diff --git a/src/LScreens.c b/src/LScreens.c
index 2c41cf0f7..04a3bf325 100644
--- a/src/LScreens.c
+++ b/src/LScreens.c
@@ -522,7 +522,7 @@ static void DirectConnectScreen_Load(struct DirectConnectScreen* s) {
 	Options_UNSAFE_Get("launcher-dc-port",     &port);
 	
 	String_InitArray(mppass, mppassBuffer);
-	Options_GetSecure("launcher-dc-mppass", &mppass, &user);
+	Options_GetSecure("launcher-dc-mppass", &mppass);
 	String_InitArray(addr, addrBuffer);
 	String_Format2(&addr, "%s:%s", &ip, &port);
 
@@ -568,7 +568,7 @@ static void DirectConnectScreen_StartClient(void* w, int idx) {
 	Options_Set("launcher-dc-username", user);
 	Options_Set("launcher-dc-ip",       &ip);
 	Options_Set("launcher-dc-port",     &port);
-	Options_SetSecure("launcher-dc-mppass", mppass, user);
+	Options_SetSecure("launcher-dc-mppass", mppass);
 
 	DirectConnectScreen_SetStatus("");
 	Launcher_StartGame(user, mppass, &ip, &port, &String_Empty);
@@ -706,7 +706,7 @@ CC_NOINLINE static void MainScreen_GetResume(struct ResumeInfo* info, cc_bool fu
 
 	if (!full) return;
 	String_InitArray(info->mppass, info->_mppassBuffer);
-	Options_GetSecure(ROPT_MPPASS, &info->mppass, &info->user);
+	Options_GetSecure(ROPT_MPPASS, &info->mppass);
 
 	info->valid = 
 		info->user.length && info->mppass.length &&
@@ -740,7 +740,7 @@ static void MainScreen_DoLogin(void) {
 
 	if (GetTokenTask.Base.working) return;
 	Options_Set(LOPT_USERNAME, user);
-	Options_SetSecure(LOPT_PASSWORD, pass, user);
+	Options_SetSecure(LOPT_PASSWORD, pass);
 
 	GetTokenTask_Run();
 	LLabel_SetConst(&s->lblStatus, "&eSigning in..");
@@ -806,7 +806,7 @@ static void MainScreen_Init(struct LScreen* s_) {
 	
 	String_InitArray(pass, passBuffer);
 	Options_UNSAFE_Get(LOPT_USERNAME, &user);
-	Options_GetSecure(LOPT_PASSWORD, &pass, &user);
+	Options_GetSecure(LOPT_PASSWORD, &pass);
 
 	LInput_SetText(&s->iptUsername, &user);
 	LInput_SetText(&s->iptPassword, &pass);
diff --git a/src/LWeb.c b/src/LWeb.c
index de3b1782c..c607bd0c4 100644
--- a/src/LWeb.c
+++ b/src/LWeb.c
@@ -687,7 +687,7 @@ void Session_Load(void) {
 	StringsBuffer_SetLengthBits(&ccCookies, 11);
 
