[Inori]

Back when I started programming Ruby, I made an encryption program named halcyon. It was really bulky and not all that efficient. Since I haven't made any release threads in a while, I decided to remake it as a command line tool.

Syntax/Usage:

---

Code:

ruby Halcyon2.rb <filename> <e|d>

an example would be:

Code:

ruby Halcyon2.rb test.txt e

the e and d simply stand for Encrypt and Decrypt. When executed, Halcyon overwrites the file with the encrypted or decrypted message.

Sample I/O:
Input:

Code:

test123

Output:

Code:

620APT08H2QV620AUHWXS9M0QVBZ

The true beauty of Halcyon lies in it's simplicity. It follows no algorithms, but instead reads directly from the keys hash. Without the Halcyon2 file, it's practically impossible to decrypt messages(unless you do something idiotic like write a sign-off like the Nazis. Terrible waste of effort with Enigma).

Source Code:

Spoiler: V2.0

Code:

processed = [] keys = { "a" => "86L2", "b" => "O9FU", "c" => "DGC9", "d" => "72JE", "e" => "PT08", "f" => "L1WN", "g" => "ZBRX", "h" => "33C6", "i" => "FB2M", "j" => "0LJW", "k" => "F6I2", "l" => "AJJ5", "m" => "EVET", "n" => "0SHX", "o" => "8PUV", "p" => "TSVW", "q" => "XHLV", "r" => "K45G", "s" => "H2QV", "t" => "620A", "u" => "LY1E", "v" => "XEJ4", "w" => "W8UN", "x" => "RKJA", "y" => "R06K", "z" => "32ZG", "0" => "P1E1", "1" => "UHWX", "2" => "S9M0", "3" => "QVBZ", "4" => "S13P", "5" => "I3KN", "6" => "IK9O", "7" => "8WGY", "8" => "ACXY", "9" => "NGNY", " " => "FUH3" } if ARGV[1] == "e" file = File.read(ARGV[0]).each_char { |c| c = keys[c] processed << c } output = File.open(ARGV[0], "w") output << processed.join("") elsif ARGV[1] == "d" file = File.read(ARGV[0]).scan(/.{4}/).each { |c| c = keys.key(c) processed << c } output = File.open(ARGV[0], "w") output << processed.join("") end

Spoiler: V2.1

Code:

processed = [] keys = { "a" => "x1PMUle1YZ", "b" => "cM8ezAO4mT", "c" => "skdirR0oI9", "d" => "IdxGznRoIZ", "e" => "ZW0f35X4mS", "f" => "zZCGnyLltR", "g" => "6H8dxPoZZQ", "h" => "lBtkPHsWMX", "i" => "pMfx9g454h", "j" => "ArXZoTVTqJ", "k" => "UDgNZ2qW6I", "l" => "NG3x9cz3gq", "m" => "frEGyWgMDQ", "n" => "NETk9nxJwh", "o" => "1UqQM6GzQT", "p" => "LL0Sz98mLz", "q" => "yeQ30rQXq5", "r" => "ZbpBptRJ0s", "s" => "hMvCoFWLwb", "t" => "26Xgy6cWx3", "u" => "P26SpuVXZB", "v" => "UHZPZ79j7P", "w" => "EqMuFaylXs", "x" => "lxHtXkhaS9", "y" => "NuHrkdtlvv", "z" => "xK3QaLxhRC", "0" => "2IkGJVc3sj", "1" => "p6Ncbj5W5I", "2" => "C21jtUbZm6", "3" => "eGCtWDWp1d", "4" => "mwrt8xGm9L", "5" => "TjI891ggrI", "6" => "7WVrc06BP8", "7" => "Qiphkiq110", "8" => "RxULizlNli", "9" => "AhYI8vPlRu", "\." => "ZBa17n60A7", "\," => "XZZEslsZIR", "\'" => "p51BTqm9uq", "\\" => "qEKnsFAKoy", "\/" => "cSX1m4CK6K", "\[" => "OJ8LBUiq1a", "\]" => "iHUUKANMK1", "\-" => "u5A9wbEUTe", "\_" => "6VH868pKWU", "\+" => "MYmroEEL1X", "\=" => "L70NPBI5Ed", "\?" => "g31VmAgjUp", "\!" => "OMTU9kQeuG", "\#" => "HqZefstFCE", "\&" => "WvBZWl1lAd", "\n" => "lV0031YeaP", "\t" => "XaWpcKU6nF" } if ARGV[1] == "e" file = File.read(ARGV[0]).each_char { |c| c = keys[c] processed << c } output = File.open(ARGV[0], "w") output << processed.join("").reverse elsif ARGV[1] == "d" file = File.read(ARGV[0]).scan(/.{10}/).each { |c| c = keys.key(c) processed << c } output = File.open(ARGV[0], "w") output << processed.join("").reverse end

