diff --git a/SSZipArchive/SSZipArchive.h b/SSZipArchive/SSZipArchive.h
index 69122e4..4bba494 100644
--- a/SSZipArchive/SSZipArchive.h
+++ b/SSZipArchive/SSZipArchive.h
@@ -35,16 +35,16 @@
 		progressHandler:(void (^)(NSString *entry, unz_file_info zipInfo, long entryNumber, long total))progressHandler
 	  completionHandler:(void (^)(NSString *path, BOOL succeeded, NSError *error))completionHandler;
 
-// Zip
-+ (BOOL)createZipFileAtPath:(NSString *)path withFilesAtPaths:(NSArray *)filenames;
-+ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath;
-+ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath keepParentDirectory:(BOOL)keepParentDirectory;
+// Zip, password could be nil
++ (BOOL)createZipFileAtPath:(NSString *)path withFilesAtPaths:(NSArray *)paths withPassword:(NSString *)password;
++ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath  withPassword:(NSString *)password;
++ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath keepParentDirectory:(BOOL)keepParentDirectory withPassword:(NSString *)password;
 
 - (instancetype)initWithPath:(NSString *)path;
 @property (NS_NONATOMIC_IOSONLY, readonly) BOOL open;
-- (BOOL)writeFile:(NSString *)path;
-- (BOOL)writeFileAtPath:(NSString *)path withFileName:(NSString *)fileName;
-- (BOOL)writeData:(NSData *)data filename:(NSString *)filename;
+- (BOOL)writeFile:(NSString *)path withPassword:(NSString *)password;
+- (BOOL)writeFileAtPath:(NSString *)path withFileName:(NSString *)fileName withPassword:(NSString *)password;
+- (BOOL)writeData:(NSData *)data filename:(NSString *)filename withPassword:(NSString *)password;
 @property (NS_NONATOMIC_IOSONLY, readonly) BOOL close;
 
 @end
diff --git a/SSZipArchive/SSZipArchive.m b/SSZipArchive/SSZipArchive.m
index f3eea1d..296461f 100644
--- a/SSZipArchive/SSZipArchive.m
+++ b/SSZipArchive/SSZipArchive.m
@@ -375,13 +375,13 @@
 
 #pragma mark - Zipping
 
-+ (BOOL)createZipFileAtPath:(NSString *)path withFilesAtPaths:(NSArray *)paths
++ (BOOL)createZipFileAtPath:(NSString *)path withFilesAtPaths:(NSArray *)paths withPassword:(NSString *)password
 {
 	BOOL success = NO;
 	SSZipArchive *zipArchive = [[SSZipArchive alloc] initWithPath:path];
 	if ([zipArchive open]) {
 		for (NSString *filePath in paths) {
-			[zipArchive writeFile:filePath];
+			[zipArchive writeFile:filePath withPassword:password];
 		}
 		success = [zipArchive close];
 	}
@@ -393,12 +393,12 @@
 	return success;
 }
 
-+ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath {
-    return [self createZipFileAtPath:path withContentsOfDirectory:directoryPath keepParentDirectory:NO];
++ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath  withPassword:(NSString *)password{
+return [self createZipFileAtPath:path withContentsOfDirectory:directoryPath keepParentDirectory:NO withPassword:password];
 }
 
 
-+ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath keepParentDirectory:(BOOL)keepParentDirectory {
++ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath keepParentDirectory:(BOOL)keepParentDirectory withPassword:(NSString *)password{
     BOOL success = NO;
     
     NSFileManager *fileManager = nil;
@@ -418,7 +418,7 @@
                 {
                     fileName = [[directoryPath lastPathComponent] stringByAppendingPathComponent:fileName];
                 }
-                [zipArchive writeFileAtPath:fullFilePath withFileName:fileName];
+                [zipArchive writeFileAtPath:fullFilePath withFileName:fileName withPassword:password];
             }
             else
             {
@@ -426,7 +426,7 @@
                 {
                     NSString *tempName = [fullFilePath stringByAppendingPathComponent:@".DS_Store"];
                     [@"" writeToFile:tempName atomically:YES encoding:NSUTF8StringEncoding error:nil];
-                    [zipArchive writeFileAtPath:tempName withFileName:[fileName stringByAppendingPathComponent:@".DS_Store"]];
+                    [zipArchive writeFileAtPath:tempName withFileName:[fileName stringByAppendingPathComponent:@".DS_Store"] withPassword:password];
                     [[NSFileManager defaultManager] removeItemAtPath:tempName error:nil];
                 }
             }
@@ -486,7 +486,7 @@
     zipInfo->tmz_date.tm_year = (unsigned int)components.year;
 }
 