 	String_InitArray(session, buffer);
-	Options_GetSecure(LOPT_SESSION, &session, &Game_Username);
+	Options_GetSecure(LOPT_SESSION, &session);
 	if (!session.length) return;
 	EntryList_Set(&ccCookies, &sessionKey, &session, '=');
 }
@@ -696,7 +696,7 @@ void Session_Save(void) {
 #if defined CC_BUILD_WIN || defined CC_BUILD_LINUX || defined CC_BUILD_MACOS
 	cc_string session = EntryList_UNSAFE_Get(&ccCookies, &sessionKey, '=');
 	if (!session.length) return;
-	Options_SetSecure(LOPT_SESSION, &session, &Game_Username);
+	Options_SetSecure(LOPT_SESSION, &session);
 #endif
 }
 #endif
diff --git a/src/Launcher.c b/src/Launcher.c
index 28da21857..ccbe92e2e 100644
--- a/src/Launcher.c
+++ b/src/Launcher.c
@@ -96,7 +96,7 @@ cc_bool Launcher_StartGame(const cc_string* user, const cc_string* mppass, const
 		Options_Set(ROPT_USER,   user);
 		Options_Set(ROPT_IP,     ip);
 		Options_Set(ROPT_PORT,   port);
-		Options_SetSecure(ROPT_MPPASS, mppass, user);
+		Options_SetSecure(ROPT_MPPASS, mppass);
 	}
 	/* Save options BEFORE starting new game process */
 	/* Otherwise can get 'file already in use' errors on startup */
diff --git a/src/Options.c b/src/Options.c
index 20b011e43..094398409 100644
--- a/src/Options.c
+++ b/src/Options.c
@@ -165,30 +165,34 @@ void Options_SetString(const cc_string* key, const cc_string* value) {
 	StringsBuffer_Add(&changedOpts, key);
 }
 
-void Options_SetSecure(const char* opt, const cc_string* src, const cc_string* key) {
+void Options_SetSecure(const char* opt, const cc_string* src) {
 	char data[2000], encData[1500+1];
 	cc_string tmp, enc;
+	cc_result res;
+	if (!src->length) return;
 
 	String_InitArray(enc, encData);
-	if (!src->length || !key->length) return;
-	if (Platform_Encrypt(key, src->buffer, src->length, &enc)) return;
-	if (enc.length > 1500) Logger_Abort("too large to base64");
+	res = Platform_Encrypt(src->buffer, src->length, &enc);
+	if (res) { Platform_Log2("Error %h encrypting option %c", &res, opt); return; }
 
+	if (enc.length > 1500) Logger_Abort("too large to base64");
 	tmp.buffer   = data;
 	tmp.length   = Convert_ToBase64(enc.buffer, enc.length, data);
 	tmp.capacity = tmp.length;
 	Options_Set(opt, &tmp);
 }
 
-void Options_GetSecure(const char* opt, cc_string* dst, const cc_string* key) {
+void Options_GetSecure(const char* opt, cc_string* dst) {
 	cc_uint8 data[1500];
 	int dataLen;
 	cc_string raw;
+	cc_result res;
 
 	Options_UNSAFE_Get(opt, &raw);
-	if (!raw.length || !key->length) return;
+	if (!raw.length) return;
 	if (raw.length > 2000) Logger_Abort("too large to base64");
 
 	dataLen = Convert_FromBase64(raw.buffer, raw.length, data);
-	Platform_Decrypt(key, data, dataLen, dst);
+	res = Platform_Decrypt(data, dataLen, dst);
+	if (res) Platform_Log2("Error %h decrypting option %c", &res, opt);
 }
diff --git a/src/Options.h b/src/Options.h
index 0b6f19a66..1ef4d2772 100644
--- a/src/Options.h
+++ b/src/Options.h
@@ -124,9 +124,9 @@ CC_API void Options_Set(const char*     keyRaw,  const cc_string* value);
 CC_API void Options_SetString(const cc_string* key, const cc_string* value);
 
