diff --git a/CryptoExchange.Net/Authentication/AuthenticationProvider.cs b/CryptoExchange.Net/Authentication/AuthenticationProvider.cs
index 4dd1431..0dc3cd4 100644
--- a/CryptoExchange.Net/Authentication/AuthenticationProvider.cs
+++ b/CryptoExchange.Net/Authentication/AuthenticationProvider.cs
@@ -1,4 +1,5 @@
 using CryptoExchange.Net.Interfaces;
+using System.Security;
 
 namespace CryptoExchange.Net.Authentication
 {
@@ -6,11 +7,18 @@ namespace CryptoExchange.Net.Authentication
     {
         public ApiCredentials Credentials { get; }
 
+        public SecureString PrivateKey { get; }
+
         protected AuthenticationProvider(ApiCredentials credentials)
         {
             Credentials = credentials;
         }
 
+        protected AuthenticationProvider(SecureString privateKey)
+        {
+            PrivateKey = privateKey;
+        }
+
         public virtual string AddAuthenticationToUriString(string uri, bool signed)
         {
             return uri;    
diff --git a/CryptoExchange.Net/ExchangeOptions.cs b/CryptoExchange.Net/ExchangeOptions.cs
index b2629da..0ce7720 100644
--- a/CryptoExchange.Net/ExchangeOptions.cs
+++ b/CryptoExchange.Net/ExchangeOptions.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Security;
 using CryptoExchange.Net.Authentication;
 using CryptoExchange.Net.Logging;
 using CryptoExchange.Net.RateLimiter;
@@ -17,6 +18,11 @@ namespace CryptoExchange.Net
         /// </summary>
         public ApiCredentials ApiCredentials { get; set; }
 
+        /// <summary>
+        /// The private key instead of api credentials
+        /// </summary>
+        public SecureString PrivateKey { get; set; }
+
         /// <summary>
         /// Proxy to use
         /// </summary>