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neptunia 2017-03-10 19:21:45 -05:00
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rsa3/description.md Normal file
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I found somebody's notes on their private RSA! Help me crack [this](${ciphertext_txt}).
=======
We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.
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I found somebody's notes on their private RSA! Help me crack [this](${ciphertext_txt}).
=======
We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.
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I found somebody's notes on their private RSA! Help me crack [this](${ciphertext_txt}).
=======
We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.
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We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.

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We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.

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I found somebody's notes on their private RSA! Help me crack [this](${ciphertext_txt}).
=======
We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.
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I found somebody's notes on their private RSA! Help me crack [this](${ciphertext_txt}).
=======
We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.
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rsa3/grader.py Normal file
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from cStringIO import StringIO
flag = "wh3n_y0u_h4ve_p&q_RSA_iz_ez"
def modx(base,exp,mod):
r = 1;
while (exp > 0):
if (exp % 2 == 1):
r = (r * base) % mod
base = (base * base) % mod
exp = exp/2
return r
def probprime(s):
if s%2==0:
s += 1
smolprimes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]
while len(set([modx(i,s-1,s) for i in smolprimes])) != 1 or modx(2,s-1,s) != 1:
s+=2
return(s)
def get_problem(random):
# add Probable Prime function later
p = probprime(random.randint(3*10**79,4*10**79))
q = probprime(random.randint(3*10**79,4*10**79))
e = 3
salt = "".join([random.choice("0123456789abcdef") for i in range(8)])
return (p, q, e, salt)
def generate_ciphertext(random):
p, q, e, salt = get_problem(random)
encoded = int(("easyctf{%s_%s}" % (flag, salt)).encode('hex'),16)
ciphertext = 'p: '+str(p)+'\n'
ciphertext += 'q: '+str(q)+'\n'
ciphertext += 'e: '+str(e)+'\n'
ciphertext += 'c: '+str(pow(encoded, e, p*q))+'\n'
return StringIO(ciphertext)
def generate(random):
return dict(files={
"ciphertext_rsa1.txt": generate_ciphertext
})
def grade(random, key):
n, salt = get_problem(random)
if key.find("%s_%s" % (flag, salt)) >= 0:
return True, "Correct!"
return False, "Nope."
=======
def grade(autogen, key):
if key.find("tw0_v3ry_merrry_tw1n_pr1m35!!_417c0d") != -1:
return True, "Really Superb! Applause!"
return False, "RIP"
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rsa3/problem.yml Normal file
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title: RSA 1
author: neptunia
hint: Go google RSA if you're stuck.
category: Cryptography
autogen: true
programming: false
value: 25
=======
author: blockingthesky
title: RSA 3
hint: You might want to read up on how RSA works.
category: Cryptography
autogen: false
programming: false
value: 70
files:
- rsa3
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{N : e : c}
{0x27335d21ca51432fa000ddf9e81f630314a0ef2e35d81a839584c5a7356b94934630ebfc2ef9c55b111e8c373f2db66ca3be0c0818b1d4eda7d53c1bd0067f66a12897099b5e322d85a8da45b72b828813af23L : 0x10001 : 0x9b9c138e0d473b6e6cf44acfa3becb358b91d0ba9bfb37bf11effcebf9e0fe4a86439e8217819c273ea5c1c5acfd70147533aa550aa70f2e07cc98be1a1b0ea36c0738d1c994c50b1bd633e3873fc0cb377e7L}

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I found somebody's notes on their private RSA! Help me crack [this](${ciphertext_txt}).
=======
We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.
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<<<<<<< HEAD
I found somebody's notes on their private RSA! Help me crack [this](${ciphertext_txt}).
=======
We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.
>>>>>>> 93577ddee37a489cf0aa1a4b987d23a3bc3d2657
=======
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We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.

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We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.

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<<<<<<< HEAD
I found somebody's notes on their private RSA! Help me crack [this](${ciphertext_txt}).
=======
We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.
>>>>>>> 93577ddee37a489cf0aa1a4b987d23a3bc3d2657

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<<<<<<< HEAD
I found somebody's notes on their private RSA! Help me crack [this](${ciphertext_txt}).
=======
We came across another [message]($rsa3) that follows the same cryptographic schema as those other Really Scary Admin messages. Take a look and see if you can crack it.
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{N : e : c}
{0x27335d21ca51432fa000ddf9e81f630314a0ef2e35d81a839584c5a7356b94934630ebfc2ef9c55b111e8c373f2db66ca3be0c0818b1d4eda7d53c1bd0067f66a12897099b5e322d85a8da45b72b828813af23L : 0x10001 : 0x9b9c138e0d473b6e6cf44acfa3becb358b91d0ba9bfb37bf11effcebf9e0fe4a86439e8217819c273ea5c1c5acfd70147533aa550aa70f2e07cc98be1a1b0ea36c0738d1c994c50b1bd633e3873fc0cb377e7L}