-- (BOOL)writeFolderAtPath:(NSString *)path withFolderName:(NSString *)folderName
+- (BOOL)writeFolderAtPath:(NSString *)path withFolderName:(NSString *)folderName withPassword:(NSString *)password
 {
     NSAssert((_zip != NULL), @"Attempting to write to an archive which was never opened");
 
@@ -520,21 +520,22 @@
     }
 
 	unsigned int len = 0;
-    zipOpenNewFileInZip(_zip, [[folderName stringByAppendingString:@"/"] UTF8String], &zipInfo, NULL, 0, NULL, 0, NULL, Z_DEFLATED, Z_NO_COMPRESSION);
+    zipOpenNewFileInZip3(_zip, [[folderName stringByAppendingString:@"/"] UTF8String], &zipInfo, NULL, 0, NULL, 0, NULL, Z_DEFLATED, Z_NO_COMPRESSION, 0, -MAX_WBITS, DEF_MEM_LEVEL,
+                         Z_DEFAULT_STRATEGY, [password UTF8String], 0);
 	zipWriteInFileInZip(_zip, &len, 0);
 	zipCloseFileInZip(_zip);
 	return YES;
 }
 
-- (BOOL)writeFile:(NSString *)path
+- (BOOL)writeFile:(NSString *)path withPassword:(NSString *)password;
 {
-    return [self writeFileAtPath:path withFileName:nil];
+    return [self writeFileAtPath:path withFileName:nil withPassword:password];
 }
 
 // supports writing files with logical folder/directory structure
 // *path* is the absolute path of the file that will be compressed
 // *fileName* is the relative name of the file how it is stored within the zip e.g. /folder/subfolder/text1.txt
-- (BOOL)writeFileAtPath:(NSString *)path withFileName:(NSString *)fileName
+- (BOOL)writeFileAtPath:(NSString *)path withFileName:(NSString *)fileName withPassword:(NSString *)password
 {
     NSAssert((_zip != NULL), @"Attempting to write to an archive which was never opened");
 
@@ -580,8 +581,8 @@
         }
     }
 
-    zipOpenNewFileInZip(_zip, afileName, &zipInfo, NULL, 0, NULL, 0, NULL, Z_DEFLATED, Z_DEFAULT_COMPRESSION);
-
+    zipOpenNewFileInZip3(_zip, afileName, &zipInfo, NULL, 0, NULL, 0, NULL, Z_DEFLATED, Z_DEFAULT_COMPRESSION, 0, -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY, [password UTF8String], 0);
+    
 	void *buffer = malloc(CHUNK);
 	unsigned int len = 0;
 
@@ -597,7 +598,7 @@
 	return YES;
 }
 
-- (BOOL)writeData:(NSData *)data filename:(NSString *)filename
+- (BOOL)writeData:(NSData *)data filename:(NSString *)filename withPassword:(NSString *)password;
 {
     if (!_zip) {
 		return NO;
@@ -608,7 +609,7 @@
     zip_fileinfo zipInfo = {{0,0,0,0,0,0},0,0,0};
     [self zipInfo:&zipInfo setDate:[NSDate date]];
 
-	zipOpenNewFileInZip(_zip, [filename UTF8String], &zipInfo, NULL, 0, NULL, 0, NULL, Z_DEFLATED, Z_DEFAULT_COMPRESSION);
+    zipOpenNewFileInZip3(_zip, [filename UTF8String], &zipInfo, NULL, 0, NULL, 0, NULL, Z_DEFLATED, Z_DEFAULT_COMPRESSION, 0, -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY, [password UTF8String], 0);
 
     zipWriteInFileInZip(_zip, data.bytes, (unsigned int)data.length);