How to remove encryption in digital signature

How to remove the encryption in the digital signatur
I sign document and signature encrypt document hence not allowing future amendments. How to remove encryption ??

Thanks George for the help, I managed to create my own ID using your
approach, Advanced > Security Settings > Digital IDs > add ID, but when I
signed it with the PDF of my signature, it is showed as my name in Typing
such as "XXX YY", instead of the handwritten form. I managed to use the
same PDF of my signature (signed and converted to PDF) last week when I
used the Pro 9, how can I attach my signature the same way in handwritten
form instead of being convered to "XXX YY" and appears "digitally signed"
Thanks again.

Similar Messages

How do I delete a digital signature field?

I have Adobe Acrobat Pro 9 on Snow Leopard. I created a digital signature for a PDF file but it didn't look good, so I decided to delete it. I figured out how to delete the signature, but the signature field with the little red arrow did not delete with my signature. I want my PDF form to revert to the way it was before I created the signature. I cannot simply close the PDF without saving because I'd lose all the information I've already entered. Stupid me forgot to save before attempting the digital signature.
HOW CAN I DELETE the digital signature field? Help!

Hi SM,
The place to look for permission settings is on the Security tab of the Document Properties dialog. You can get there by selecting the File > Properties menu item and then select the Security tab.
One thing to note is if the file is Reader Enabled you will need to use the File > Save a Copy menu item to create a non-Reader enabled version of the file. You cannot edit a Reader Enabled file. As an aside, the Save a Copy menu item won't be there if the file is not Reader Enabled.
If the file was created using Designer (which is only on Windows and I know you are using a Mac) then it has to be edited in Designer.
If the file was certified, then you need to remove (clear) the certifying signature before you can edit the file, and to do that you must have access to the private key that was used as part of that signature operation.
Finally, if the file is encrypted (e.g. Password Security or Certificate Security), you can edit the file, but you have to get Acrobat to realize you are the document owner which means you need the Permissions password or or logged in using a document owners digital ID (the former is only for Password Security and the latter is only for Certificate Security).
Steve

Outlook 2013 won't auto-save emails if encryption or digital signature is enabled.

In Outlook 2013, I recently noticed that although I have Autosave enabled, I never get drafts autosaved. The option is located in File > Options > Mail > "Save Messages" section > "[ ] Automatically save items that have not been
sent after this many minutes [3]."
Experimenting with why I have lost 2 long emails after system crashes, I discovered that Outlook 2013 will
only automatically save emails if the Encrypt and Sign buttons are turned off. By default, I enable both in our corporate environment. So I never benefit from auto-save. I've changed the Autosave location and tested various other settings to
no avail. But Autosave always works fine if there's no digital signature or encryption enabled.
Has anyone else encountered this? Is this a bug?

Hi,
I just tested on my Outlook 2013 and experienced exactly the same.
This is pretty much by design, actually you may find you are even unable to manually save these emails as drafts if encryption or digital signature is enabled. I can also confirm some email service providers don't allow saving Encrypted Emails
as drafts either, so this is not a bug but how it works in Outlook.
Regards,
Melon Chen
TechNet Community Support

In Adobe X Pro, how do I create a digital signature in my document so that my receiver is able to sign it electronically.

In Adobe X Pro, how do I create a digital signature in my document so that my receiver is able to sign it electronically.

If the other person will be using Reader, you should first add a digital signature field and then Reader enable the form. In Acrobat 10 you'd select: Tools > Forms > Edit
to get into form editing mode. You'd then select the signature field tool to add a signature field.
Once you have the document finalized, Reader-enable the document by selecting: File > Save As > Reader-Extended PDF > Enable Additional Features
being sure to save to a new file so you don't overwrite the original. If you don't Reader-enable, Reader users won't be able to digitally sign.

Encrypting a digital signature

Hi,
I have a problem, I'm trying to encrypt a digital signature (SHA1withRSA) using symmetric encryption (Rijndael). But when I decrypt the signature bytes and verify the signature I get the message that the signature is not ok, even though I know it is.
Does anybody know what's the problem?

