この大会は2020/7/25 2:00(JST)～2020/7/25 22:00(JST)に開催されました。
今回もチームで参戦。結果は2203点で491チーム中24位でした。
自分で解けた問題をWriteupとして書いておきます。
sanity check (Misc)
PDFの最後のページにフラグが書いてあった。
3k{s4n1ty_ch3ck_fl4g_0000}
You shall not get my cookies (Crypto)
$ nc youshallnotgetmycookies.3k.ctf.to 13337 p~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~k | | | ~ Welcome to the `Crypto Bakery` ~ | | | c~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~s7 ~ This is where we bake our finest cookies. ~ Here, taste one yourself: ~ 90C560B2A01529EF986E54B016E1FEAAD79A54BE52B373311E3B4F8251BE269EC199AE6B370BFCE50A54EEC25ABB0F22 ~ Isn't it tasty? ~ Ok, here is the deal. I got what you want. ~ If you bring me some 'Maple Oatmeal Biscuits', I will tell my secret. ~ Oh, I will give you one more hint. My favourite cookies are 'hazelnut cookies', I always do them first! ~ So... whats your cookie: 90C560B2A01529EF986E54B016E1FEAAD79A54BE52B373311E3B4F8251BE269EC199AE6B370BFCE50A54EEC25ABB0F22 ~ Nop. :(
提示されたhexデータは長さ96で48バイト。AES暗号のようなブロック暗号で、これが'hazelnut cookies'のIVを含む暗号化データと推測できる。試しに末尾だけ変更したデータを指定してみる。
$ nc youshallnotgetmycookies.3k.ctf.to 13337 p~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~k | | | ~ Welcome to the `Crypto Bakery` ~ | | | c~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~s7 ~ This is where we bake our finest cookies. ~ Here, taste one yourself: ~ 90C560B2A01529EF986E54B016E1FEAAD79A54BE52B373311E3B4F8251BE269EC199AE6B370BFCE50A54EEC25ABB0F22 ~ Isn't it tasty? ~ Ok, here is the deal. I got what you want. ~ If you bring me some 'Maple Oatmeal Biscuits', I will tell my secret. ~ Oh, I will give you one more hint. My favourite cookies are 'hazelnut cookies', I always do them first! ~ So... whats your cookie: 90C560B2A01529EF986E54B016E1FEAAD79A54BE52B373311E3B4F8251BE269EC199AE6B370BFCE50A54EEC25ABB0F21 ~ That cookie looks burned!
今度は先頭だけ変更したデータを指定してみる。
$ nc youshallnotgetmycookies.3k.ctf.to 13337 p~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~k | | | ~ Welcome to the `Crypto Bakery` ~ | | | c~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~s7 ~ This is where we bake our finest cookies. ~ Here, taste one yourself: ~ 90C560B2A01529EF986E54B016E1FEAAD79A54BE52B373311E3B4F8251BE269EC199AE6B370BFCE50A54EEC25ABB0F22 ~ Isn't it tasty? ~ Ok, here is the deal. I got what you want. ~ If you bring me some 'Maple Oatmeal Biscuits', I will tell my secret. ~ Oh, I will give you one more hint. My favourite cookies are 'hazelnut cookies', I always do them first! ~ So... whats your cookie: 70C560B2A01529EF986E54B016E1FEAAD79A54BE52B373311E3B4F8251BE269EC199AE6B370BFCE50A54EEC25ABB0F22 ~ Nop. :(
'Maple Oatmeal Biscuits'の暗号化を指定する必要がある。
0123456789abcdef Maple Oatmeal Bi scuitsPPPPPPPPPP p0 ^ iv --AES--> c0 p1 ^ c0 --AES--> c1
paddingが正しいと、"~ Nop. :("と返されるのかもしれない。CBC Padding Oracle Attackで'Maple Oatmeal Biscuits'の暗号化データを作る。
import socket from Crypto.Util.strxor import strxor def recvuntil(s, tail): data = '' while True: if tail in data: return data data += s.recv(1) def pad(s): p = 16 - len(s) % 16 return s + chr(p) * p def is_valid(enc): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(('youshallnotgetmycookies.3k.ctf.to', 13337)) data = recvuntil(s, 'cookie: \n').rstrip() print data print enc s.sendall(enc + '\n') data = recvuntil(s, '\n').rstrip() print data if 'burned!' in data: return False else: return True pt = pad('Maple Oatmeal Biscuits') pt_blocks = [pt[i:i+16] for i in range(0, len(pt), 16)] enc_blocks = ['\x00' * 16] * 3 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(('youshallnotgetmycookies.3k.ctf.to', 