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@hyuki0000
Created April 5, 2014 07:24
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#!/usr/bin/ruby
def analyze(encrypted_hex)
guess = {
'CB' => ' ', # 'A',
'9C' => 'e', # 'B',
'BA' => 't', # 'C',
'DA' => 'o', # 'D',
'0D' => 's', # 'E',
'24' => 'n', # 'F',
'C2' => 'i', # 'G',
'F0' => 'a', # 'H',
'1C' => 'r', # 'I',
'97' => 'l', # 'J',
'CD' => 'c', # 'K',
'7D' => 'd', # 'L',
'F9' => 'f', # 'M',
'4D' => 'h', # 'N',
'58' => 'u', # 'O',
'3F' => 'p', # 'P',
'21' => ',', # 'Q',
'2C' => 'y', # 'R',
'08' => 'g', # 'S',
'E4' => 'm', # 'T',
'D3' => 'b', # 'U',
'25' => '-', # 'V',
'07' => 'w', # 'W',
'78' => '"', # 'X',
'A9' => 'k', # 'Y',
'50' => '.', # 'Z',
'7F' => 'v', # '0',
'88' => 'N', # '1',
'C5' => '\'', # '2',
'B7' => 'I', # '3',
'AB' => 'Y', # '4',
'CE' => 'W', # '5',
'AC' => 'O', # '6',
'9D' => 'T', # '7',
}
count = Hash.new(0)
encrypted_hex.split(/\s+/).each do |h|
count[h] += 1
g = guess[h]
print g
end
puts
end
THECODE = <<"EOD"
78 AB DA 58 CB 0D 9C 9C 21 CB E4 2C CB 7D 9C F0
1C CB CE F0 BA 0D DA 24 21 78 CB 25 25 CB 4D 9C
CB 3F 1C DA 3F 3F 9C 7D CB 4D C2 0D CB BA 9C 0D
BA 25 BA 58 D3 9C CB C2 24 CB BA 4D 9C CB 1C F0
CD A9 21 CB F0 24 7D CB D3 9C 08 F0 24 CB BA DA
CB 97 9C CD BA 58 1C 9C CB 07 C2 BA 4D CB BA 4D
9C CB F0 C2 1C CB DA F9 CB F0 CB 3F 1C DA F9 9C
0D 0D DA 1C CB F0 7D 7D 1C 9C 0D 0D C2 24 08 CB
4D C2 0D CB CD 97 F0 0D 0D CB 25 25 CB 78 C2 BA
CB C2 0D CB 24 DA BA CB 1C 9C F0 97 97 2C CB 7D
C2 F9 F9 C2 CD 58 97 BA CB BA DA CB CD DA 24 0D
BA 1C 58 CD BA CB F0 CB 0D 9C 1C C2 9C 0D CB DA
F9 CB C2 24 F9 9C 1C 9C 24 CD 9C 0D 21 CB 9C F0
CD 4D CB 7D 9C 3F 9C 24 7D 9C 24 BA CB 58 3F DA
24 CB C2 BA 0D CB 3F 1C 9C 7D 9C CD 9C 0D 0D DA
1C CB F0 24 7D CB 9C F0 CD 4D CB 0D C2 E4 3F 97
9C CB C2 24 CB C2 BA 0D 9C 97 F9 50 CB CB B7 F9
21 CB F0 F9 BA 9C 1C CB 7D DA C2 24 08 CB 0D DA
21 CB DA 24 9C CB 0D C2 E4 3F 97 2C CB A9 24 DA
CD A9 0D CB DA 58 BA CB F0 97 97 CB BA 4D 9C CB
CD 9C 24 BA 1C F0 97 CB C2 24 F9 9C 1C 9C 24 CD
9C 0D CB F0 24 7D CB 3F 1C 9C 0D 9C 24 BA 0D CB
DA 24 9C C5 0D CB F0 58 7D C2 9C 24 CD 9C CB 07
C2 BA 4D CB BA 4D 9C CB 0D BA F0 1C BA C2 24 08
25 3F DA C2 24 BA CB F0 24 7D CB BA 4D 9C CB CD
DA 24 CD 97 58 0D C2 DA 24 21 CB DA 24 9C CB E4
F0 2C CB 3F 1C DA 7D 58 CD 9C CB F0 CB 0D BA F0
1C BA 97 C2 24 08 21 CB BA 4D DA 58 08 4D CB 3F
DA 0D 0D C2 D3 97 2C CB F0 CB E4 9C 1C 9C BA 1C
C2 CD C2 DA 58 0D 21 CB 9C F9 F9 9C CD BA 50 CB
88 DA 07 21 CB C2 BA CB 07 F0 0D CB 24 DA BA CB
1C 9C F0 97 97 2C CB 7D C2 F9 F9 C2 CD 58 97 BA
21 CB D3 2C CB F0 24 CB C2 24 0D 3F 9C CD BA C2
