diff --git a/CocoaSecurity.xcodeproj/project.pbxproj b/CocoaSecurity.xcodeproj/project.pbxproj
index 36f62d2..cd14f53 100644
--- a/CocoaSecurity.xcodeproj/project.pbxproj
+++ b/CocoaSecurity.xcodeproj/project.pbxproj
@@ -337,6 +337,7 @@
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				ARCHS = "$(ARCHS_STANDARD_32_BIT)";
+				CLANG_ENABLE_OBJC_ARC = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
@@ -362,6 +363,7 @@
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				ARCHS = "$(ARCHS_STANDARD_32_BIT)";
+				CLANG_ENABLE_OBJC_ARC = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
diff --git a/CocoaSecurity.xcodeproj/project.xcworkspace/xcuserdata/Kelp.xcuserdatad/UserInterfaceState.xcuserstate b/CocoaSecurity.xcodeproj/project.xcworkspace/xcuserdata/Kelp.xcuserdatad/UserInterfaceState.xcuserstate
index 9d1809a..29f18ef 100644
Binary files a/CocoaSecurity.xcodeproj/project.xcworkspace/xcuserdata/Kelp.xcuserdatad/UserInterfaceState.xcuserstate and b/CocoaSecurity.xcodeproj/project.xcworkspace/xcuserdata/Kelp.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/CocoaSecurity/CocoaSecurity.h b/CocoaSecurity/CocoaSecurity.h
index 2aec8e5..1ffe07e 100644
--- a/CocoaSecurity/CocoaSecurity.h
+++ b/CocoaSecurity/CocoaSecurity.h
@@ -1,9 +1,16 @@
-//
-//  CocoaSecurity.h
-//
-//  Created by Kelp on 12/5/12.
-//  Copyright (c) 2012 Kelp http://kelp.phate.org/
-//
+/*
+ CocoaSecurity  1.0.1
+
+ Created by Kelp on 12/5/12.
+ Copyright (c) 2012 Kelp http://kelp.phate.org/
+ MIT License
+ 
+ CocoaSecurity is core. It provides AES encrypt, AES decrypt, Hash(MD5, HmacMD5, SHA1~SHA512, HmacSHA1~HmacSHA512) messages.
+ 
+ 1.0.1  2012-05-15
+    update ARC version
+ 
+*/
 
 #import <Foundation/Foundation.h>
 #import <Foundation/NSException.h>
diff --git a/CocoaSecurity/CocoaSecurity.m b/CocoaSecurity/CocoaSecurity.m
index b0475e6..888f5d7 100644
--- a/CocoaSecurity/CocoaSecurity.m
+++ b/CocoaSecurity/CocoaSecurity.m
@@ -3,6 +3,7 @@
 //
 //  Created by Kelp on 12/5/12.
 //  Copyright (c) 2012 Kelp http://kelp.phate.org/
+//  MIT License
 //
 
 #import "CocoaSecurity.h"
@@ -26,7 +27,9 @@
     CocoaSecurityDecoder *decoder = [[CocoaSecurityDecoder alloc] init];
     NSData *aesKey = [decoder hex:key];
     NSData *aesIv = [decoder hex:iv];
+#if !__has_feature(objc_arc)
     [decoder release];
+#endif
     
     return [self aesEncrypt:data key:aesKey iv:aesIv];
 }
@@ -64,9 +67,13 @@
                                           [data length],
                                           buffer,
                                           bufferSize,
-										  &encryptedSize);
+                                          &encryptedSize);
 	if (cryptStatus == kCCSuccess) {
+#if __has_feature(objc_arc)
+        CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:buffer length:encryptedSize];
+#else
         CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:buffer length:encryptedSize] autorelease];
+#endif
 		free(buffer);
         
         return result;
@@ -94,13 +101,19 @@
     CocoaSecurityDecoder *decoder = [[CocoaSecurityDecoder alloc] init];
     NSData *aesKey = [decoder hex:key];
     NSData *aesIv = [decoder hex:iv];
+#if !__has_feature(objc_arc)
     [decoder release];
+#endif
     
     return [self aesDecryptWithBase64:data key:aesKey iv:aesIv];
 }
 - (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data key:(NSData *)key iv:(NSData *)iv
 {
+#if __has_feature(objc_arc)
+    CocoaSecurityDecoder *decoder = [[CocoaSecurityDecoder alloc] init];
+#else
     CocoaSecurityDecoder *decoder = [[[CocoaSecurityDecoder alloc] init] autorelease];
+#endif
     