Spoiler: V2.2

Code:

processed = [] keys = { "a" => "x1PMUle1YZ", "b" => "cM8ezAO4mT", "c" => "skdirR0oI9", "d" => "IdxGznRoIZ", "e" => "ZW0f35X4mS", "f" => "zZCGnyLltR", "g" => "6H8dxPoZZQ", "h" => "lBtkPHsWMX", "i" => "pMfx9g454h", "j" => "ArXZoTVTqJ", "k" => "UDgNZ2qW6I", "l" => "NG3x9cz3gq", "m" => "frEGyWgMDQ", "n" => "NETk9nxJwh", "o" => "1UqQM6GzQT", "p" => "LL0Sz98mLz", "q" => "yeQ30rQXq5", "r" => "ZbpBptRJ0s", "s" => "hMvCoFWLwb", "t" => "26Xgy6cWx3", "u" => "P26SpuVXZB", "v" => "UHZPZ79j7P", "w" => "EqMuFaylXs", "x" => "lxHtXkhaS9", "y" => "NuHrkdtlvv", "z" => "xK3QaLxhRC", "0" => "2IkGJVc3sj", "1" => "p6Ncbj5W5I", "2" => "C21jtUbZm6", "3" => "eGCtWDWp1d", "4" => "mwrt8xGm9L", "5" => "TjI891ggrI", "6" => "7WVrc06BP8", "7" => "Qiphkiq110", "8" => "RxULizlNli", "9" => "AhYI8vPlRu", " " => "C4fG3EsdSq", "\." => "ZBa17n60A7", "\," => "XZZEslsZIR", "\'" => "p51BTqm9uq", "\\" => "qEKnsFAKoy", "\/" => "cSX1m4CK6K", "\[" => "OJ8LBUiq1a", "\]" => "iHUUKANMK1", "\-" => "u5A9wbEUTe", "\_" => "6VH868pKWU", "\+" => "MYmroEEL1X", "\=" => "L70NPBI5Ed", "\?" => "g31VmAgjUp", "\!" => "OMTU9kQeuG", "\#" => "HqZefstFCE", "\&" => "WvBZWl1lAd", "\n" => "lV0031YeaP", "\t" => "XaWpcKU6nF" } keys.default = "" fakes = ["DcJEwb4Ftx", "eI1hFDxGHk", "POR1fbLBd4"] rand = *(0..9) if ARGV[1] == "e" file = File.read(ARGV[0]).each_char { |c| c = keys[c] processed << c processed << fakes.sample if rand.sample % 3 == 0 } output = File.open(ARGV[0], "w") output << processed.reverse.join("") elsif ARGV[1] == "d" file = File.read(ARGV[0]).scan(/.{10}/).each { |c| c = keys.key(c) processed << c } output = File.open(ARGV[0], "w") output << processed.reverse.join("") end

GitHub Gist here.

[Reiko]

Please redefine the hashtable and encrypt a message and I will cryptanalyze your cipher. This is not safe and I will prove it.

For good proof of concept, please provide an English-language phrase with 5 or more words. Preferably not more than 30.

[Inori]

Since @Reiko cracked it, I'm updating the code to be a little more advanced

[Tirus]

Nice job, @Reiko. Seems neat. Good work kiddo.

IM GAY DAD

[Reiko]

I guess I'll do a short writeup on cracking this in its current form.. it's a little bit more than a basic substitution cipher and I have to give credit for tripping up EVERY SINGLE ONLINE FREQUENCY ANALYSIS TOOL.

[Crypt]

I'm so confused.. how is this possibly called an encryption program? This is just taking provided input and modifying each individual character into a static alternate set of characters in the table set for that provided character. What would you even use this for? "Encrypting" some text/program that nobody would even be able to read unless they had this specific program seems beyond useless to me. I'm not bashing on your programming skills, it just seems like downloading and using this program would be a waste of storage space and time. Even using some simple ass OpenSSL::Cipher encryption program would be better.

[Inori]

I'm so confused.. how is this possibly called an encryption program? This is just taking provided input and modifying each individual character into a static alternate set of characters in the table set for that provided character. What would you even use this for? "Encrypting" some text/program that nobody would even be able to read unless they had this specific program seems beyond useless to me. I'm not bashing on your programming skills, it just seems like downloading and using this program would be a waste of storage space and time. Even using some simple ass OpenSSL::Cipher encryption program would be better.

You're not entirely wrong, but it's good as a project. And it's obviously customizable by changing the scan length and keys. This isn't the final product yet, but you're right in saying that it's not the best out there.

[Reiko]

snipped truth

It's classical crypto and it's interesting. Modern crypto beats it by millions of orders of magnitude and everyone knows that. I'm just having fun with breaking it and having @Chitoge improve on it.

As for "needing this specific program to read it", that's not the case at all. I managed to obtain plaintext without using any known key.

[Inori]

I managed to obtain plaintext without using any known key.

Hush. Nobody needs to know about that. (plus that was 2.0, I've improved it at least sixfold)