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Commit2567859

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CaesarBruteForce
1 parent4690efb commit2567859

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packagecom.ciphers;
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publicclassCaesarBruteForce {
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/**
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* Recursively Brute forces a parsed encrypted text, trying out all shifting keys from 1-26, printing out all decryption attempts
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* @param message (String) The encrypted text.
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* @param Key (int) The key used to decrypt the encrypted text and is increment upon a recursive call.
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* @return (String) Concatenated string of all decryption attempts (For unit testing purposes).
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*/
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publicStringdecrypt(Stringmessage,intKey) {
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finalStringLETTERS ="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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if (Key >26){System.out.println();returnnull; }
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StringBuilderplainText =newStringBuilder();
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for (charcharacter :message.toUpperCase().toCharArray()) {
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intindex =LETTERS.indexOf(character);
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if (index != -1) {
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index -=Key;
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//Wrap around index value range[1-26]
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if (index <0) {index +=LETTERS.length(); }
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plainText.append(LETTERS.toCharArray()[index]);
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}else {plainText.append(character); }
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}
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System.out.println(String.format("Current Decryption Key %d : %s",Key,plainText));
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returnplainText.append(decrypt(message,Key+1)).toString();
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}
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}
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packagecom.ciphers;
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importorg.junit.jupiter.api.Assertions;
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importorg.junit.jupiter.api.Test;
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classCaesarBruteForceTest {
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@Test
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voidtestCaesarBruteForce() {
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CaesarBruteForcecipher =newCaesarBruteForce();
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Assertions.assertSame(true,cipher.decrypt("TKFK",1).contains("JAVA"));
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Assertions.assertSame(true,cipher.decrypt("QHCH",1).contains("JAVA"));
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Assertions.assertSame(true,cipher.decrypt("LUHREIU",1).contains("VERBOSE"));
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Assertions.assertSame(true,cipher.decrypt("Mkockb",1).contains("CAESAR"));
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Assertions.assertSame(true,cipher.decrypt("olssv",1).contains("HELLO"));
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Assertions.assertSame(true,cipher.decrypt("Zvksxdohd",1).contains("PLAINTEXT"));
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Assertions.assertSame(true,cipher.decrypt("XGVKRIM",1).contains("ENCRYPT"));
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Assertions.assertSame(true,cipher.decrypt("OZRRVNQC123",1).contains("PASSWORD123"));
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Assertions.assertSame(true,cipher.decrypt("GEQDZMYQ",1).contains("USERNAME"));
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Assertions.assertSame(true,cipher.decrypt("IKHMXVMXW",1).contains("PROTECTED"));
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Assertions.assertSame(true,cipher.decrypt("ZPSRC-DMPACB",1).contains("BRUTE-FORCED"));
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Assertions.assertSame(true,cipher.decrypt("VCTKJ!",1).contains("PWNED!"));
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Assertions.assertSame(true,cipher.decrypt("JKLMNOP",1).contains("ABCDEFG"));
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Assertions.assertSame(true,cipher.decrypt("QFMDHCUFODVWQ",1).contains("CRYPTOGRAPHIC"));
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Assertions.assertSame(true,cipher.decrypt("Dmbncdc",1).contains("ENCODED"));
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}
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}

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