diff --git a/Emby.Server.Implementations/Cryptography/CryptographyProvider.cs b/Emby.Server.Implementations/Cryptography/CryptographyProvider.cs
index dc528c280..2f2fd9592 100644
--- a/Emby.Server.Implementations/Cryptography/CryptographyProvider.cs
+++ b/Emby.Server.Implementations/Cryptography/CryptographyProvider.cs
@@ -73,8 +73,9 @@ namespace Emby.Server.Implementations.Cryptography
         }
 
         private byte[] PBKDF2(string method, byte[] bytes, byte[] salt, int iterations)
-        {
-            using (var r = new Rfc2898DeriveBytes(bytes, salt, iterations, new HashAlgorithmName(method)))
+        {
+            //downgrading for now as we need this library to be dotnetstandard compliant
+            using (var r = new Rfc2898DeriveBytes(bytes, salt, iterations))
             {
                 return r.GetBytes(32);
             }
diff --git a/Emby.Server.Implementations/Data/SqliteUserRepository.cs b/Emby.Server.Implementations/Data/SqliteUserRepository.cs
index 1b6deae7d..3df91f71c 100644
--- a/Emby.Server.Implementations/Data/SqliteUserRepository.cs
+++ b/Emby.Server.Implementations/Data/SqliteUserRepository.cs
@@ -54,7 +54,8 @@ namespace Emby.Server.Implementations.Data
                 if (!localUsersTableExists && TableExists(connection, "Users"))
                 {
                     TryMigrateToLocalUsersTable(connection);
-                }
+                }
+
                 RemoveEmptyPasswordHashes();
             }
         }
diff --git a/Emby.Server.Implementations/Emby.Server.Implementations.csproj b/Emby.Server.Implementations/Emby.Server.Implementations.csproj
index 86b2efe54..8356a9501 100644
--- a/Emby.Server.Implementations/Emby.Server.Implementations.csproj
+++ b/Emby.Server.Implementations/Emby.Server.Implementations.csproj
@@ -34,7 +34,7 @@
   </ItemGroup>
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netstandard2.0</TargetFramework>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>
 
diff --git a/Emby.Server.Implementations/Library/DefaultAuthenticationProvider.cs b/Emby.Server.Implementations/Library/DefaultAuthenticationProvider.cs
index 80026d97c..2ac3ef424 100644
--- a/Emby.Server.Implementations/Library/DefaultAuthenticationProvider.cs
+++ b/Emby.Server.Implementations/Library/DefaultAuthenticationProvider.cs
@@ -56,7 +56,7 @@ namespace Emby.Server.Implementations.Library
             string CalculatedHashString;
             if (_cryptographyProvider.GetSupportedHashMethods().Contains(readyHash.Id))
             {
-                if (String.IsNullOrEmpty(readyHash.Salt))
+                if (string.IsNullOrEmpty(readyHash.Salt))
                 {
                     CalculatedHash = _cryptographyProvider.ComputeHash(readyHash.Id, passwordbytes);
                     CalculatedHashString = BitConverter.ToString(CalculatedHash).Replace("-", string.Empty);
@@ -65,7 +65,8 @@ namespace Emby.Server.Implementations.Library
                 {
                     CalculatedHash = _cryptographyProvider.ComputeHash(readyHash.Id, passwordbytes, readyHash.SaltBytes);
                     CalculatedHashString = BitConverter.ToString(CalculatedHash).Replace("-", string.Empty);
-                }
+                }
+
                 if (CalculatedHashString == readyHash.Hash)
                 {
                     success = true;
@@ -95,18 +96,20 @@ namespace Emby.Server.Implementations.Library
         private void ConvertPasswordFormat(User user)
         {
             if (!string.IsNullOrEmpty(user.Password))
+            {
+                return;
+            }
+
+            if (!user.Password.Contains("$"))
             {
-                if (!user.Password.Contains("$"))
-                {
-                    string hash = user.Password;
-                    user.Password = String.Format("$SHA1${0}", hash);
-                }
-                
-                if (user.EasyPassword != null && !user.EasyPassword.Contains("$"))
-                {
-                    string hash = user.EasyPassword;
-                    user.EasyPassword = string.Format("$SHA1${0}", hash);
-                }
+                string hash = user.Password;
+                user.Password = String.Format("$SHA1${0}", hash);
+            }
+            
+            if (user.EasyPassword != null && !user.EasyPassword.Contains("$"))
+            {
+                string hash = user.EasyPassword;
+                user.EasyPassword = string.Format("$SHA1${0}", hash);
             }
         }
 
