如何在plist iOS中加密和解密NSdata？

我正在将姓名和3个电话号码保存到plist中。当我点击保存按钮时，我需要加密数据。哪一个是更方便的RNCryptor或NSData + AES。如何使用？

 -(void)saveButton
    {    

        NSArray *paths = NSSearchPathForDirectoriesInDomains
        (NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsPath = [paths objectAtIndex:0]; 
        NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"data.plist"];
        self.personName = theName.text;
        self.phoneNumbers = [[NSMutableArray alloc] initWithCapacity:3]; [phoneNumbers addObject:homePhone.text];
        [phoneNumbers addObject:workPhone.text];
        [phoneNumbers addObject:cellPhone.text];
        NSDictionary *plistDict = [NSDictionary dictionaryWithObjects: [NSArray arrayWithObjects: personName, phoneNumbers, nil] forKeys:[NSArray arrayWithObjects: @"Name", @"Phones", nil]];
        NSString *error = nil;
        NSData *plistData = [NSPropertyListSerialization
                             dataFromPropertyList:plistDict format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
        if(plistData) {
            // write plistData to our Data.plist file
            [plistData writeToFile:plistPath atomically:YES];
        }
        else
        {
            NSLog(@"Error in saveData: %@", error);
        }
    }