DA 24 CB DA F9 CB BA 4D 9C CB 08 1C DA DA 7F 9C
CB D3 9C BA 07 9C 9C 24 CB 2C DA 58 1C CB 97 9C
F9 BA CB F9 DA 1C 9C F9 C2 24 08 9C 1C CB F0 24
7D CB BA 4D 58 E4 D3 21 CB BA DA CB F9 9C 9C 97
CB 0D 58 1C 9C CB BA 4D F0 BA CB 2C DA 58 CB 7D
C2 7D CB 88 AC 9D CB 3F 1C DA 3F DA 0D 9C CB BA
DA CB C2 24 7F 9C 0D BA CB 2C DA 58 1C CB 0D E4
F0 97 97 CB CD F0 3F C2 BA F0 97 CB C2 24 CB BA
4D 9C CB 08 DA 97 7D CB F9 C2 9C 97 7D 0D 50 78
EOD
analyze(THECODE)
require 'digest'
THECODE =<<"EOD"
C8 EE A8 0F 80 FD 60 E9 00 3F C4 B0 10 2C E7 33
DC 82 1E 6B D3 5B BB FA 8A 48 C2 F0 97 7F A6 C0
9C 32 15 89 37 51 AA C9 D8 93 9D 86 DA 28 BB 58
A2 6D E2 7F 3A 3B A5 F1 A5 31 89 6C D8 B5 E6 15
EOD
(0..255).each do |seed|
printf("seed = %02X", seed)
sha = Digest::SHA1.new
decoded_text = ''
THECODE.split(/\s+/).each do |cc|
code = cc.hex
decoded = code ^ seed
if (decoded >= 0x7f) or (decoded < 0x20 and decoded != 0x09)
break
else
decoded_text += decoded.chr
end
sha.update(seed.chr)
seed = sha.digest.split(//)[19].ord
end
if decoded_text.length > 10
printf(", decoded_text = %s...\n", decoded_text)
else
puts
end
end
#!/usr/bin/ruby
def cipher(plain_text, seed, mode = :encrypt)
rng = Random.new(seed)
sbox = (0..255).to_a.shuffle(random: rng)
if mode == :decrypt
rbox = []
sbox.each_with_index { |n,i| rbox[n] = i }
sbox = rbox
end
encrypted_text = ''
plain_text.split(//).each do |c|
plain = c.ord
encrypted = sbox[plain]
printf("%02X -> %02X (seed = %02X)\n", plain, encrypted, seed) if $DEBUG
encrypted_text += encrypted.chr
end
encrypted_text
end
def encrypt_tohex(plain_text, seed)
hex = ''
cipher(plain_text, seed).split(//).each_with_index do |c,i|
hex += sprintf("%02X", c.ord)
if i % 16 == 15
hex += "\n"
else
hex += " "
end
end
hex += "\n"
hex
end
def decrypt_fromhex(encrypted_hex, seed)
encrypted_text = ''
encrypted_hex.split(/\s+/).each do |h|
encrypted_text += h.hex.chr
end
cipher(encrypted_text, seed, :decrypt)
end
PLAIN_TEXT = %Q("You see, my dear Watson," -- he propped his test-tube in the rack, and began to lecture with the air of a professor addressing his class -- "it is not really difficult to construct a series of inferences, each dependent upon its predecessor and each simple in itself. If, after doing so, one simply knocks out all the central inferences and presents one's audience with the starting-point and the conclusion, one may produce a startling, though possibly a meretricious, effect. Now, it was not really difficult, by an inspection of the groove between your left forefinger and thumb, to feel sure that you did NOT propose to invest your small capital in the gold fields.")