13337)) data = recvuntil(s, 'cookie: \n').rstrip() print data ct = data.split('\n')[8][1:].strip() enc_blocks[2] = ct[64:].decode('hex') for i in range(len(enc_blocks)-1, 0, -1): xor_block = '' for j in range(16): for code in range(256): print '%d - %d - %d: %s' % (i, j, code, xor_block.encode('hex')) try_pre_block = '\x00' * (16 - j - 1) + chr(code) + strxor(xor_block, chr(j+1)*j) try_cipher = (try_pre_block + enc_blocks[i]).encode('hex').upper() if is_valid(try_cipher): xor_code = (j+1) ^ code xor_block = chr(xor_code) + xor_block break enc_blocks[i - 1] = strxor(xor_block, pt_blocks[i - 1]) enc = (''.join(enc_blocks)).encode('hex').upper() s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(('youshallnotgetmycookies.3k.ctf.to', 13337)) data = recvuntil(s, 'cookie: \n').rstrip() print data print enc s.sendall(enc + '\n') data = recvuntil(s, '\n').rstrip() print data data = recvuntil(s, '\n').rstrip() print data
実行結果は以下の通り。
：
p~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~k
| |
| ~ Welcome to the `Crypto Bakery` ~ |
| |
c~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~s7
~ This is where we bake our finest cookies.
~ Here, taste one yourself:
~ 90C560B2A01529EF986E54B016E1FEAAD79A54BE52B373311E3B4F8251BE269EC199AE6B370BFCE50A54EEC25ABB0F22
~ Isn't it tasty?
~ Ok, here is the deal. I got what you want.
~ If you bring me some 'Maple Oatmeal Biscuits', I will tell my secret.
~ Oh, I will give you one more hint. My favourite cookies are 'hazelnut cookies', I always do them first!
~ So... whats your cookie:
12EA20C966B1BB1C0E0DB9B647B3ACD4C7964EBC4FA573311E3B4F8251BE269EC199AE6B370BFCE50A54EEC25ABB0F22
~ YES, that is exactly what i wanted!
~ Take it! 3k{Y3t_An0th3r_Padd1ng_Oracle}
3k{Y3t_An0th3r_Padd1ng_Oracle}
once upon a time (Crypto)
XOR暗号だが、AES暗号のモードのように暗号化される。ecbモードの場合は、もう一度暗号化すれば復号される。
$ ./scss flag_encrypted flag encrypt ecb $ xxd -g 1 flag 00000000: 91 19 69 64 12 c8 b5 25 9a c1 14 6e 5b be 99 ad ..id...%...n[... 00000010: 67 17 2d fe 73 be 77 7f 3a c5 03 f0 c1 f9 2a 93 g.-.s.w.:.....*. 00000020: e0 16 54 79 b3 4b d4 ae 9a 6c d8 60 d9 21 e9 5c ..Ty.K...l.`.!.\ 00000030: b6 79 c3 ce bd c4 c1 1b e4 36 54 54 04 05 d0 25 .y.......6TT...% 00000040: 01 1c ce 24 e6 39 1a 98 58 49 56 e6 59 5b 48 6f ...$.9..XIV.Y[Ho 00000050: ab d0 42 61 8b 44 1d d1 7e 8e 69 1d 13 2f 55 69 ..Ba.D..~.i../Ui 00000060: c1 14 8d a1 b7 28 d7 7a fb fc 0b 5f 05 21 41 39 .....(.z..._.!A9 00000070: 5a Z
一応試したが、やはり復号できない。
cbcモードの場合は、末尾だけ変えても、暗号化は変わらず、先頭から順にXOR鍵を割り出していけば復号できる。
$ cat solve_cbc.py import os cmd = './scss flag try_flag_enc encrypt cbc' with open('flag_encrypted', 'rb') as f: flag_enc = f.read() flag = '' for i in range(len(flag_enc)): try_flag = flag + '0' with open('flag', 'wb') as f: f.write(try_flag) os.system(cmd) with open('try_flag_enc', 'rb') as f: try_flag_enc = f.read() code = ord(try_flag_enc[i]) ^ ord(flag_enc[i]) ^ ord('0') flag += chr(code) with open('flag', 'wb') as f: f.write(flag) $ python solve_cbc.py $ xxd -g 1 flag 00000000: 33 58 10 16 14 26 37 09 0f 0a 17 2c 3e 13 17 3a 3X...&7....,>..: 00000010: 2d 17 02 0e 1a 07 11 17 17 01 3b 3e 12 2c 33 09 -.........;>.,3. 00000020: 11 1c 09 0d 33 28 12 04 11 1f 01 1d 2c 2b 1c 09 ....3(......,+.. 00000030: 15 2b 32 08 04 0f 1d 2c 28 12 3a 38 02 11 2b 36 .+2....,(.:8..+6 00000040: 07 1a 1b 30 3e 3e 39 0f 0e 0f 1c 2b 36 36 3e 02 ...0>>9....+66>. 00000050: 00 0a 0d 01 0b 1a 15 0d 00 15 26 34 02 05 00 33 ..........&4...3 00000060: 26 16 1a 2a 36 36 38 08 30 2b 1b 30 35 0b 08 05 &..*668.0+.05... 00000070: 11 .