Hi floersh
Thanks for answering.
I'm sending you the code which I use, the functions and the main method.
Please, if you have the time give it a look.
Running the code I noticed that :
1) The message digest is 20-bytes long
2) The signature is 128-bytes long
3) The encrypted signature is 32-bytes long
4) The decrypted ciphertext (signature) is 16-bytes long
And I also noticed that the decrypted signature bytes are the same with the 16 last bytes of the original signature.
As you can see I'm using SHA1withRSA to create and verify the signature, where the public and private keys are 1024-bits long, and the Rijdael (192-bits key)cipher, with CBC and PKCS5Padding, for symmetric encryption and decryption. I have also tried to use Rijndael with ECB and PKCS5Padding and still doesn't work, and Rijndael with ECB and NoPadding where I get a BadPadding exception.
I look forward for your reply.
public static void generateAndLockKeys(String publicKeyFilename,String privateKeyFilename) throws Exception{
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(1024);
KeyPair keyPair = keyPairGenerator.genKeyPair();
byte[] publicKeyBytes = keyPair.getPublic().getEncoded();
FileOutputStream fos = new FileOutputStream(publicKeyFilename);
fos.write(publicKeyBytes);
fos.close();
byte[] privateKeyBytes = keyPair.getPrivate().getEncoded();
fos = new FileOutputStream(privateKeyFilename);
fos.write(privateKeyBytes);
fos.close();
public static PrivateKey getPrivateKey(String privateKeyFilename, String password) throws Exception{
FileInputStream fis = new FileInputStream(privateKeyFilename);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int theByte = 0;
while ((theByte = fis.read())!= -1)
baos.write(theByte);
fis.close();
byte[] keyBytes = baos.toByteArray();
baos.close();
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
return privateKey;
public static PublicKey getPublicKey( String publicKeyFilename) throws Exception{
FileInputStream fis = new FileInputStream(publicKeyFilename);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int theByte = 0;
while ((theByte = fis.read())!= -1)
baos.write(theByte);
fis.close();
byte[] keyBytes = baos.toByteArray();
baos.close();
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(keySpec);
return publicKey;
public static boolean checkSignature( PublicKey publicKey, byte[] plaintext, byte[] signedtext) throws Exception{
Signature signature = Signature.getInstance("SHA1withRSA");
signature.initVerify(publicKey);
signature.update(plaintext);
boolean authorized = false;
authorized = signature.verify(signedtext);
return authorized;
public static byte[] signWithSHAAndRSA(byte[] plaintext, PrivateKey privateKey) throws Exception{
Signature signature = Signature.getInstance("SHA1withRSA");
signature.initSign(privateKey);
signature.update(plaintext);
byte[] signedBytes = signature.sign();
return signedBytes;
public static byte[] encryptWithAES(byte[] plaintext, Key key, byte[] iv) throws Exception{
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
IvParameterSpec spec = new IvParameterSpec(iv);
cipher.init(Cipher.ENCRYPT_MODE, key,spec);
cipher.update(plaintext);
byte[] ciphertext = cipher.doFinal();
return ciphertext;
public static byte[] decryptWithAESKey (Key AESKey, byte[] ciphertext, byte[] iv) throws Exception{
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
IvParameterSpec spec = new IvParameterSpec(iv);
cipher.init(Cipher.DECRYPT_MODE,AESKey,spec);
byte[] decryptedText = cipher.doFinal(ciphertext);
return decryptedText;
public static Key generateAESKey() throws Exception {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(192);
Key key = keyGenerator.generateKey();
return key;
public static byte[] initAndReturnIV(){
SecureRandom random = new SecureRandom();
byte[] iv = new byte[16];
random.nextBytes(iv);
return iv;
public static void main(String[] args) throws Exception{
Security.addProvider(new BouncyCastleProvider());
try {
generateAndLockKeys(System.getProperty("user.dir") + System.getProperty("file.separator") +
"PublicKey",System.getProperty("user.dir")
+ System.getProperty("file.separator") +"PrivateKey");
} catch (Exception e) {}
Key AESKey= generateAESKey();
byte[] iv = initAndReturnIV();
byte[] array2 = signWithSHAAndRSA("Hello".getBytes("UTF8"),getPrivateKey(System.getProperty("user.dir")
+ System.getProperty("file.separator") +"PrivateKey"));
byte[] he = encryptWithAES(array2,AESKey,iv);
byte[] hd = decryptWithAESKey(AESKey,he,iv);
boolean ok = checkSignature(getPublicKey(System.getProperty("user.dir") + System.getProperty("file.separator") +
"PublicKey"),"Hello".getBytes("UTF8"),hd);
}

How to export & reconstruct a digital signature

I would like to submit a reader-enabled pdf form with a digital signature from within a browser.
I'm currently using CoSign Digital Signature to successfully create the signature. I have created a test form with Acrobat X Pro and assigned the "Submit a Form" action to the submit button. The form is configured to submit to a perl cgi, with the Export Format set to FDF with the following settings...
- Field Data
- Incremental changes to the PDF
The post data is received as the POSTDATA parameter and printed back to the browser as content-type: application/vnd.fdf. However, when the fdf is printed back to the browser the digital signature is not included in the signature field. The rest of the form is populated successfully. If I log the POSTDATA value, I can see what appears to be the digital signature.
According to the Adobe docs...
"FDF Exports as an FDF file. You can select one or more of the available options: user-entered data, comments, and incremental changes to the PDF file. The Incremental Changes To The PDF option is useful for exporting a digital signature in a way a server can easily read and reconstruct."
My question is, how do I reconstruct the digital signature so that I can save it offline within the PDF file?
Thanks

