commit 7e45984f5d7831f5487e15bf4a5f057e0f687a9a
Author: poprhythm <james.kolpack@gmail.com>
Date:   Sat May 9 03:10:12 2026 +0000

    Initial commit — Coursera Cryptography I coursework

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6a6fff1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+bin/
+obj/
+*.suo
+*.v11.suo
+*.user
+.vs/
diff --git a/1_ManyTimePad.fs b/1_ManyTimePad.fs
new file mode 100644
index 0000000..a3dfbb3
--- /dev/null
+++ b/1_ManyTimePad.fs
@@ -0,0 +1,25 @@
+module _1_ManyTimePad
+
+let ctStrings = [|
+    "315c4eeaa8b5f8aaf9174145bf43e1784b8fa00dc71d885a804e5ee9fa40b16349c146fb778cdf2d3aff021dfff5b403b510d0d0455468aeb98622b137dae857553ccd8883a7bc37520e06e515d22c954eba5025b8cc57ee59418ce7dc6bc41556bdb36bbca3e8774301fbcaa3b83b220809560987815f65286764703de0f3d524400a19b159610b11ef3e"
+    "234c02ecbbfbafa3ed18510abd11fa724fcda2018a1a8342cf064bbde548b12b07df44ba7191d9606ef4081ffde5ad46a5069d9f7f543bedb9c861bf29c7e205132eda9382b0bc2c5c4b45f919cf3a9f1cb74151f6d551f4480c82b2cb24cc5b028aa76eb7b4ab24171ab3cdadb8356f"
+    "32510ba9a7b2bba9b8005d43a304b5714cc0bb0c8a34884dd91304b8ad40b62b07df44ba6e9d8a2368e51d04e0e7b207b70b9b8261112bacb6c866a232dfe257527dc29398f5f3251a0d47e503c66e935de81230b59b7afb5f41afa8d661cb"
+    "32510ba9aab2a8a4fd06414fb517b5605cc0aa0dc91a8908c2064ba8ad5ea06a029056f47a8ad3306ef5021eafe1ac01a81197847a5c68a1b78769a37bc8f4575432c198ccb4ef63590256e305cd3a9544ee4160ead45aef520489e7da7d835402bca670bda8eb775200b8dabbba246b130f040d8ec6447e2c767f3d30ed81ea2e4c1404e1315a1010e7229be6636aaa"
+    "3f561ba9adb4b6ebec54424ba317b564418fac0dd35f8c08d31a1fe9e24fe56808c213f17c81d9607cee021dafe1e001b21ade877a5e68bea88d61b93ac5ee0d562e8e9582f5ef375f0a4ae20ed86e935de81230b59b73fb4302cd95d770c65b40aaa065f2a5e33a5a0bb5dcaba43722130f042f8ec85b7c2070"
+    "32510bfbacfbb9befd54415da243e1695ecabd58c519cd4bd2061bbde24eb76a19d84aba34d8de287be84d07e7e9a30ee714979c7e1123a8bd9822a33ecaf512472e8e8f8db3f9635c1949e640c621854eba0d79eccf52ff111284b4cc61d11902aebc66f2b2e436434eacc0aba938220b084800c2ca4e693522643573b2c4ce35050b0cf774201f0fe52ac9f26d71b6cf61a711cc229f77ace7aa88a2f19983122b11be87a59c355d25f8e4"
+    "32510bfbacfbb9befd54415da243e1695ecabd58c519cd4bd90f1fa6ea5ba47b01c909ba7696cf606ef40c04afe1ac0aa8148dd066592ded9f8774b529c7ea125d298e8883f5e9305f4b44f915cb2bd05af51373fd9b4af511039fa2d96f83414aaaf261bda2e97b170fb5cce2a53e675c154c0d9681596934777e2275b381ce2e40582afe67650b13e72287ff2270abcf73bb028932836fbdecfecee0a3b894473c1bbeb6b4913a536ce4f9b13f1efff71ea313c8661dd9a4ce"
+    "315c4eeaa8b5f8bffd11155ea506b56041c6a00c8a08854dd21a4bbde54ce56801d943ba708b8a3574f40c00fff9e00fa1439fd0654327a3bfc860b92f89ee04132ecb9298f5fd2d5e4b45e40ecc3b9d59e9417df7c95bba410e9aa2ca24c5474da2f276baa3ac325918b2daada43d6712150441c2e04f6565517f317da9d3"
+    "271946f9bbb2aeadec111841a81abc300ecaa01bd8069d5cc91005e9fe4aad6e04d513e96d99de2569bc5e50eeeca709b50a8a987f4264edb6896fb537d0a716132ddc938fb0f836480e06ed0fcd6e9759f40462f9cf57f4564186a2c1778f1543efa270bda5e933421cbe88a4a52222190f471e9bd15f652b653b7071aec59a2705081ffe72651d08f822c9ed6d76e48b63ab15d0208573a7eef027"
+    "466d06ece998b7a2fb1d464fed2ced7641ddaa3cc31c9941cf110abbf409ed39598005b3399ccfafb61d0315fca0a314be138a9f32503bedac8067f03adbf3575c3b8edc9ba7f537530541ab0f9f3cd04ff50d66f1d559ba520e89a2cb2a83"
+    |]
+
+let targetString =
+    "32510ba9babebbbefd001547a810e67149caee11d945cd7fc81a05e9f85aac650e9052ba6a8cd8257bf14d13e6f0a803b54fde9e77472dbff89d71b57bddef121336cb85ccb8f3315f4b52e301d16e9f52f904"
+
+let strXor a b = 
+    Seq.zip a b
+    |> Seq.map (fun (a, b) -> byte(a) ^^^ byte(b))
+    |> Seq.map (fun b -> char(b))
+
+let decipher =
+    strXor ctStrings.[0] ctStrings.[1]