cbcモードもはずれ。
ofbモードの場合は、ecbモードと同様にもう一度暗号化すれば復号される。
$ ./scss flag_encrypted flag encrypt ofb $ cat flag 3k{my_hands_are_registered_as_lethal_weapons_that_means_we_get_into_a_fight_i_accidentally_kill_you_i_go_to_jail}
3k{my_hands_are_registered_as_lethal_weapons_that_means_we_get_into_a_fight_i_accidentally_kill_you_i_go_to_jail}
pyzzle1 (Reversing, Misc, Crypto)
Pythonコードにすると、以下のようになる。
import binascii plaintext = "REDACTED" def exor(a, b): temp = "" for i in range(n): if (a[i] == b[i]): temp += "0" else: temp += "1" return temp def BinaryToDecimal(binary): string = int(binary, 2) return string # encryption PT_Ascii = [ord(x) for x in plaintext] PT_Bin = [format(y, '08b') for y in PT_Ascii] PT_Bin = "".join(PT_Bin) n = 26936 K1 = '0100000011101101110001010100111110100101001111010000111101111100110110111000100100100001101000110001010011011100001001110110011011111011000011001000111010101000100100011010101101101101001100011111011100011101100101000110010000100011100110001010010011111110111101010101110100101000000001010111110010010011010011011000110101001111110011011010000011000001101000011110110000010010001101010010100110010000000001101000011010000111100000111001111100100001001100100100011111000111010100000101011100101101111111100100101110110110101111000111101000101011000100101101111000100111110110100001101000111111110000100001110010110010101010000100001001110100010001000000110101111101010010000000111011011010111111101111001011100001110110100001011110101110000001101110010111010101111010010011110101000001100011010010101000110101001000110100010100100000011111010101101010011010000100101000110111101101101000100111110011001011010001010011101111111011101011001110000110110111011100100001000100111001010101010111001100000001011001001011010100010001111111001110110111011001111101111011011010010011010101010110110101011111100011011011110100001010000101010100110010111001100111001110011110101110111011100010010111000101101010000000010010001101010011110000110110101110111111101000011011000000110010101011000010100100001111111100011111111001110001110111001000000111100101001100011111101001000110110010101110110011001110101000110101100000100100101100101010111010010011010010101010100000010100101011011111111001010000010001011111101111001110011100011000101000000100110100111010010011011001001101010100100100110010010010100011100110010000001010010011010100101111110110100001111010010100110101001011101110000010011111101111111110111100001010100010011111001001110010000010111001111101110000011110100010111000000100011100111100101000000111110101011101001001001011010110000110101001110101101001111100000011100010101000101110010011111100000001100010100000101001111000010000111000011111000100111100110110100110011001101011011100111110000001010111000000001011111111110011010101010010100101100110011011111100111110111111001011000110011010100110011011100101110111000101000100011000101110100110110100011100101100101010101011011000101011010010111011011010001111010001101000000010011010011010001011000110010100000011101100110111011000100101011110000001111110011000001011101100111110111010100010001000000100101010010111000110101001011001101000101000101111110100001000001101111111011110110011001011101000111000101011011110011111001100011100101010110000101111001011110010101010111010110011111011010001101111011000000101010101110101011011111110011010011111010010111000111000100000100011010001001011000000101110101101001011001011010011000111101110110100111001000111000