diff --git a/DIRECTORY.md b/DIRECTORY.md
index b769250e..fd50b291 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -48,7 +48,6 @@
             * [ProductCipher](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/ProductCipher.java)
             * [RSA](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/RSA.java)
             * [SimpleSubCipher](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/SimpleSubCipher.java)
-            * [SimpleSubstitutionCipher](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/SimpleSubstitutionCipher.java)
             * [Vigenere](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/Vigenere.java)
           * conversions
             * [AnyBaseToAnyBase](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/conversions/AnyBaseToAnyBase.java)
@@ -596,7 +595,6 @@
             * [PolybiusTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/PolybiusTest.java)
             * [RSATest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/RSATest.java)
             * [SimpleSubCipherTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/SimpleSubCipherTest.java)
-            * [SimpleSubstitutionCipherTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/SimpleSubstitutionCipherTest.java)
             * [VigenereTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/VigenereTest.java)
           * conversions
             * [BinaryToDecimalTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/conversions/BinaryToDecimalTest.java)
diff --git a/src/main/java/com/thealgorithms/ciphers/SimpleSubstitutionCipher.java b/src/main/java/com/thealgorithms/ciphers/SimpleSubstitutionCipher.java
deleted file mode 100644
index 6ce3c564..00000000
--- a/src/main/java/com/thealgorithms/ciphers/SimpleSubstitutionCipher.java
+++ /dev/null
@@ -1,83 +0,0 @@
-package com.thealgorithms.ciphers;
-
-import java.util.HashMap;
-import java.util.Map;
-
-/**
- * The simple substitution cipher is a cipher that has been in use for many
- * hundreds of years (an excellent history is given in Simon Singhs 'the Code
- * Book'). It basically consists of substituting every plaintext character for a
- * different ciphertext character. It differs from the Caesar cipher in that the
- * cipher alphabet is not simply the alphabet shifted, it is completely jumbled.
- *
- * @author Hassan Elseoudy
- */
-public class SimpleSubstitutionCipher {
-
-    /**
-     * Encrypt text by replacing each element with its opposite character.
-     *
-     * @return Encrypted message
-     */
-    public static String encode(String message, String cipherSmall) {
-        StringBuilder encoded = new StringBuilder();
-
-        // This map is used to encode
-        Map<Character, Character> cipherMap = new HashMap<>();
-
-        char beginSmallLetter = 'a';
-        char beginCapitalLetter = 'A';
-
-        cipherSmall = cipherSmall.toLowerCase();
-        String cipherCapital = cipherSmall.toUpperCase();
-
-        // To handle Small and Capital letters
-        for (int i = 0; i < cipherSmall.length(); i++) {
-            cipherMap.put(beginSmallLetter++, cipherSmall.charAt(i));
-            cipherMap.put(beginCapitalLetter++, cipherCapital.charAt(i));
-        }
-
-        for (int i = 0; i < message.length(); i++) {
-            if (Character.isAlphabetic(message.charAt(i))) {
-                encoded.append(cipherMap.get(message.charAt(i)));
-            } else {
-                encoded.append(message.charAt(i));
-            }
-        }
-
-        return encoded.toString();
-    }
-
-    /**
-     * Decrypt message by replacing each element with its opposite character in
-     * cipher.
-     *
-     * @return message
-     */
-    public static String decode(String encryptedMessage, String cipherSmall) {
-        StringBuilder decoded = new StringBuilder();
-
-        Map<Character, Character> cipherMap = new HashMap<>();
-
-        char beginSmallLetter = 'a';
-        char beginCapitalLetter = 'A';
-
-        cipherSmall = cipherSmall.toLowerCase();
-        String cipherCapital = cipherSmall.toUpperCase();
-
-        for (int i = 0; i < cipherSmall.length(); i++) {
-            cipherMap.put(cipherSmall.charAt(i), beginSmallLetter++);
-            cipherMap.put(cipherCapital.charAt(i), beginCapitalLetter++);
-        }
-
-        for (int i = 0; i < encryptedMessage.length(); i++) {
-            if (Character.isAlphabetic(encryptedMessage.charAt(i))) {
-                decoded.append(cipherMap.get(encryptedMessage.charAt(i)));
-            } else {
-                decoded.append(encryptedMessage.charAt(i));
-            }
-        }
-
-        return decoded.toString();
-    }
-}
diff --git a/src/test/java/com/thealgorithms/ciphers/SimpleSubstitutionCipherTest.java b/src/test/java/com/thealgorithms/ciphers/SimpleSubstitutionCipherTest.java
deleted file mode 100644
index f7cace2e..00000000
--- a/src/test/java/com/thealgorithms/ciphers/SimpleSubstitutionCipherTest.java
+++ /dev/null
@@ -1,48 +0,0 @@
-package com.thealgorithms.ciphers;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
-import org.junit.jupiter.api.Test;
-
-public class SimpleSubstitutionCipherTest {
-
-    @Test
-    void testEncode() {
-        // Given
-        String message = "HELLOWORLD";
-        String key = "phqgiumeaylnofdxjkrcvstzwb";
-
-        // When
-        String actual = SimpleSubstitutionCipher.encode(message, key);
-
-        // Then
-        assertEquals("EINNDTDKNG", actual);
-    }
-
-    @Test
-    void testDecode() {
-        // Given
-        String message = "EINNDTDKNG";
-        String key = "phqgiumeaylnofdxjkrcvstzwb";
-
-        // When
-        String actual = SimpleSubstitutionCipher.decode(message, key);
-
-        // Then
-        assertEquals("HELLOWORLD", actual);
-    }
-
-    @Test
-    void testIsTextTheSameAfterEncodeAndDecode() {
-        // Given
-        String text = "HELLOWORLD";
-        String key = "phqgiumeaylnofdxjkrcvstzwb";
-
-        // When
-        String encodedText = SimpleSubstitutionCipher.encode(text, key);
-        String decodedText = SimpleSubstitutionCipher.decode(encodedText, key);
-
-        // Then
-        assertEquals(text, decodedText);
-    }
-}