You can't sign a blank document simply by importing an FDF. The data is in the FDF, but the appened saves (aka incremental change) would have to be extracted from the FDF (e.g., using the no longer supported FDF Toolkit) and then concatenated with the original blank form that was used by the person who filled-in and signed. I can't say for sure this will work any more anyway as Acrobat/Reader has changed the way this works and does a Save As (as opposed to Save) when a document is signed, so there is no incremental change data any longer.

Encryption and Digital signature in SAP

Hi,
We have a requirement to encrypt the payment data before it is sent to a Bank using SAP XI.We are planning to have a ABAP proxy which will do the encryption and hopefully attach a digital signature.We are working in SAPR/3 Enterprise edition.Does SAP supports doing Encryption and digital signature in ABAP.
Thanks,
Leo

Hi Leo,
have a look here:
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/icc/secure store and forwarddigital signatures user guide.pdf
regards Andreas

How can I disable the digital signature feature?

how can I disable the digital signature feature?

If it can be done (doubtful) there will be details in the Enterprise Deployment documentation. Enterprise Deployment (Acrobat and Reader)

How many space takes a digital signature

Hello,
I wait for the activation key of JCOP to use with Eclipse. so I can try nothing, only plan and clue some code snippets together. For planning my data structures I need to know how big a digital signature is.
Thank you very much.
mimaxx

It depends on the encryption algorithm you use to create the actual signature, i.e. if you use 1024 bit RSA, the signature will be 1024 bit. Easy peacy.

How to create table and digital signature ?

Hello,
I would like to ask two questions regarding SAP interactive forms by adobe.
1st question:
How to create table in interactive form?
Table that i can add rows and column and will show it in the form.
Example the rows and columns that i want:
ID: Name: DOB:
1 Jack 01/02/80
2 Ivy 10/12/82
2nd question:
How to create digital signature ?
I'm creating a adobe forms which need employee to sign on the form. I use signature field at my form. However, i don't know how to create a new signature and insert in the signature field.
Can any one provide the answer with step by step guide?
Thanks a lot

Hi Pradeepa,
you said you have your digital signature in
BMP format? That means Bitmap and would mean you are actually talking about a picture! THIS IS NOT A DIGITAL SIGNATURE!
A digital signature is a cryptographic key (aka public key cryptography) that is used to digitally sign a document, or at least a hash value derived from the document. Digitally signing means, applying the key in a well defined way (this is the algorithm used) to the document or hash value. You do this with your private key and the receiver of the document can then use your public key (which you can distribute in any way you want, even unsecure) to unencrypt the hash value. If this succeeds the receiver knows that the document was signed by you.
This is because both keys are mathematically related in such a way, that what one key encrypted can only be decrypted by the corresponding other key and by no other key. You even can´t decrypt a document with the same key it was encrypted with, this is the difference to symmetric encryption - please have a look at help.sap.com and search for digital signatures.
The named formats (afs, pfx and p12) are ways of coding the key, together with information about your person, such as email address and information about validity of the key into a
certificate. This type of certificate is then called a x.509 certificate and is the same you might have seen when connecting to a secure webserver such as the one of your bank website.
Signing a form with such a certificate provides for mathematically and therefore business related proove of a users identity.
In case you are really using a bitmap, this cannot work and would not serve you any good.
Ask yourself this question: I want to make sure that the form was signed by a specific person. How can I make sure that the signing can only be done by the person pretending to have done so?
A bitmap contains a picture, probably of the persons handwritten signature. How can I make sure that this picture was NOT recreated in MS Paint or Photoshop by someone else?
The answer is:
you can't! Therefore this way of prooving identity is useless.
You need to provide your users with digital signatures, put these in the certificate cache of your IE. If a user then clicks on the signing field, the private key is used to digitally sign the form - create a hash value of the form and encrypt it with the private key. After the form is send back to the server or you, you use the corresponding public key to decrypt the hash value and, as said above, if this succeeds, identity of the signer is proven.
THIS IS AN OVERSIMPLIFICATION! You might want to take a look at Adobe Reader Credentials.
Regards,
 Christian

How do I add a digital signature to my online form?