011101101100110110111010111000000110001111001010000011111001001010100101001001011010110110111110011001101111101101110010100001100011100110000011110000000101010101110011010010011111100011111101010001010000000011001001111000010001000001100001101110101110000111100111110111110110001100011110010010110001010011110100001110101010111000100111111101011111100110011110111010011111010110001011000111011001110101100100111010011011001010110110010111010001110001101011110001001111100011100011000101001010100110111110110111110110101011101010100111001111110111101011010110001100000110100110000000101110001101100101010000000000101010000011110101000011110101010100000000111110101000001100000111010011011111110001010100101001011010001101110110111110100001011001100011001111001110101100100111101000000110011100110011010000001011001100010001111001011001100101100011110001001100101000101010000111111110110110101110001001011010110000011010011110101101110111010101001110011100110101111010010110110011111000001001111110101100111001011110111000110111110110001111010111101100110100101000000010000001000101111010000010101000111011101011001001011101110001011010011011111100100001010111001110010000101001110001110110011000101001101010011011010000110101011010111010110110011110101111110001111100101001010101000010011100100000001001011001111001111100101101111111101100110111110000001110001000010100011101010011111110101101011101101001110101111001010000110100001101101001001000001100010011001110101001001000111101111100001110010111110101000110010010000111000100110000101100010100111110000110010001010000011101101101100011010001000100010110101001000100010001000000000101010011000001110010010111011011111110101000110110010010100110010000100011010011100111011011110101110000001000110000100111011101100010000000100010111100001110110011010110110110100011011100101010010010011000001111000010100101101011000010100010010010000011100010110001001011100011111110010001100001100100010000011111101010110111110100001010110100001000100101110111101010111011011010100111111010011011100011110110101110011001100101110111111000000010001111110001000010111111000010111100100011001010100000001011001110101100100111001100110010010010101001001110100100001001110110111110000001110011101101001010110110111111110111000111010100001000000001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K2 = 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L1 = PT_Bin[0:n] R1 = PT_Bin[n::] f1 = exor(R1, K1) R2 = exor(f1, L1) L2 = R1 f2 = exor(R2, K2) R3 = exor(f2, L2) L3 = R2 R3 = 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L3 = 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cipher = L3 + R3 # decryption (redacted) plaintext = L6 + R6 plaintext = int(plaintext, 2) plaintext = binascii.unhexlify('%x' % plaintext) print(plaintext)
このコードからL3やR3とL1, R1の関係を導く。
f1 = R1 ^ K1 R2 = f1 ^ L1 = R1 ^ K1 ^ L1 L2 = R1 f2 = R2 ^ K2 = R1 ^ K1 ^ L1 ^ K2 R3 = f2 ^ L2 = R1 ^ K1 ^ L1 ^ K2 ^ R1 = K1 ^ L1 ^ K2 L3 = R2 = R1 ^ K1 ^ L1 → L1 = R3 ^ K1 ^ K2 R1 = L3 ^ K1 ^ L1
これでL1とR1を復号でき、さらにhexデコードする。
import binascii n = 26936 K1 = 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K2 = 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R3 = 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L3 = 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L1 = int(R3, 2) ^ int(K1, 2) ^ int(K2, 2) R1 = int(L3, 2) ^ int(K1, 2) ^ L1 L4 = binascii.unhexlify('%x' % L1) R4 = binascii.unhexlify('%x' % R1) plaintext = binascii.unhexlify(L4 + R4) print plaintext