     return [self aesDecryptWithData:[decoder base64:data] key:key iv:iv];
 }
@@ -134,9 +147,13 @@
                                           [data length],
                                           buffer,
                                           bufferSize,
-										  &encryptedSize);
+                                          &encryptedSize);
 	if (cryptStatus == kCCSuccess) {
+#if __has_feature(objc_arc)
+        CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:buffer length:encryptedSize];
+#else
         CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:buffer length:encryptedSize] autorelease];
+#endif
 		free(buffer);
         
         return result;
@@ -160,7 +177,11 @@
     digest = malloc(CC_MD5_DIGEST_LENGTH);
     
     CC_MD5([hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_MD5_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_MD5_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     
     return result;
@@ -177,7 +198,11 @@
     const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
     
     CCHmac(kCCHmacAlgMD5, cKey, strlen(cKey), [hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_MD5_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_MD5_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     cKey = nil;
     
@@ -195,7 +220,11 @@
     digest = malloc(CC_SHA1_DIGEST_LENGTH);
     
     CC_SHA1([hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA1_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     
     return result;
@@ -211,7 +240,11 @@
     digest = malloc(CC_SHA224_DIGEST_LENGTH);
     
     CC_SHA224([hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA224_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA224_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     
     return result;
@@ -227,7 +260,11 @@
     digest = malloc(CC_SHA256_DIGEST_LENGTH);
     
     CC_SHA256([hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA256_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA256_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     
     return result;
@@ -243,7 +280,11 @@
     digest = malloc(CC_SHA384_DIGEST_LENGTH);
     
     CC_SHA384([hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA384_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA384_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     
     return result;
@@ -259,7 +300,11 @@
     digest = malloc(CC_SHA512_DIGEST_LENGTH);
     
     CC_SHA512([hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA512_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA512_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     
     return result;
@@ -277,7 +322,11 @@
     const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
     
     CCHmac(kCCHmacAlgSHA1, cKey, strlen(cKey), [hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA1_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     cKey = nil;
     
@@ -295,7 +344,11 @@
     const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
     
     CCHmac(kCCHmacAlgSHA224, cKey, strlen(cKey), [hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA224_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA224_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     cKey = nil;
     
@@ -313,7 +366,11 @@
     const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
     
     CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), [hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA256_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA256_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     cKey = nil;
     
@@ -331,7 +388,11 @@
     const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
     
     CCHmac(kCCHmacAlgSHA384, cKey, strlen(cKey), [hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA384_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA384_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     cKey = nil;
     
@@ -349,7 +410,11 @@
     const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
     
     CCHmac(kCCHmacAlgSHA512, cKey, strlen(cKey), [hashData bytes], [hashData length], digest);
+#if __has_feature(objc_arc)
+    CocoaSecurityResult *result = [[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA512_DIGEST_LENGTH];
+#else
     CocoaSecurityResult *result = [[[CocoaSecurityResult alloc] initWithBytes:digest length:CC_SHA512_DIGEST_LENGTH] autorelease];
+#endif
     free(digest);
     cKey = nil;
     
@@ -376,7 +441,11 @@
 // convert CocoaSecurityResult to UTF8 string
 - (NSString *)utf8String
 {
+#if __has_feature(objc_arc)
+    NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
+#else
     NSString *result = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
+#endif
     
     return result;
 }
@@ -385,13 +454,21 @@
 // convert CocoaSecurityResult to HEX string
 - (NSString *)hex
 {
+#if __has_feature(objc_arc)
+    CocoaSecurityEncoder *encoder = [[CocoaSecurityEncoder alloc] init];
+#else
     CocoaSecurityEncoder *encoder = [[[CocoaSecurityEncoder alloc] init] autorelease];
+#endif
     
     return [encoder hex:data useLower:false];
 }
 - (NSString *)hexLower
 {
+#if __has_feature(objc_arc)
+    CocoaSecurityEncoder *encoder = [[CocoaSecurityEncoder alloc] init];
+#else
     CocoaSecurityEncoder *encoder = [[[CocoaSecurityEncoder alloc] init] autorelease];
+#endif
     
     return [encoder hex:data useLower:true];
 }
@@ -400,7 +477,11 @@
 // convert CocoaSecurityResult to Base64 string
 - (NSString *)base64
 {
+#if __has_feature(objc_arc)
+    CocoaSecurityEncoder *encoder = [[CocoaSecurityEncoder alloc] init];
+#else
     CocoaSecurityEncoder *encoder = [[[CocoaSecurityEncoder alloc] init] autorelease];
+#endif
     
     return [encoder base64:data];
 }
@@ -416,7 +497,11 @@
 {
     // base on GTMBase64
     NSString *result = [[NSString alloc] initWithData:[GTMBase64 encodeData:data] encoding:NSUTF8StringEncoding];
+#if __has_feature(objc_arc)
+    return result;
+#else
     return [result autorelease];
+#endif
 }
 
