diff --git a/include/flags.h b/include/flags.h
index b474231..24eb164 100644
--- a/include/flags.h
+++ b/include/flags.h
@@ -39,7 +39,8 @@ enum WHY2_TEXT_KEY_CHAIN_VERSIONS
 {
     WHY2_v1, //FIRST VERSION. Replaced on May 28th 17:45:26 2022 UTC in commit 0d64f4fa7c37f0b57914db902258e279a71c7f9a.
     WHY2_v2, //SECOND VERSION. Replaced on July 11th 17:12:41 2022 UTC in commit 0f01cde0f1e1a9210f4eef7b949e6d247072d3a6.
-    WHY2_v3 //THIRD VERSION. THE LATEST ONE
+    WHY2_v3, //THIRD VERSION. <i forgor to add the time>
+    WHY2_v4
 };
 
 enum WHY2_OUTPUT_FORMAT
diff --git a/src/core/app/main.c b/src/core/app/main.c
index 3a61398..d0de1c9 100644
--- a/src/core/app/main.c
+++ b/src/core/app/main.c
@@ -23,7 +23,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 int main(void)
 {
     //SET FLAGS
-    why2_set_flags((why2_input_flags) { 1, 1, 0, WHY2_v3, WHY2_OUTPUT_TEXT });
+    why2_set_flags((why2_input_flags) { 1, 1, 0, WHY2_v4, WHY2_OUTPUT_TEXT });
 
     //RUN ENCRYPTION WITH WHY2_TEXT_TO_ENCRYPT, GENERATE NEW KEY AND DO NOT CHECK FOR ACTIVE WHY2_VERSION & PREVENT ANY OUTPUT
     why2_output_flags encryptedText = why2_encrypt_text(WHY2_TEXT_TO_ENCRYPT, NULL);
diff --git a/src/core/lib/flags.c b/src/core/lib/flags.c
index 0e93c9c..beb7a1c 100644
--- a/src/core/lib/flags.c
+++ b/src/core/lib/flags.c
@@ -25,7 +25,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <why2/memory.h>
 
 //CONSTS (this is just local)
-#define DEFAULT_FLAGS (why2_input_flags) { 0, 0, 0, WHY2_v3, WHY2_OUTPUT_TEXT }
+#define DEFAULT_FLAGS (why2_input_flags) { 0, 0, 0, WHY2_v4, WHY2_OUTPUT_TEXT }
 #define DEFAULT_MEMORY_IDENTIFIER ""
 
 int encryptionOperation(int text, int encryptedText);
diff --git a/src/core/lib/test/main.c b/src/core/lib/test/main.c
index 5ef72f8..a74eb39 100644
--- a/src/core/lib/test/main.c
+++ b/src/core/lib/test/main.c
@@ -44,7 +44,7 @@ int main(void)
         0, //SKIP CHECK
         0, //NO OUTPUT
         0, //UPDATE
-        WHY2_v3, //LATEST VERSION
+        WHY2_v4, //LATEST VERSION
         WHY2_OUTPUT_TEXT //READABLE TEXT OUTPUT
     };
 
diff --git a/src/core/lib/utils/misc.c b/src/core/lib/utils/misc.c
index 51ddd21..ba085a6 100644
--- a/src/core/lib/utils/misc.c
+++ b/src/core/lib/utils/misc.c
@@ -34,6 +34,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <why2/flags.h>
 #include <why2/memory.h>
 
+int mod_cb(int a, int b) { return a % b; }
 int multiply_cb(int a, int b) { return a * b; }
 int subtract_cb(int a, int b) { return a - b; }
 int sum_cb(int a, int b) { return a + b; }
@@ -302,18 +303,24 @@ void why2_generate_text_key_chain(char *key, int *text_key_chain, int text_key_c
                 number_buffer_2 = text_key_chain_size - (i + 1);
                 number_buffer_3 = why2_get_key_length() - (number_buffer + (i < text_key_chain_size));
                 break;
+
+            case WHY2_v4:
+                number_buffer_2 = text_key_chain_size - (i + 1);
+                number_buffer_3 = (why2_get_key_length() ^ text_key_chain_size) >> (number_buffer & (i < text_key_chain_size)); //gl fucker
+                break;
         }
 
         //FILL textKeyChain
-        if ((number_buffer + 1) % 3 == 0)
+        if (why2_get_flags().version == WHY2_v4 && (number_buffer + 1) % 4 == 0)
+        {
+            cb = mod_cb;
+        } else if ((number_buffer + 1) % 3 == 0)
         {
             cb = multiply_cb;
-        }
-        else if ((number_buffer + 1) % 2 == 0)
+        } else if ((number_buffer + 1) % 2 == 0)
         {
             cb = subtract_cb;
-        }
-        else
+        } else
         {
             cb = sum_cb;
         }
diff --git a/src/logger/app/main.c b/src/logger/app/main.c
index a5abcd9..d0247e2 100644
--- a/src/logger/app/main.c
+++ b/src/logger/app/main.c
@@ -16,7 +16,7 @@ int main(void)
             1,
             1,
             0,
-            WHY2_v3,
+            WHY2_v4,
             WHY2_OUTPUT_TEXT
         }
     );
diff --git a/src/logger/lib/logger.c b/src/logger/lib/logger.c
index eb230bb..ece85d7 100644
--- a/src/logger/lib/logger.c
+++ b/src/logger/lib/logger.c
@@ -132,7 +132,7 @@ void why2_write_log(int loggerFile, char *logMessage)
     why2_log_flags flags = why2_get_log_flags();
 
     //SET ENCRYPTER FLAGS
-    if (!why2_get_flags_changed()) why2_set_flags((why2_input_flags) { 0, 1, 0, WHY2_v3, WHY2_OUTPUT_TEXT });
+    if (!why2_get_flags_changed()) why2_set_flags((why2_input_flags) { 0, 1, 0, WHY2_v4, WHY2_OUTPUT_TEXT });
 
     if (flags.key != NULL) //ENCRYPT TEXT IF KEY WAS CHANGED
     {