final commit

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-19">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Piegenere</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

.settings/org.eclipse.core.resources.prefs

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+eclipse.preferences.version=1
+encoding/<project>=UTF-8

.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=19
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=19
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=19

src/main/Main.java

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+package main;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class Main {
+	public static String PIE;
+	public static void main(String[] args) throws IOException {
+		PIE = Files.readString(new File("Resources/pi_E6.txt").toPath()).replaceAll("[^0-9]", "");
+		String text = Files.readString(new File("Resources/Goethe--Faust.txt").toPath()).toUpperCase().replaceAll("[^A-Z]", "");
+		String[] piegenereKey = new String[] { "SDF", "JA", "HJZR", "M", "HTASBOATC", "NAFARTZQ", "FAFVB", "AF", "QDOP",
+				"VCXY" };
+
+		System.out.println("Orginal: \n" + text);
+		String encrypted = viegenere(text, createViegenereKey(text.length(), piegenereKey), false);
+		System.out.println("verschlüsselt: \n" + encrypted);
+		System.out.println(
+				"entschlüsselt \n" + viegenere(encrypted, createViegenereKey(text.length(), piegenereKey), true));
+		Files.writeString(Path.of("Resources/Goethe--FaustEncrypted.txt"), encrypted);
+		System.out.println(text.length() + "/" + encrypted.length());
+	}
+
+	public static String createViegenereKey(int length, String[] piegenereKey) {
+		String result = "";
+		int pos = 0;
+		while (result.length() < length) {
+			char current = PIE.charAt(pos++);
+			result += piegenereKey[Integer.valueOf(current - '0')];
+		}
+		return result.substring(0, length);
+	}
+
+	public static String viegenere(String input, String key, boolean decrypt) {
+		String result = "";
+		int keypos = 0;
+		for (int i = 0; i < input.length(); i++) {
+			result += (char) (decrypt ? (input.charAt(i) - key.charAt(keypos) + 26) % 26 + 'A'
+					: ((input.charAt(i) - 'A') + key.charAt(keypos) - 'A') % 26 + 'A');
+			keypos++;
+			keypos %= key.length();
+		}
+		return result;
+	}
+}