样🤔
Cwyptographic Owacle
Nya :3
nc challs.dvc.tf 2601
import ecdsa
import random
import hashlib
import time
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad
from Crypto.Util.number import long_to_bytes
FLAG = b'dvCTF{XXXXXXXXXXXXXXXXXXX}'
def encrypt_flag(priv):
key = long_to_bytes(priv)
cipher = AES.new(key, AES.MODE_ECB)
text = cipher.encrypt(pad(FLAG, 16))
print(text.hex())
m = 0
print("Hiii ~~ Pwease feel fwee to use my sooper dooper cwyptographic owacle! ~~~~~~")
while True:
print("[1] > Sign your own message ≧?≦")
print("[2] > Get the signed flag uwu ~~ ")
print("[3] > Quit (pwease don't leave me)")
try:
n = int(input())
if n<0 or n>3:
raise
except:
print("Nice try ?_?")
exit(1)
if n==1:
msg = input("What's your message senpai? (●′ω｀●) > ")
G = ecdsa.NIST256p.generator
order = G.order()
priv = random.randrange(1,order)
Public_key = ecdsa.ecdsa.Public_key(G, G * priv)
Private_key = ecdsa.ecdsa.Private_key(Public_key, priv)
k = random.randrange(1, 2**128) if m==0 else int(time.time())*m
m = int(hashlib.sha256(msg.encode()).hexdigest(),base=16)
sig = Private_key.sign(m, k)
print (f"Signature (r,s): ({sig.r},{sig.s})")
elif n==2:
if m==0:
G = ecdsa.NIST256p.generator
order = G.order()
priv = random.randrange(1,order)
encrypt_flag(priv)
else:
print("Cya (?︵?) ")
exit(1)
是AES.MODE_ECB，还有ecdsa的数字签名
Hiii ~~ Pwease feel fwee to use my sooper dooper cwyptographic owacle! ~~~~~~
[1] > Sign your own message ≧?≦
[2] > Get the signed flag uwu ~~
[3] > Quit (pwease don't leave me)
1
What's your message senpai? (●′ω｀●) > re
Signature (r,s): (5574199079485227229736032865599767885817418344312674047445645256117624859582,51462972268344716865531777000256743426644776909735353695777643263919964904375)
[1] > Sign your own message ≧?≦
[2] > Get the signed flag uwu ~~
[3] > Quit (pwease don't leave me)
2
3fbb20769e7cb4c00c5fd86a8ca8ba23f5b4b38dfa9cba4c9db98d45ca5a008e5658dfdcffcfcab9671fd038e299fcde
[1] > Sign your own message ≧?≦
[2] > Get the signed flag uwu ~~
[3] > Quit (pwease don't leave me)
3
Cya (?︵?)
补一下ECDSA算法吧，只是看着眼熟，不太懂
RSA
Easy
Our team has found a cipher text: there seems to be some clues to decipher it. Can you help us to read it?
n = 0x7CD1020889B4382BE84B3F14EAAE242755CC1BD56F431B348F4FF8F207A96F41AFCF3EBDF4C17CB6537AD4B01B9FF9497763B22D013B614C8FCDB0C34F9D88F1A523013791EDFEB1FBBA160799892C118892FB7F199C9957DF5A26DAB4D776E5226F06ACD05412F6DD2B1B75D24CE9DC2DDAC513BCB96CD9B97F9BEF8543A3A1
phi = 0x7CD1020889B4382BE84B3F14EAAE242755CC1BD56F431B348F4FF8F207A96F41AFCF3EBDF4C17CB6537AD4B01B9FF9497763B22D013B614C8FCDB0C34F9D88F037D2317D3864035ECE8BCDD458711B788B5B3FDFD5164F7D736D0A56F416E8C16126E3868D73F54AF4D61F6033E069994319C849460C60A725A0F4DD97EDCC84
e = 0x10001
ct = 0x268D7D5F5593EA30F536635B58585620B51D2D143AFE4734635C259278D61413D0C89678E81EDF466B1E45E27EBF802F62F61263E499A516465163C7CB668F94258B3424C3E2BD76634923DECD670E4B6034F8FD00C76F9DAD00A72DB22B70B9408C89FCEE4C9B0D2D4B5664284328711BFAD57FBE1EDCC0854AAD57390DCAD6
Hint：There is another decoding step after the decryption!
所以解密前还要做什么啊
反正不是直接解，因为直接解会：
import gmpy2
from Crypto.Util.number import long_to_bytes
n = 0x7CD1020889B4382BE84B3F14EAAE242755CC1BD56F431B348F4FF8F207A96F41AFCF3EBDF4C17CB6537AD4B01B9FF9497763B22D013B614C8FCDB0C34F9D88F1A523013791EDFEB1FBBA160799892C118892FB7F199C9957DF5A26DAB4D776E5226F06ACD05412F6DD2B1B75D24CE9DC2DDAC513BCB96CD9B97F9BEF8543A3A1
phi = 0x7CD1020889B4382BE84B3F14EAAE242755CC1BD56F431B348F4FF8F207A96F41AFCF3EBDF4C17CB6537AD4B01B9FF9497763B22D013B614C8FCDB0C34F9D88F037D2317D3864035ECE8BCDD458711B788B5B3FDFD5164F7D736D0A56F416E8C16126E3868D73F54AF4D61F6033E069994319C849460C60A725A0F4DD97EDCC84
e = 0x10001
ct = 0x268D7D5F5593EA30F536635B58585620B51D2D143AFE4734635C259278D61413D0C89678E81EDF466B1E45E27EBF802F62F61263E499A516465163C7CB668F94258B3424C3E2BD76634923DECD670E4B6034F8FD00C76F9DAD00A72DB22B70B9408C89FCEE4C9B0D2D4B5664284328711BFAD57FBE1EDCC0854AAD57390DCAD6
d = gmpy2.invert(e,phi)
m = gmpy2.powmod(ct,d,n)
print(m)
print(long_to_bytes(m))
#100118678470123102108521039599861127251114116518811695988695828352125
#b'\x03\xb6\xaf\x06\x92g\x03"\xecu\xb7\xee\x13?\xcb\xa4\x8f\xee\xd7\xf9(\x9dy/J\xcc\x15L}'
QmFzZTY0
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
base64解码
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
在解一次？
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
继续？
。。。
重复了不知道多少次
终于：dvCTF{Base64_Is_The_Best}
EBG13
We found this message : can you decipher it?
qiPGS{3apElcg1ba_1f_r4fl}
这个简单
凯撒爆破
当key = 13 时 解密结果为：dvCTF{3ncRypt1on_1s_e4sy}
ICMP
pcap文件是常用的数据报存储格式，可以理解为就是一种文件格式，只不过里面的数据是按照特定格式存储的，所以我们想要解析里面的数据，也必须按照一定的格式。普通的记事本打开pcap文件显示的是乱码，用Ultra Edit能够以16进制数据的格式显示，用wireshark这种抓包工具就可以正常打开这种文件，愉快地查看里面的网络数据报了，同时wireshark也可以生成这种格式的文件。当然这些工具只是我经常使用的，还有很多其它能够查看pcap文件的工具。
用Wireshark打开
找到一处异常
然后，就没看到异常了，所以这意思是flag不在这吗😬
Sudoku
Can you solve this sudoku quickly enough?
http://challs.dvc.tf:6002
这个好玩
嗯？？？？
好不容易解出来了了结果点提交没加载出来，
重新加载就不是一个数独了😟
这次先点下提交会怎样
呃，，，，，
时间过长:会话已经过期
所以这道题是不该这么解的吧