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+this repository contains 3 mains :
+- crypto.ex use for test ( take a file, crypt and decrypt this file in one step )
+	products a crypted and decrypted file.
+
+- crypt.ex : allow to crypt a file with aes algorithms
+	./crypt.ex <FileToCrypt>
+		products the crypted file and a json file which contain aes key and aes IV key.
+
+- decrypt.ex : allow to uncrypt a file from a crypted file and a json key file.
+	./decrypt.ex <FileToDecrypt> <aesKeyFile>
+		products the uncrypted file.