diff --git a/app/src/main/java/com/mylloon/mobidl/Credentials.kt b/app/src/main/java/com/mylloon/mobidl/Credentials.kt
index 692dbde..ab2abca 100644
--- a/app/src/main/java/com/mylloon/mobidl/Credentials.kt
+++ b/app/src/main/java/com/mylloon/mobidl/Credentials.kt
@@ -104,6 +104,36 @@ class Credentials {
         } else null
     }
 
+    fun storeSID(sid: String) {
+        val sidEncrypted = encrypt(sid) // encrypt sid
+        val context = MainActivity.applicationContext() // get app context
+
+        // write encrypted data to the app preference
+        val sharedPref = context.getSharedPreferences(sharedPref, MODE_PRIVATE)
+        with(sharedPref?.edit()) {
+            this?.putString("sid", sidEncrypted.contentToString())
+            this?.apply()
+        }
+    }
+
+    fun getSID(): String? {
+        val context = MainActivity.applicationContext() // get app context
+
+        // read encrypted data from the app preference
+        val sharedPref = context.getSharedPreferences(sharedPref, MODE_PRIVATE)
+        val data: String? = sharedPref.getString("sid", null)
+
+        return if (data != null) {
+            val split: List<String> =
+                data.substring(1, data.length - 1).split(", ")
+            val array = ByteArray(split.size)
+            for (i in split.indices) {
+                array[i] = split[i].toByte()
+            }
+            decrypt(array)
+        } else null
+    }
+
     fun delete() {
         val context = MainActivity.applicationContext() // get app context
 
@@ -112,6 +142,7 @@ class Credentials {
         with(sharedPref.edit()) {
             this.remove("username")
             this.remove("password")
+            this.remove("sid")
             this.apply()
         }
     }