@@ -122,6 +125,7 @@ namespace Emby.Server.Implementations.Library
             {
                 return string.IsNullOrEmpty(password);
             }
+
             return false;
         }
 
@@ -188,7 +192,8 @@ namespace Emby.Server.Implementations.Library
             {
                 ConvertPasswordFormat(user);
                 passwordHash = new PasswordHash(user.Password);
-            }
+            }
+
             if (passwordHash.SaltBytes != null)
             {
                 //the password is modern format with PBKDF and we should take advantage of that
diff --git a/Emby.Server.Implementations/Library/UserManager.cs b/Emby.Server.Implementations/Library/UserManager.cs
index 3daed0c08..b74006233 100644
--- a/Emby.Server.Implementations/Library/UserManager.cs
+++ b/Emby.Server.Implementations/Library/UserManager.cs
@@ -221,9 +221,8 @@ namespace Emby.Server.Implementations.Library
         {
             //This is some regex that matches only on unicode "word" characters, as well as -, _ and @
             //In theory this will cut out most if not all 'control' characters which should help minimize any weirdness
-            string UserNameRegex = "^[\\w-'._@]*$";
             // Usernames can contain letters (a-z + whatever else unicode is cool with), numbers (0-9), dashes (-), underscores (_), apostrophes ('), and periods (.)
-            return Regex.IsMatch(username, UserNameRegex);
+            return Regex.IsMatch(username, "^[\\w-'._@]*$");
         }
 
         private static bool IsValidUsernameCharacter(char i)
diff --git a/MediaBrowser.Model/Cryptography/PasswordHash.cs b/MediaBrowser.Model/Cryptography/PasswordHash.cs
index 3a817543b..49bd510e9 100644
--- a/MediaBrowser.Model/Cryptography/PasswordHash.cs
+++ b/MediaBrowser.Model/Cryptography/PasswordHash.cs
@@ -10,26 +10,33 @@ namespace MediaBrowser.Model.Cryptography
         //https://github.com/P-H-C/phc-string-format/blob/master/phc-sf-spec.md
         //$<id>[$<param>=<value>(,<param>=<value>)*][$<salt>[$<hash>]]
 