With regular Adobe (Standard or Professional) software, you can add a digital signature line. I want to know how I can do it on FormCentral.
When I PDF the form I created on FormCentral and try to add the digital signature in Adobe, I get a message that I cannot due to security settings of the document.

Formscentral does not support forms with digital signature workflows. I suggest you see if our Echosign product meets your needs.

How do I create a digital signature on a TCP or a UDP flow?

I am trying to convert samples of a voice signal, which is intercepted from the microphone, into fixed length digital signature bytes (using Hash, or) and attach these fixed length bytes to a communication session between two terminals (UDP or TCP "HTTP"). The other receving end should be able to identify the person at the sending side.
Any thoughts how I could do this?
Any help is most appreciated.
Sam

Sam,
If you have the Sound and Vibration toolkit it may make some things easier for you regarding the voice-recording aspect, but if you aren't recording and playing back the actual sounds, just using this for detection and digital signatures, you shouldn't need to worry about this.
1. For this you are going to be doing some form of Analog Input. Then you will be storing this data to a file. There are examples for both of these aspects in the NI Example Finder from within LabVIEW.
2. If you are going to be doing the FFT, there is a VI under the Mathematics Palette that performs this operation. Again you can use the same example for saving data to the file.
3. You would need to figure out what needs to be done to create a digital signature for this. There may be something in the Sound and Vibration toolkit for this, but I do not know.
4. For the UDP or TCP transfers, there are several examples for doing this and they cover how to create the connection and transfer / receive data. These too are in the NI Example Finder
5. This goes back to number 4, this would indeed be a separate program, but everything else would just be one project and one program.
6. This would depend on how the ID was created in step 3, again whether you do the algorithm on yourself or not. For comparing to the table, you would use a Search Array and some comparison functions, all depending on how you stored the data initially.
7. Graphs are all available on your Front Panel of your VIs and you would just wire up the data that you'd like and have it displayed on the graph.
There will not be an example for everything that you are wanting to do. The examples are meant to help you get started. Have you used LabVIEW before? I would recommend doing the 3 Hour LabVIEW Introduction Course to help you get started. This will cover some of the basic concepts that you will need to know in order to create your application.
Unfortunately I cannot write the code for you, only guide and direct you. LabVIEW is a programming language and does require the user to lay out and create their own program. You will not be able to just find three or four pre-built code-snippets and connect them together to get your appliction working the way you want it. You will need to develop the applications yourself.
Regards,
Jared Boothe
Staff Hardware Engineer
National Instruments

How do I delete a digital signature in adobe acrobat 8 as it has been spelt incorrectly?

A digital signature was created in adobe acrobat 8 professional but has been spelt incorrectly - how can I delete or edit it?

What if you do this:
To delete photos from your device
In iTunes, select the device icon in the Devices list on the left. Click the Photos tab in the resulting window.
Choose "Sync photos from."
On a Mac, choose iPhoto or Aperture from the pop-up menu.
On a Windows PC, choose Photoshop Album or Photoshop Elements from the pop-up menu.
Choose "Selected albums" and deselect the albums or collections you want to delete.
Click Apply.
But I do not think it will work since you can only sync/unsync with one iTunes library and the iPod sees the rebuilt computer as a new iTunes library.
- Do the following to restore the iPod and not lose anything:
- iTunes Store: Transferring purchases from your iOS device or iPod to a computer
- Transfer other music by using a third-party program like one of those discussed here:
Copy music
- If you have synced photos then you need a program like TouchCopy or PhoneView which are paid. They also do music.
- Connect the iPod to the conmputer and make a backup by right clicking on the iPod under Devices iniTunes and slect Back Up
- Restore the iPod from that backup
Note that the backup that iTunes makes does not included synced media like apps and music.

How do I create a digital signature to use when filling out applications online?

The application is asking me to add or create a digital ID to sign and encrypt documents. The certificate that comes with your digital ID is sent to others so that they can verify your signature.
I have four options: Browse for an existing digital ID file
Configure a roaming ID for use on this computer
Create a self-signed digital ID for use with Acrobat
Look for newly inserted hardware tokens

Formscentral does not support forms with digital signature workflows. I suggest you see if our Echosign product meets your needs.

How do I do a digital signature using the inbuilt camera

I am using a MacBook Pro 13" and today I was shown in PC world how to use a digital signature by using the inbuilt camera. Is this possible with this model or is it only with the Retina models?

You may find this article helpful.
http://9to5mac.com/2014/02/15/how-to-use-preview-to-put-signatures-on-pdfs-pages -documents-and-mail-messages/
Click the blue Reader button at the end of Safari address bar for easy viewing.

How to remove encryption in digital signature

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