Need Technical Support?
X
Please type your technical question in the search box below:
Loading Customer Support
close
CoSign by ARX
      
Forum   |
Support   |

Digital & Electronic Signature FAQ

Digital Signature FAQ CoSign FAQ Digital Certificate FAQ CoSign Trial FAQ CoSign Desktop FAQ Glossary

What is an Electronic Signature and a Digital Signature?

What is a digital signature? What is an electronic signature? How do they work? Why do companies use electronic signatures? The following FAQ (Frequently Asked Questions) for electronic signatures addresses both the business and technology aspects of digital and electronic signatures.

Digital signature solutions can automate your formal approvals affordably, allowing you to go paperless, cut costs and expedite your business processes.


Electronic and Digital Signature FAQ

A Digital signature (standard electronic signature) takes the concept of traditional paper-based signing and turn it into an electronic "fingerprint.” This "fingerprint,” or coded message, is unique to both the document and the signer and binds both of them together. The digital signature ensures the authenticity of the signer. Any changes made to the document after it is signed invalidate the signature, thereby protecting against signature forgery and information tampering. E-signatures help organizations sustain signer authenticity, accountability, data integrity and non-repudiation of electronic documents and forms.

Watch video to see how a digital signature works.  

An electronic signature is defined as an electronic sound (e.g., audio files of a person's voice), symbol (e.g., a graphic representation of a person in JPEG file), or process (e.g., a procedure that conveys assent), attached to or logically associated with a record, and executed or adopted by a person with the intent to sign the record. An electronic signature is easy to implement, since something as simple as a typed name can serve as one. Consequently, e-signatures are very problematic with regards to maintaining integrity and security, as there is nothing to prevent one individual from typing another individual's name. Due to this reality, an electronic signature that does not incorporate additional measures of security (similar to a digital signature, described above) are considered an insecure way of signing documentation.

A digital signature, often referred to as advanced or standard electronic signature, is a sub group within electronic signatures which provide the highest form of signature and content integrity as well as universal acceptance. The digital signature is based on Public Key Infrastructure (PKI) and is a result of a cryptographic operation that guarantees signer authenticity, data integrity and non-repudiation of signed documents. The digital signature cannot be copied, tampered or altered. In addition, because they are based on standard PKI technology, digital signatures made within one application (e.g. Microsoft® Word, Adobe® PDF) can be validated by others using the same applications. On the other hand, an electronic signature is a proprietary format (there is no standard for electronic signatures) that is an electronic data, such as a digitized image of a handwritten signature, a symbol, voiceprint, etc., that identifies the author(s) of an electronic message. An electronic signature is vulnerable to copying and tampering, making forgery easy. In many cases, they are not legally binding and will require proprietary software to validate the e-signature.

It is estimated that 30 billion paper documents are copied or printed by US companies annually. When factoring copying, scanning, archiving, routing, and retrieving lost documents, the associated costs of each signature are estimated at $6.50 each. The average authorized employee signs 500 documents a year at a total cost of $3,250. Organizations are implementing electronic signature solutions to:

  • Cut operational costs   
  • Automate and expedite business processes  
  • Address legal compliance and limit liability 
  • Go green

Calculate the return on investment of implementing a digital signature solution in your organization by downloading our digital signature ROI whitepaper and Excel spreadsheet.

Perform a quick ROI calculation with our online digital signature ROI calculator.  

Many aspects of an organization's workflow processes require formal authorizations or approvals. The table below outlines samples of these documents and processes:

Executive Management / Board Documents
Board Actions, Corporate Communications and Public Reports, Investor Relations, SEC Documents
HR Documents
Employee Actions, Employee Benefit Changes, Employee On-Boarding Documents, Employee Time Sheets, Employee Training Acknowledgements, Periodic Forms, Performance Reviews, Insurance Claims
Legal Documents
Contracts, Agreements, Work orders, Master Service Agreement Forms, and Sub-contractor Agreements
Finance/Accounting Documents
Lease Agreements, Loan Agreements, Expense Reports & Reimbursement Approvals, Invoices, Tax Filings, Financial Spreadsheets (Data Collection and Aggregation), Disbursements (Check, Wire Transfer Orders, and ACH Transactions), Journal Entries related to Accounting and General Ledger, Purchase Requests, Gift Records

Customer Service Documents

Customer service change orders

Procurement Documents

Purchase Orders, Contracts with subcontractors

Sales Documents

Sale Proposals, Point of Sale/Service, Contracts with clients

Regulatory Affairs

Applications, Submissions, etc.

Quality Control

QC Documents, Standard Operating Procedures, Policies, Work Instructions, and Training Documents, Test Procedures, Field Service, Maintenance, and Calibrations Reports   

Other Industry Specific Documents

Designs, Drawings, Plans, Manufacturing Instructions and Reports, HIPAA patient and consent forms, Medical Records, Clinical Documentation, Lab Reports, and Certificates of Analysis

Using Bob and Alice, we can illustrate how a standard digital signature (standard electronic signature) is applied and verified.