-        public string Id;
-        public Dictionary<string, string> Parameters = new Dictionary<string, string>();
-        public string Salt;
-        public byte[] SaltBytes;
-        public string Hash;
-        public byte[] HashBytes;
+        private string id;
+        private Dictionary<string, string> parameters = new Dictionary<string, string>();
+        private string salt;
+        private byte[] saltBytes;
+        private string hash;
+        private byte[] hashBytes;
+        public string Id { get => id; set => id = value; }
+        public Dictionary<string, string> Parameters { get => parameters; set => parameters = value; }
+        public string Salt { get => salt; set => salt = value; }
+        public byte[] SaltBytes { get => saltBytes; set => saltBytes = value; }
+        public string Hash { get => hash; set => hash = value; }
+        public byte[] HashBytes { get => hashBytes; set => hashBytes = value; }
+
         public PasswordHash(string storageString)
         {
             string[] splitted = storageString.Split('$');
-            Id = splitted[1];
+            id = splitted[1];
             if (splitted[2].Contains("="))
             {
                 foreach (string paramset in (splitted[2].Split(',')))
                 {
-                    if (!String.IsNullOrEmpty(paramset))
+                    if (!string.IsNullOrEmpty(paramset))
                     {
                         string[] fields = paramset.Split('=');
                         if (fields.Length == 2)
                         {
-                            Parameters.Add(fields[0], fields[1]);
+                            parameters.Add(fields[0], fields[1]);
                         }
                         else
                         {
@@ -39,32 +46,32 @@ namespace MediaBrowser.Model.Cryptography
                 }
                 if (splitted.Length == 5)
                 {
-                    Salt = splitted[3];
-                    SaltBytes = ConvertFromByteString(Salt);
-                    Hash = splitted[4];
-                    HashBytes = ConvertFromByteString(Hash);
+                    salt = splitted[3];
+                    saltBytes = ConvertFromByteString(salt);
+                    hash = splitted[4];
+                    hashBytes = ConvertFromByteString(hash);
                 }
                 else
                 {
-                    Salt = string.Empty;
-                    Hash = splitted[3];
-                    HashBytes = ConvertFromByteString(Hash);
+                    salt = string.Empty;
+                    hash = splitted[3];
+                    hashBytes = ConvertFromByteString(hash);
                 }
             }
             else
             {
                 if (splitted.Length == 4)
                 {
-                    Salt = splitted[2];
-                    SaltBytes = ConvertFromByteString(Salt);
-                    Hash = splitted[3];
-                    HashBytes = ConvertFromByteString(Hash);
+                    salt = splitted[2];
+                    saltBytes = ConvertFromByteString(salt);
+                    hash = splitted[3];
+                    hashBytes = ConvertFromByteString(hash);
                 }
                 else
                 {
-                    Salt = string.Empty;
-                    Hash = splitted[2];
-                    HashBytes = ConvertFromByteString(Hash);
+                    salt = string.Empty;
+                    hash = splitted[2];
+                    hashBytes = ConvertFromByteString(hash);
                 }
 
             }
@@ -73,9 +80,9 @@ namespace MediaBrowser.Model.Cryptography
 
         public PasswordHash(ICryptoProvider cryptoProvider)
         {
-            Id = cryptoProvider.DefaultHashMethod;
-            SaltBytes = cryptoProvider.GenerateSalt();
-            Salt = ConvertToByteString(SaltBytes);
+            id = cryptoProvider.DefaultHashMethod;
+            saltBytes = cryptoProvider.GenerateSalt();
+            salt = ConvertToByteString(SaltBytes);
         }
 
         public static byte[] ConvertFromByteString(string byteString)
@@ -95,31 +102,35 @@ namespace MediaBrowser.Model.Cryptography
 
         private string SerializeParameters()
         {
-            string ReturnString = String.Empty;
-            foreach (var KVP in Parameters)
+            string ReturnString = string.Empty;
+            foreach (var KVP in parameters)
             {
-                ReturnString += String.Format(",{0}={1}", KVP.Key, KVP.Value);
-            }
+                ReturnString += $",{KVP.Key}={KVP.Value}";
+            }
+
             if ((!string.IsNullOrEmpty(ReturnString)) && ReturnString[0] == ',')
             {
                 ReturnString = ReturnString.Remove(0, 1);
-            }
+            }
+
             return ReturnString;
         }
 
         public override string ToString()
         {
-            string outString = "$" +Id;
+            string outString = "$" +id;
             string paramstring = SerializeParameters();
             if (!string.IsNullOrEmpty(paramstring))
             {
                 outString += $"${paramstring}";
             }
-            if (!string.IsNullOrEmpty(Salt))
+
+            if (!string.IsNullOrEmpty(salt))
             {
-                outString += $"${Salt}";
+                outString += $"${salt}";
             }
-            outString += $"${Hash}";
+
+            outString += $"${hash}";
             return outString;
         }
     }