 /* Attempts to securely encode an option. */
-/* NOTE: Not all platforms support secure saving. DO NOT RELY ON THIS BEING SECURE! */
-void Options_SetSecure(const char* opt, const cc_string* data, const cc_string* key);
+/* NOTE: Not all platforms support secure saving. */
+void Options_SetSecure(const char* opt, const cc_string* data);
 /* Attempts to securely decode an option. */
-/* NOTE: Not all platforms support secure saving. DO NOT RELY ON THIS BEING SECURE! */
-void Options_GetSecure(const char* opt, cc_string* data, const cc_string* key);
+/* NOTE: Not all platforms support secure saving. */
+void Options_GetSecure(const char* opt, cc_string* data);
 #endif
diff --git a/src/Platform.c b/src/Platform.c
index 7e66c2f75..64114afe2 100644
--- a/src/Platform.c
+++ b/src/Platform.c
@@ -1763,7 +1763,7 @@ void Platform_Init(void) { Platform_InitPosix(); }
 *-------------------------------------------------------Encryption--------------------------------------------------------*
 *#########################################################################################################################*/
 #if defined CC_BUILD_WIN
-cc_result Platform_Encrypt(const cc_string* key, const void* data, int len, cc_string* dst) {
+cc_result Platform_Encrypt(const void* data, int len, cc_string* dst) {
 	DATA_BLOB input, output;
 	int i;
 	input.cbData = len; input.pbData = (BYTE*)data;
@@ -1775,7 +1775,7 @@ cc_result Platform_Encrypt(const cc_string* key, const void* data, int len, cc_s
 	LocalFree(output.pbData);
 	return 0;
 }
-cc_result Platform_Decrypt(const cc_string* key, const void* data, int len, cc_string* dst) {
+cc_result Platform_Decrypt(const void* data, int len, cc_string* dst) {
 	DATA_BLOB input, output;
 	int i;
 	input.cbData = len; input.pbData = (BYTE*)data;
@@ -1787,7 +1787,7 @@ cc_result Platform_Decrypt(const cc_string* key, const void* data, int len, cc_s
 	LocalFree(output.pbData);
 	return 0;
 }
-#elif defined CC_BUILD_LINUX || defined CC_BUILD_MACOS
+#elif defined CC_BUILD_POSIX
 /* Encrypts data using XTEA block cipher, with OS specific method to get machine-specific key */
 
 static void EncipherBlock(cc_uint32* v, const cc_uint32* key, cc_string* dst) {
@@ -1839,31 +1839,29 @@ static void DecodeMachineID(char* tmp, int len, cc_uint32* key) {
 
 #if defined CC_BUILD_LINUX
 /* Read /var/lib/dbus/machine-id for the key */
-static void GetMachineID(cc_uint32* key) {
+static cc_result GetMachineID(cc_uint32* key) {
 	const cc_string idFile = String_FromConst("/var/lib/dbus/machine-id");
 	char tmp[MACHINEID_LEN];
 	struct Stream s;
+	cc_result res;
 	int i;
 
-	for (i = 0; i < 4; i++) key[i] = 0;
-	if (Stream_OpenFile(&s, &idFile)) return;
+	if ((res = Stream_OpenFile(&s, &idFile))) return res;
+	res = Stream_Read(&s, tmp, MACHINEID_LEN);
+	if (!res) DecodeMachineID(tmp, MACHINEID_LEN, key);
 
-	if (!Stream_Read(&s, tmp, MACHINEID_LEN)) {
-		DecodeMachineID(tmp, MACHINEID_LEN, key);
-	}
 	(void)s.Close(&s);
+	return res;
 }
 #elif defined CC_BUILD_MACOS
-static void GetMachineID(cc_uint32* key) {
+/* Read kIOPlatformUUIDKey from I/O registry for the key */
+static cc_result GetMachineID(cc_uint32* key) {
 	io_registry_entry_t registry;
 	CFStringRef uuid = NULL;
-	const char* src;
-	struct Stream s;
-	int i;
+	const char* src  = NULL;
 
-	for (i = 0; i < 4; i++) key[i] = 0;
 	registry = IORegistryEntryFromPath(kIOMasterPortDefault, "IOService:/");
-	if (!registry) return;
+	if (!registry) return ERR_NOT_SUPPORTED;
 
 #ifdef kIOPlatformUUIDKey
 	uuid = IORegistryEntryCreateCFProperty(registry, CFSTR(kIOPlatformUUIDKey), kCFAllocatorDefault, 0);
@@ -1873,16 +1871,20 @@ static void GetMachineID(cc_uint32* key) {
 #endif
 	if (uuid) CFRelease(uuid);
 	IOObjectRelease(registry);
+	return src ? 0 : ERR_NOT_SUPPORTED;
 }
+#else
+static cc_result GetMachineID(cc_uint32* key) { return ERR_NOT_SUPPORTED; }
 #endif
 