diff --git a/App.config b/App.config
new file mode 100644
index 0000000..04dad73
--- /dev/null
+++ b/App.config
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
+    </startup>
+    <runtime>
+      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+        <dependentAssembly>
+          <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
+          <bindingRedirect oldVersion="4.0.0.0" newVersion="4.3.0.0"/>
+          <bindingRedirect oldVersion="2.3.5.0" newVersion="4.3.0.0"/>
+          <bindingRedirect oldVersion="2.0.0.0" newVersion="4.3.0.0"/>
+          
+        </dependentAssembly>
+      </assemblyBinding>
+    </runtime>	
+</configuration>
\ No newline at end of file
diff --git a/Coursera_Cryptography1.fsproj b/Coursera_Cryptography1.fsproj
new file mode 100644
index 0000000..3ffd518
--- /dev/null
+++ b/Coursera_Cryptography1.fsproj
@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>0844e1fa-bfe8-4ba3-866c-6db7c0e07b41</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>Coursera_Cryptography1</RootNamespace>
+    <AssemblyName>Coursera_Cryptography1</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <Name>Coursera_Cryptography1</Name>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <Tailcalls>false</Tailcalls>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <WarningLevel>3</WarningLevel>
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DocumentationFile>bin\Debug\Coursera_Cryptography1.XML</DocumentationFile>
+    <Prefer32Bit>true</Prefer32Bit>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <Tailcalls>true</Tailcalls>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <WarningLevel>3</WarningLevel>
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DocumentationFile>bin\Release\Coursera_Cryptography1.XML</DocumentationFile>
+    <Prefer32Bit>true</Prefer32Bit>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="mscorlib" />
+    <Reference Include="FSharp.Core, Version=4.3.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Numerics" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="1_ManyTimePad.fs" />
+    <Compile Include="Program.fs" />
+    <None Include="App.config" />
+  </ItemGroup>
+  <PropertyGroup>
+    <MinimumVisualStudioVersion Condition="'$(MinimumVisualStudioVersion)' == ''">11</MinimumVisualStudioVersion>
+  </PropertyGroup>
+  <Import Project="$(MSBuildExtensionsPath32)\..\Microsoft SDKs\F#\3.0\Framework\v4.0\Microsoft.FSharp.Targets" Condition=" Exists('$(MSBuildExtensionsPath32)\..\Microsoft SDKs\F#\3.0\Framework\v4.0\Microsoft.FSharp.Targets')" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>
\ No newline at end of file
diff --git a/Coursera_Cryptography1.sln b/Coursera_Cryptography1.sln
new file mode 100644
index 0000000..277f536
--- /dev/null
+++ b/Coursera_Cryptography1.sln
@@ -0,0 +1,20 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "Coursera_Cryptography1", "Coursera_Cryptography1.fsproj", "{0844E1FA-BFE8-4BA3-866C-6DB7C0E07B41}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{0844E1FA-BFE8-4BA3-866C-6DB7C0E07B41}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0844E1FA-BFE8-4BA3-866C-6DB7C0E07B41}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0844E1FA-BFE8-4BA3-866C-6DB7C0E07B41}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0844E1FA-BFE8-4BA3-866C-6DB7C0E07B41}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
diff --git a/Program.fs b/Program.fs
new file mode 100644
index 0000000..b0af58d
--- /dev/null
+++ b/Program.fs
@@ -0,0 +1,7 @@
+// Learn more about F# at http://fsharp.net
+// See the 'F# Tutorial' project for more help.
+
+[<EntryPoint>]
+let main argv = 
+    printfn "%A" _1_ManyTimePad.decipher
+    0 // return an integer exit code