 // convert NSData to hex string
@@ -464,7 +549,11 @@
 {
     // base on GTMBase64
     NSData *result = [[NSData alloc] initWithData:[GTMBase64 decodeString:data]];
+#if __has_feature(objc_arc)
+    return result;
+#else
     return [result autorelease];
+#endif
 }
 
 - (NSData *)hex: (NSString *)data
diff --git a/CocoaSecurity/GTMBase64/CocoaSecurity-GTMBase64.m b/CocoaSecurity/GTMBase64/CocoaSecurity-GTMBase64.m
index cb1a0c9..aeaf5d2 100644
--- a/CocoaSecurity/GTMBase64/CocoaSecurity-GTMBase64.m
+++ b/CocoaSecurity/GTMBase64/CocoaSecurity-GTMBase64.m
@@ -283,8 +283,13 @@ GTM_INLINE NSUInteger GuessDecodedLength(NSUInteger srcLen) {
 								 charset:kBase64EncodeChars
 								  padded:YES];
 	if (converted) {
-		result = [[[NSString alloc] initWithData:converted
+#if __has_feature(objc_arc)
+		result = [[NSString alloc] initWithData:converted
+										encoding:NSASCIIStringEncoding];
+#else
+        result = [[[NSString alloc] initWithData:converted
 										encoding:NSASCIIStringEncoding] autorelease];
+#endif
 	}
 	return result;
 }
@@ -296,8 +301,13 @@ GTM_INLINE NSUInteger GuessDecodedLength(NSUInteger srcLen) {
 								 charset:kBase64EncodeChars
 								  padded:YES];
 	if (converted) {
-		result = [[[NSString alloc] initWithData:converted
+#if __has_feature(objc_arc)
+		result = [[NSString alloc] initWithData:converted
+										encoding:NSASCIIStringEncoding];
+#else
+        result = [[[NSString alloc] initWithData:converted
 										encoding:NSASCIIStringEncoding] autorelease];
+#endif
 	}
 	return result;
 }
@@ -362,8 +372,13 @@ GTM_INLINE NSUInteger GuessDecodedLength(NSUInteger srcLen) {
 								 charset:kWebSafeBase64EncodeChars
 								  padded:padded];
 	if (converted) {
-		result = [[[NSString alloc] initWithData:converted
+#if __has_feature(objc_arc)
+		result = [[NSString alloc] initWithData:converted
+										encoding:NSASCIIStringEncoding];
+#else
+        result = [[[NSString alloc] initWithData:converted
 										encoding:NSASCIIStringEncoding] autorelease];
+#endif
 	}
 	return result;
 }
@@ -377,8 +392,13 @@ GTM_INLINE NSUInteger GuessDecodedLength(NSUInteger srcLen) {
 								 charset:kWebSafeBase64EncodeChars
 								  padded:padded];
 	if (converted) {
-		result = [[[NSString alloc] initWithData:converted
+#if __has_feature(objc_arc)
+		result = [[NSString alloc] initWithData:converted
+										encoding:NSASCIIStringEncoding];
+#else
+        result = [[[NSString alloc] initWithData:converted
 										encoding:NSASCIIStringEncoding] autorelease];
+#endif
 	}
 	return result;
 }
diff --git a/CocoaSecurityTests/CocoaSecurityTests.m b/CocoaSecurityTests/CocoaSecurityTests.m
index a905ff1..1150da0 100644
--- a/CocoaSecurityTests/CocoaSecurityTests.m
+++ b/CocoaSecurityTests/CocoaSecurityTests.m
@@ -26,8 +26,8 @@
 
 - (void)testEncodeDecode
 {
-    CocoaSecurityDecoder *decoder = [[[CocoaSecurityDecoder alloc] init] autorelease];
-    CocoaSecurityEncoder *encoder = [[[CocoaSecurityEncoder alloc] init] autorelease];
+    CocoaSecurityDecoder *decoder = [[CocoaSecurityDecoder alloc] init];
+    CocoaSecurityEncoder *encoder = [[CocoaSecurityEncoder alloc] init];
     
