diff --git a/MASFoundation/Classes/_private_/categories/NSMutableData+MASASN1Helper.h b/MASFoundation/Classes/_private_/categories/NSMutableData+MASASN1Helper.h
index 2ec10b7d..e54109e0 100644
--- a/MASFoundation/Classes/_private_/categories/NSMutableData+MASASN1Helper.h
+++ b/MASFoundation/Classes/_private_/categories/NSMutableData+MASASN1Helper.h
@@ -58,7 +58,7 @@
 
  @param value NSString of UTF8 string
  */
-- (void)appendUTF8String:(NSString *)value;
+- (void)appendUTF8StringASN1:(NSString *)value;
 
 
 
@@ -67,6 +67,6 @@
 
  @param data NSData of Bit string
  */
-- (void)appendBITString:(NSData *)data;
+- (void)appendBITStringASN1:(NSData *)data;
 
 @end
diff --git a/MASFoundation/Classes/_private_/categories/NSMutableData+MASASN1Helper.m b/MASFoundation/Classes/_private_/categories/NSMutableData+MASASN1Helper.m
index 41eef832..97f6f4ef 100644
--- a/MASFoundation/Classes/_private_/categories/NSMutableData+MASASN1Helper.m
+++ b/MASFoundation/Classes/_private_/categories/NSMutableData+MASASN1Helper.m
@@ -18,7 +18,7 @@ - (void)appendSubjectItem:(uint8_t[])attribute size:(int)size value:(NSString *)
 {
     NSMutableData *subjectItem = [[NSMutableData alloc] initWithCapacity:128];
     [subjectItem appendBytes:attribute length:size];
-    [subjectItem appendUTF8String:value];
+    [subjectItem appendUTF8StringASN1:value];
     [subjectItem encloseWith:0x30]; // Sequence tag
     [subjectItem encloseWith:0x31]; // Set tag
     
@@ -68,14 +68,14 @@ + (NSData *)buildPublicKeyForASN1:(NSData *)publicKeyBits
     [publicKeyASN encloseWith:0x30];    // Sequence tag
     [publicKeyASN prependByte:0x00];
     
-    [publicKeyData appendBITString:publicKeyASN];
+    [publicKeyData appendBITStringASN1:publicKeyASN];
     [publicKeyData encloseWith:0x30];   // Sequence tag
     
     return publicKeyData;
 }
 
 
-- (void)appendUTF8String:(NSString *)value
+- (void)appendUTF8StringASN1:(NSString *)value
 {
     //
     // UTF8STRING type
@@ -87,7 +87,7 @@ - (void)appendUTF8String:(NSString *)value
 }
 
 
-- (void)appendBITString:(NSData *)data
+- (void)appendBITStringASN1:(NSData *)data
 {
     //
     //  BIT string
diff --git a/MASFoundation/Classes/_private_/services/security/MASSecurityService.m b/MASFoundation/Classes/_private_/services/security/MASSecurityService.m
index a3121fbd..a48a63a2 100644
--- a/MASFoundation/Classes/_private_/services/security/MASSecurityService.m
+++ b/MASFoundation/Classes/_private_/services/security/MASSecurityService.m
@@ -188,7 +188,7 @@ - (NSString *)generateCSRWithUsername:(NSString *)userName publicKeyBits:(NSData
     uint8_t zero = 0;
     [signdata appendBytes:&zero length:1];
     [signdata appendBytes:signature length:signature_len];
-    [certificateSigningRequest appendBITString:signdata];
+    [certificateSigningRequest appendBITStringASN1:signdata];
     
     [certificateSigningRequest encloseWith:0x30];