diff --git a/native/ios/Comm.xcodeproj/project.pbxproj b/native/ios/Comm.xcodeproj/project.pbxproj
--- a/native/ios/Comm.xcodeproj/project.pbxproj
+++ b/native/ios/Comm.xcodeproj/project.pbxproj
@@ -192,6 +192,7 @@
 		CB30C12327D0ACF700FBE8DE /* NotificationService.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = NotificationService.entitlements; sourceTree = "<group>"; };
 		CB38B4792877179A00171182 /* NonBlockingLock.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = NonBlockingLock.h; path = Comm/TemporaryMessageStorage/NonBlockingLock.h; sourceTree = "<group>"; };
 		CB38B47B287718A200171182 /* NonBlockingLock.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; name = NonBlockingLock.mm; path = Comm/TemporaryMessageStorage/NonBlockingLock.mm; sourceTree = "<group>"; };
+		CB38B47C2877190100171182 /* EncryptedFileUtils.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = EncryptedFileUtils.h; path = Comm/TemporaryMessageStorage/EncryptedFileUtils.h; sourceTree = "<group>"; };
 		CB38F2AE286C6C870010535C /* MessageSpecs.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = MessageSpecs.h; path = PersistentStorageUtilities/MessageOperationsUtilities/MessageSpecs.h; sourceTree = "<group>"; };
 		CB38F2AF286C6C870010535C /* MessageOperationsUtilities.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = MessageOperationsUtilities.cpp; path = PersistentStorageUtilities/MessageOperationsUtilities/MessageOperationsUtilities.cpp; sourceTree = "<group>"; };
 		CB38F2B0286C6C870010535C /* MessageOperationsUtilities.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = MessageOperationsUtilities.h; path = PersistentStorageUtilities/MessageOperationsUtilities/MessageOperationsUtilities.h; sourceTree = "<group>"; };
@@ -522,6 +523,7 @@
 		CB38B4782877177B00171182 /* TemporaryMessageStorage */ = {
 			isa = PBXGroup;
 			children = (
+				CB38B47C2877190100171182 /* EncryptedFileUtils.h */,
 				CB38B47B287718A200171182 /* NonBlockingLock.mm */,
 				CB38B4792877179A00171182 /* NonBlockingLock.h */,
 			);
diff --git a/native/ios/Comm/TemporaryMessageStorage/EncryptedFileUtils.h b/native/ios/Comm/TemporaryMessageStorage/EncryptedFileUtils.h
new file mode 100644
--- /dev/null
+++ b/native/ios/Comm/TemporaryMessageStorage/EncryptedFileUtils.h
@@ -0,0 +1,14 @@
+#import <Foundation/Foundation.h>
+
+NSString *const encryptedDataSeparator = @"\n";
+
+@interface EncryptedFileUtils : NSObject
++ (void)writeData:(NSString *)data
+     toFileAtPath:(NSString *)path
+            error:(NSError **)err;
++ (void)appendData:(NSString *)data
+      toFileAtPath:(NSString *)path
+             error:(NSError **)err;
++ (NSArray<NSString *> *)readFromFileAtPath:(NSString *)path
+                                      error:(NSError **)err;
+@end