print encrypt_tohex(PLAIN_TEXT, 123)
THECODE = <<"EOD"
78 AB DA 58 CB 0D 9C 9C 21 CB E4 2C CB 7D 9C F0
1C CB CE F0 BA 0D DA 24 21 78 CB 25 25 CB 4D 9C
CB 3F 1C DA 3F 3F 9C 7D CB 4D C2 0D CB BA 9C 0D
BA 25 BA 58 D3 9C CB C2 24 CB BA 4D 9C CB 1C F0
CD A9 21 CB F0 24 7D CB D3 9C 08 F0 24 CB BA DA
CB 97 9C CD BA 58 1C 9C CB 07 C2 BA 4D CB BA 4D
9C CB F0 C2 1C CB DA F9 CB F0 CB 3F 1C DA F9 9C
0D 0D DA 1C CB F0 7D 7D 1C 9C 0D 0D C2 24 08 CB
4D C2 0D CB CD 97 F0 0D 0D CB 25 25 CB 78 C2 BA
CB C2 0D CB 24 DA BA CB 1C 9C F0 97 97 2C CB 7D
C2 F9 F9 C2 CD 58 97 BA CB BA DA CB CD DA 24 0D
BA 1C 58 CD BA CB F0 CB 0D 9C 1C C2 9C 0D CB DA
F9 CB C2 24 F9 9C 1C 9C 24 CD 9C 0D 21 CB 9C F0
CD 4D CB 7D 9C 3F 9C 24 7D 9C 24 BA CB 58 3F DA
24 CB C2 BA 0D CB 3F 1C 9C 7D 9C CD 9C 0D 0D DA
1C CB F0 24 7D CB 9C F0 CD 4D CB 0D C2 E4 3F 97
9C CB C2 24 CB C2 BA 0D 9C 97 F9 50 CB CB B7 F9
21 CB F0 F9 BA 9C 1C CB 7D DA C2 24 08 CB 0D DA
21 CB DA 24 9C CB 0D C2 E4 3F 97 2C CB A9 24 DA
CD A9 0D CB DA 58 BA CB F0 97 97 CB BA 4D 9C CB
CD 9C 24 BA 1C F0 97 CB C2 24 F9 9C 1C 9C 24 CD
9C 0D CB F0 24 7D CB 3F 1C 9C 0D 9C 24 BA 0D CB
DA 24 9C C5 0D CB F0 58 7D C2 9C 24 CD 9C CB 07
C2 BA 4D CB BA 4D 9C CB 0D BA F0 1C BA C2 24 08
25 3F DA C2 24 BA CB F0 24 7D CB BA 4D 9C CB CD
DA 24 CD 97 58 0D C2 DA 24 21 CB DA 24 9C CB E4
F0 2C CB 3F 1C DA 7D 58 CD 9C CB F0 CB 0D BA F0
1C BA 97 C2 24 08 21 CB BA 4D DA 58 08 4D CB 3F
DA 0D 0D C2 D3 97 2C CB F0 CB E4 9C 1C 9C BA 1C
C2 CD C2 DA 58 0D 21 CB 9C F9 F9 9C CD BA 50 CB
88 DA 07 21 CB C2 BA CB 07 F0 0D CB 24 DA BA CB
1C 9C F0 97 97 2C CB 7D C2 F9 F9 C2 CD 58 97 BA
21 CB D3 2C CB F0 24 CB C2 24 0D 3F 9C CD BA C2
DA 24 CB DA F9 CB BA 4D 9C CB 08 1C DA DA 7F 9C
CB D3 9C BA 07 9C 9C 24 CB 2C DA 58 1C CB 97 9C
F9 BA CB F9 DA 1C 9C F9 C2 24 08 9C 1C CB F0 24
7D CB BA 4D 58 E4 D3 21 CB BA DA CB F9 9C 9C 97
CB 0D 58 1C 9C CB BA 4D F0 BA CB 2C DA 58 CB 7D
C2 7D CB 88 AC 9D CB 3F 1C DA 3F DA 0D 9C CB BA
DA CB C2 24 7F 9C 0D BA CB 2C DA 58 1C CB 0D E4
F0 97 97 CB CD F0 3F C2 BA F0 97 CB C2 24 CB BA
4D 9C CB 08 DA 97 7D CB F9 C2 9C 97 7D 0D 50 78
EOD
puts decrypt_fromhex(THECODE, 123)
#!/usr/bin/ruby
require 'digest'
def cipher(plain_text, seed)
encrypted_text = ''
seed = seed % 256
sha1 = Digest::SHA1.new
plain_text.split(//).each do |c|
plain = c.ord
encrypted = plain ^ seed
printf("%02X -> %02X (seed = %02X)\n", plain, encrypted, seed) if $DEBUG
encrypted_text += encrypted.chr
sha1.update(seed.chr)
seed = sha1.digest.split(//)[19].ord
end
encrypted_text
end
def encrypt_tohex(plain_text, seed)
hex = ''
cipher(plain_text, seed).split(//).each_with_index do |c,i|
hex += sprintf("%02X", c.ord)
if i % 16 == 15
hex += "\n"
else
hex += " "
end
end
hex += "\n"
hex
end
def decrypt_fromhex(encrypted_hex, seed)
encrypted_text = ''
encrypted_hex.split(/\s+/).each do |h|
encrypted_text += h.hex.chr
end
cipher(encrypted_text, seed)
end
PLAIN_TEXT = %Q("If you use the code which I have explained," said Holmes,"you will find that it simply means 'Come here at once.' I was convinced that it was an invitation which he would not refuse, since he could never imagine that it could come from anyone but the lady. And so, my dear Watson, we have ended by turning the dancing men to good when they have so often been the agents of evil, and I think that I have fulfilled my promise of giving you something unusual for your notebook. Three-forty is our train, and I fancy we should be back in Baker Street for dinner.")