     // HEX
     STAssertEqualObjects([encoder hex:[decoder hex:@"CC0A69779E15780ADAE46C45EB451A23"] useLower:false],
@@ -39,8 +39,8 @@
 
 - (void)testAES
 {
-    CocoaSecurity *cs = [[[CocoaSecurity alloc] init] autorelease];
-    CocoaSecurityDecoder *decoder = [[[CocoaSecurityDecoder alloc] init] autorelease];
+    CocoaSecurity *cs = [[CocoaSecurity alloc] init];
+    CocoaSecurityDecoder *decoder = [[CocoaSecurityDecoder alloc] init];
     
     // AES128
     CocoaSecurityResult *aes128 = [cs aesEncryptWithData:[@"kelp" dataUsingEncoding:NSUTF8StringEncoding]
@@ -78,7 +78,7 @@
 
 - (void)testMD5
 {
-    CocoaSecurity *cs = [[[CocoaSecurity alloc] init] autorelease];
+    CocoaSecurity *cs = [[CocoaSecurity alloc] init];
     CocoaSecurityResult *md5Result = [cs md5:@"kelp"];
     CocoaSecurityResult *hmacMd5Result = [cs hmacMd5:@"kelp" hmacKey:@"key"];
     
@@ -93,7 +93,7 @@
 
 - (void)testSHA
 {
-    CocoaSecurity *cs = [[[CocoaSecurity alloc] init] autorelease];
+    CocoaSecurity *cs = [[CocoaSecurity alloc] init];
     CocoaSecurityResult *sha1Result = [cs sha1:@"kelp"];
     CocoaSecurityResult *sha224Result = [cs sha224:@"kelp"];
     CocoaSecurityResult *sha256Result = [cs sha256:@"kelp"];
diff --git a/README.md b/README.md
index d8b38e9..129f614 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-##CocoaSecurity 1.0
+#CocoaSecurity 1.0.1
 
 Kelp http://kelp.phate.org/ <br/>
 MIT License <br/>
@@ -7,7 +7,7 @@ Apache Licence 2.0: GTMBase64 by Google Inc.
 
 CocoaSecurity include 4 classes, **CocoaSecurity**, **CocoaSecurityResult**, **CocoaSecurityEncoder** and **CocoaSecurityDecoder**.
 
-###CocoaSecurity
+##CocoaSecurity
 CocoaSecurity is core. It provides AES encrypt, AES decrypt, Hash(MD5, HmacMD5, SHA1~SHA512, HmacSHA1~HmacSHA512) messages.
 <br/><br/>
 **MD5:**
@@ -52,7 +52,7 @@ CocoaSecurityResult *aes256Decrypt = [cs aesDecryptWithBase64:@"WQYg5qvcGyCBY3IF
 ```
 
 
-###CocoaSecurityResult
+##CocoaSecurityResult
 CocoaSecurityResult is the result class of CocoaSecurity. It provides convert result data to NSData, NSString, HEX string, Base64 string.
 
 ```objective-c
@@ -64,7 +64,7 @@ CocoaSecurityResult is the result class of CocoaSecurity. It provides convert re
 ```
 
 
-###CocoaSecurityEncoder
+##CocoaSecurityEncoder
 CocoaSecurityEncoder provides convert NSData to HEX string, Base64 string.
 
 ```objective-c
@@ -80,7 +80,7 @@ NSString *str2 = [encoder base64:[@"kelp" dataUsingEncoding:NSUTF8StringEncoding
 // str2 = 'a2VscA=='
 ```
 
-###CocoaSecurityDecoder
+##CocoaSecurityDecoder
 CocoaSecurityEncoder provides convert HEX string or Base64 string to NSData.
 
 ```objective-c
diff --git a/iOS View/CocoaSecurityAppDelegate.m b/iOS View/CocoaSecurityAppDelegate.m
index 46b1ed2..e6df9d6 100644
--- a/iOS View/CocoaSecurityAppDelegate.m	
+++ b/iOS View/CocoaSecurityAppDelegate.m	
@@ -14,8 +14,8 @@
 
 - (void)dealloc
 {
-    [_window release];
-    [super dealloc];
+    //[_window release];
+    //[super dealloc];
 }
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions