diff --git a/src/cipher_analytical_machine/cli.clj b/src/cipher_analytical_machine/cli.clj
index 74e8555..8b51deb 100644
--- a/src/cipher_analytical_machine/cli.clj
+++ b/src/cipher_analytical_machine/cli.clj
@@ -2,7 +2,9 @@
   (:require
    [cipher-analytical-machine.file :as file]
    [cipher-analytical-machine.caesar :as caesar]
+   [cipher-analytical-machine.caesar-analyzers :as caesar-analyzers]
    [cipher-analytical-machine.symbol-factories :as sf]
+   [cipher-analytical-machine.symbol-frequences :as symbol-frequences]
    [clojure.string :as cs]
    [clojure.tools.cli :refer [parse-opts]])
   (:gen-class))
@@ -20,6 +22,7 @@
    ["-d" "--decrypt" "Decrypt the message."]
    ["-s" "--symbols" "The string will be used as a set of symbols for a cipher."
     :default (sf/default-symbol-factory "en")]
+   ["-C" "--cracking" "Cracking the encrypted message."]
    ["-h" "--help"]])
 
 (defn usage [options-summary]
@@ -72,6 +75,11 @@
         (contains? options :decrypt)
         {:options options :arguments arguments :action-type :decrypt})
 
+      (and (map-has-keys? options [:cipher, :cracking])
+           (or (contains? options :message)
+               (contains? options :message-file)))
+      {:options options :arguments arguments :action-type :cracking}
+
       :else
       {:exit-message (usage summary)})))
 
@@ -97,6 +105,9 @@
         symbols (:symbols options)]
     (println
      (cond
+       (= action-type :cracking)
+       (caesar-analyzers/get-plaintext message symbols symbol-frequences/english-letter-frequences)
+
        (= action-type :encrypt)
        (caesar/encrypt-message message key symbols)