print encrypt_tohex(PLAIN_TEXT, 234)
THECODE = <<"EOD"
C8 EE A8 0F 80 FD 60 E9 00 3F C4 B0 10 2C E7 33
DC 82 1E 6B D3 5B BB FA 8A 48 C2 F0 97 7F A6 C0
9C 32 15 89 37 51 AA C9 D8 93 9D 86 DA 28 BB 58
A2 6D E2 7F 3A 3B A5 F1 A5 31 89 6C D8 B5 E6 15
BC A4 BC 59 93 CD 68 85 52 48 93 36 B1 F4 5E FA
D1 62 7C 4B C1 A2 E4 98 7F 17 D5 21 37 7F C5 A0
2C BE 67 4D DC 5A 0B 66 D9 D4 5B 09 58 2F 72 ED
4F 45 81 36 73 AB 18 DF 51 5C 1A D3 7F 2E EF B8
D8 C8 C0 8A 4C BA 87 23 01 44 46 E7 03 42 EF 44
EA 05 36 11 3C 03 67 24 A4 BC 53 EF 6E 2D C3 66
B9 CF 9C C2 55 04 9C F8 F4 99 B8 AF FF EA 16 7D
AA EC FF 7D E2 52 8B B7 65 EE 2C 69 07 1D D9 14
C5 5A 6B 5A BC EF 34 12 C4 0D 7D 4E AA DD 19 0A
2B 5F 8B CE 06 2D A0 6C 76 49 E2 62 AC 4B 04 46
FA E6 58 3E D0 7B 58 F0 8A 9E 67 1B 96 3C B3 93
94 66 8A 44 50 D5 4F F8 49 33 4E BA CA E1 95 24
92 43 85 FC A8 B1 66 6F 46 57 BD A5 B3 1E 1B 47
5B 95 EB E7 8C 41 25 DC 88 9D 66 72 36 6B C1 D8
E8 60 59 BA 1F BD 66 A7 3C A3 1D 08 DE CF EB 02
10 90 FD 9A F9 51 83 6C 22 79 6F 79 D7 98 52 43
DD 1E 66 AB E1 F0 E2 E4 85 0D 5F E5 B9 83 07 E0
84 9C B8 3A 60 1E 00 31 8B E9 7B 9B 6E 56 F0 84
81 A7 AE AE BE B2 56 0A C3 B8 DE B8 5C 8A 09 83
4C 9F 12 D3 DE C2 08 F2 79 CF 71 51 B3 E5 F0 D2
47 12 0E DF 98 B2 5C 02 E7 E3 4D B3 6B 20 91 0D
7C 0E E2 95 2E 7A 29 E2 7C C0 A8 9A B6 25 C1 FB
E5 EB A5 A0 F6 E2 E6 A0 70 4E E5 8F DE 1E 9C 33
29 2F DA 85 E0 9A C2 F6 6F 71 A9 84 E7 F9 61 29
50 3A 0A 65 C3 BD 91 CC 7E 52 69 84 12 27 6C 97
0C 9C FC 60 32 58 7D BD 2E 4F 5A 36 97 ED 34 5A
35 2F A8 ED DC A0 67 F0 FE 17 C9 E0 6E D6 D1 9D
58 C2 E0 81 6F C1 7F E9 38 5C EC 5A 30 08 00 CB
C3 65 2F A9 78 6D F5 C0 D1 34 8E 99 C8 52 85 E4
F7 06 FD E7 1B 14 9F 97 BD D9 97 29 18 8A 2A E4
76 AA 36 2D CE 4E E4 D0 84 69 65 22 0C 9B A4 42
EOD
# (0..255).each do |key|
# puts "#{key} : " + decrypt_fromhex(THECODE, key)
# end
puts decrypt_fromhex(THECODE, 234)
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