実行結果は以下の通り。
33D32945 STP File, STP Format Version 1.0
SECTION Comment
Name "3k{almost_done_shizzle_up_my_nizzle}"
END
SECTION Graph
Nodes 144
Edges 116
E 1 2 1
E 2 3 1
E 3 5 1
E 4 5 1
E 6 8 1
E 7 8 1
E 8 9 1
E 8 10 1
E 11 12 1
E 13 14 1
E 13 15 1
E 15 16 1
E 14 16 1
E 15 17 1
E 18 20 1
E 19 20 1
E 20 21 1
E 22 23 1
E 23 24 1
E 24 25 1
E 25 26 1
E 27 28 1
E 28 29 1
E 29 30 1
E 30 31 1
E 32 33 1
E 33 34 1
E 34 35 1
E 36 37 1
E 36 38 1
E 38 39 1
E 38 40 1
E 40 41 1
E 42 43 1
E 44 45 1
E 44 46 1
E 46 47 1
E 46 48 1
E 49 50 1
E 49 51 1
E 50 52 1
E 51 53 1
E 53 54 1
E 52 54 1
E 55 56 1
E 57 58 1
E 57 59 1
E 59 60 1
E 61 62 1
E 60 62 1
E 63 65 1
E 64 66 1
E 65 66 1
E 65 67 1
E 66 68 1
E 69 70 1
E 70 71 1
E 70 72 1
E 72 74 1
E 73 74 1
E 74 75 1
E 76 77 1
E 77 78 1
E 78 79 1
E 79 80 1
E 81 82 1
E 82 83 1
E 83 84 1
E 84 85 1
E 86 87 1
E 87 88 1
E 88 89 1
E 90 91 1
E 90 92 1
E 92 93 1
E 92 94 1
E 94 95 1
E 96 97 1
E 98 101 1
E 99 101 1
E 98 100 1
E 99 102 1
E 100 103 1
E 102 104 1
E 105 107 1
E 106 107 1
E 107 108 1
E 109 110 1
E 111 113 1
E 111 114 1
E 112 115 1
E 113 116 1
E 114 117 1
E 115 117 1
E 118 119 1
E 119 120 1
E 119 121 1
E 121 123 1
E 122 123 1
E 123 124 1
E 125 126 1
E 126 127 1
E 127 128 1
E 128 129 1
E 130 131 1
E 131 132 1
E 132 133 1
E 133 134 1
E 135 136 1
E 136 137 1
E 137 138 1
E 139 140 1
E 139 141 1
E 141 142 1
E 141 143 1
E 143 144 1
END
SECTION Coordinates
DD 1 5 5
DD 2 55 5
DD 3 5 55
DD 4 5 105
DD 5 55 105
DD 6 65 5
DD 7 115 5
DD 8 65 55
DD 9 65 105
DD 10 115 105
DD 11 125 55
DD 12 175 55
DD 13 185 5
DD 14 235 5
DD 15 185 55
DD 16 235 55
DD 17 185 105
DD 18 245 5
DD 19 295 5
DD 20 270 55
DD 21 270 105
DD 22 355 5
DD 23 405 5
DD 24 380 55
DD 25 355 105
DD 26 405 105
DD 27 415 5
DD 28 465 5
DD 29 440 55
DD 30 415 105
DD 31 455 105
DD 32 475 5
DD 33 475 55
DD 34 475 105
DD 35 525 105
DD 36 535 5
DD 37 585 5
DD 38 535 55
DD 39 585 55
DD 40 535 105
DD 41 585 105
DD 42 595 105
DD 43 645 105
DD 44 655 5
DD 45 705 5
DD 46 655 55
DD 47 705 55
DD 48 655 105
DD 49 715 5
DD 50 765 5
DD 51 715 55
DD 52 765 55
DD 53 715 105
DD 54 765 105
DD 55 775 105
DD 56 825 105
DD 57 835 5
DD 58 885 5
DD 59 835 55
DD 60 885 55
DD 61 835 105
DD 62 885 105
DD 63 895 5
DD 64 945 5
DD 65 895 55
DD 66 945 55
DD 67 895 105
DD 68 945 105
DD 69 955 5
DD 70 980 5
DD 71 1005 5
DD 72 980 55
DD 73 955 105
DD 74 980 105
DD 75 1005 105
DD 76 1015 5
DD 77 1065 5
DD 78 1040 55
DD 79 1015 105
DD 80 1065 105
DD 81 1075 5
DD 82 1125 5
DD 83 1100 55
DD 84 1075 105
DD 85 1125 105
DD 86 1135 5
DD 87 1135 55
DD 88 1135 105
DD 89 1185 105
DD 90 1195 5
DD 91 1245 5
DD 92 1195 55
DD 93 1245 55
DD 94 1195 105
DD 95 1245 105
DD 96 1255 105
DD 97 1305 105
DD 98 1315 5
DD 99 1365 5
DD 100 1315 55
DD 101 1340 55
DD 102 1365 55
DD 103 1315 55
DD 104 1365 105
DD 105 1375 5
DD 106 1425 5
DD 107 1400 55
DD 108 1400 105
DD 109 1435 105
DD 110 1485 105
DD 111 1495 5
DD 112 1545 5
DD 113 1495 5
DD 114 1520 55
DD 115 1545 55
DD 116 1495 105
DD 117 1545 105
DD 118 1555 105
DD 119 1580 5
DD 120 1605 5
DD 121 1580 55
DD 122 1555 105
DD 123 1580 105
DD 124 1605 105
DD 125 1615 5
DD 126 1665 5
DD 127 1640 5
DD 128 1615 105
DD 129 1665 105
DD 130 1675 5
DD 131 1725 5
DD 132 1700 55
DD 133 1675 105
DD 134 1725 105
DD 135 1735 5
DD 136 1735 55
DD 137 1735 105
DD 138 1785 105
DD 139 1795 5
DD 140 1845 5
DD 141 1795 55
DD 142 1845 55
DD 143 1795 105
DD 144 1845 105
END
EOF
3k{almost_done_shizzle_up_my_nizzle}