-cc_result Platform_Encrypt(const cc_string* key_, const void* data, int len, cc_string* dst) {
+cc_result Platform_Encrypt(const void* data, int len, cc_string* dst) {
 	const cc_uint8* src = (const cc_uint8*)data;
 	cc_uint32 header[4], key[4];
+	cc_result res;
+	if ((res = GetMachineID(key))) return res;
+
 	header[0] = ENC1; header[1] = ENC2;
 	header[2] = ENC3; header[3] = len;
-
-	GetMachineID(key);
 	EncipherBlock(header + 0, key, dst);
 	EncipherBlock(header + 2, key, dst);
 
@@ -1893,14 +1895,16 @@ cc_result Platform_Encrypt(const cc_string* key_, const void* data, int len, cc_
 	}
 	return 0;
 }
-cc_result Platform_Decrypt(const cc_string* key__, const void* data, int len, cc_string* dst) {
+cc_result Platform_Decrypt(const void* data, int len, cc_string* dst) {
 	const cc_uint8* src = (const cc_uint8*)data;
 	cc_uint32 header[4], key[4];
+	cc_result res;
 	int dataLen;
+
 	/* Total size must be >= header size */
 	if (len < 16) return ERR_END_OF_STREAM;
+	if ((res = GetMachineID(key))) return res;
 
-	GetMachineID(key);
 	Mem_Copy(header, src, 16);
 	DecipherBlock(header + 0, key);
 	DecipherBlock(header + 2, key);
@@ -1920,24 +1924,6 @@ cc_result Platform_Decrypt(const cc_string* key__, const void* data, int len, cc
 	}
 	return 0;
 }
-#elif defined CC_BUILD_POSIX
-cc_result Platform_Encrypt(const cc_string* key, const void* data, int len, cc_string* dst) {
-	/* TODO: Is there a similar API for macOS/Linux? */
-	/* Fallback to NOT SECURE XOR. Prevents simple reading from options.txt */
-	const cc_uint8* src = data;
-	cc_uint8 c;
-	int i;
-
-	for (i = 0; i < len; i++) {
-		c = (cc_uint8)(src[i] ^ key->buffer[i % key->length] ^ 0x43);
-		String_Append(dst, c);
-	}
-	return 0;
-}
-cc_result Platform_Decrypt(const cc_string* key, const void* data, int len, cc_string* dst) {
-	/* TODO: Is there a similar API for macOS/Linux? */
-	return Platform_Encrypt(key, data, len, dst);
-}
 #endif
 
 
diff --git a/src/Platform.h b/src/Platform.h
index 1747f3d53..914c1a4be 100644
--- a/src/Platform.h
+++ b/src/Platform.h
@@ -53,11 +53,9 @@ cc_result Platform_SetDefaultCurrentDirectory(int argc, char **argv);
 int Platform_GetCommandLineArgs(int argc, STRING_REF char** argv, cc_string* args);
 
 /* Encrypts data in a platform-specific manner. (may not be supported) */
-/* NOTE: THIS IS NOT SECURE! Some platforms just use a simple xor obfuscation. */
-cc_result Platform_Encrypt(const cc_string* key, const void* data, int len, cc_string* dst);
+cc_result Platform_Encrypt(const void* data, int len, cc_string* dst);
 /* Decrypts data in a platform-specific manner. (may not be supported) */
-/* NOTE: THIS IS NOT SECURE! Some platforms just use a simple xor obfuscation. */
-cc_result Platform_Decrypt(const cc_string* key, const void* data, int len, cc_string* dst);
+cc_result Platform_Decrypt(const void* data, int len, cc_string* dst);
 /* Outputs more detailed information about errors with operating system functions. */
 /* NOTE: This is for general functions like file I/O. If a more specific 
 describe exists (e.g. Http_DescribeError), that should be preferred. */