From Bob's perspective, the signing operation can be as simple as a click of a button. But several things are happening with that one click:

 
1.

Step 1: Getting a Private and Public Key

In order to electronically sign documents with standard digital signatures, Bob needs to obtain a Private and Public Key - a one-time setup/operation. The Private Key, as the name implies, is not shared and is used only by the signer to sign documents. The Public Key is openly available and used by those that need to validate the signer's digital signature.        
Private and Public Key Certificate
Private and Public Key Certificate
Click to enlarge
2.

Step 2: Signing an Electronic Document

  1. Initiate the signing process - Depending on the software used, Bob needs to initiate the signing process (e.g., clicking a "Sign" button on the software's toolbar).
  2. Create a digital signature - A unique digital fingerprint of the document (sometimes called a message digest or document hash) is created using a mathematical algorithm (such as SHA-1). Even the slightest difference between two documents would create a separate digital fingerprint of each.
  3. Append the signature to the document - The hash result and the user's digital certificate (which includes his Public Key) are combined into a digital signature (by using the user's Private Key to encrypt the document hash). The resulting signature is unique to both the document and the user. Finally, the digital signature is appended to the document.

Bob sends the signed document to Alice. Alice uses Bob's public key (which is included in the signature within the Digital Certificate) to authenticate Bob's signature and to ensure that no changes were made to the signed document after it was signed.

3.

Alice:

  1. Initiates the validation process - Depending on the software used, Alice needs to initiate the validation process (e.g., clicking a "Validate Signature" menu option button on the software's toolbar).    
  2. Decrypts Bob's signature - Using Bob's Public Key Alice decrypts his signature and she receives the original document (the document fingerprint).          
  3. Compares Bob's document fingerprint with her calculated one - Alice's software then calculates the document hash of the received document and compares it with the original document hash (from the previous step). If they are the same, the signed document has not been altered.

There is yet another factor involved. How can Alice know whether Bob is indeed the same person she intends to conduct business with, or even that it is really Bob? Bob needs to be certified by a trusted third party that knows him and can verify that he is indeed who he claims to be. These trusted third parties are called Certificate Authorities (CA). They issue certificates to ensure the authenticity of the signer. Certificates can be compared to passports issued by countries to their citizens for world travel. When a traveler arrives at a foreign country, there is no practical way to authenticate the traveler's identity. Instead, the immigration policy is to trust the passport issuer (in PKI terminology, the CA) and use the passport to authenticate its holder in the same way that Alice uses the CA's certificate for authenticating Bob's identity.

Validating the Digital Signature
Validating the Digital Signature
Click to enlarge
Learn about digital certificates, how they work and why companies use them in the Digital Certificates FAQ. The FAQ addresses both business and technology aspects of digital certificates.

Yes. In 1999, the EU passed the “EU Directive for Electronic Signatures” and on June 30, 2000, President Clinton signed into law the Electronic Signatures in Global and National Commerce Act ("ESIGN"), which made signed electronic contracts and documents as legally binding as a paper-based contract.

Today, digital signature solutions (standard electronic signature) carry recognized legal significance, allowing organizations to comply with regulations worldwide. Learn more about the laws passed regarding the use of digital signature solutions.

In recent years, most countries worldwide have adopted legislation and regulations that recognize the legality of a digital signature (standard electronic signature) and deem it a binding signature. In addition to governments, many industries have established regulations (e.g., FDA 21 CFR Part 11 in the Life Sciences industry) that define digital signatures as a replacement for handwritten signatures.

Since CoSign is a digital signature solution, a secure form of e-signatures, it can provide legal compliance in the most tightly regulated industries and geographies. CoSign offers a solution that is FIPS 140-2 Level 3 certified and is based on the Digital Signature Standard (FIPS 186-2). With the proper standard operating procedures in place, CoSign can comply with ESIGN, EU Directives and VAT law, FDA 21CFR part 11, HIPAA and SOX.

Legislation

For additional information on other countries, visit the Digital Signature Law Survey.

Industry Regulations and Standards

The average e-signature user signs just over 2 documents per workday, or 500 per year (based on CoSign customer usage statistics). These numbers equal a usage reduction of half of a tree, ¾ of a barrel of oil, and 150 pounds of carbon emissions per signer, per year.

Important milestones in the acceptance of digital signature solutions (standard electronic signature solutions) into business practices took place in 1999 and 2000 respectively, when the EU passed the “EU Directive for Electronic Signatures” and President Clinton signed into law the Electronic Signatures in Global and National Commerce Act ("ESIGN").

Furthermore, legal precedents are being established that confirm the validity of electronic documents and contracts. Following are a few examples:

  • Cloud Corp. v. Hasbro Inc., 314 F.3d 289 (7th Cir. 2002) - electronic documentation satisfied the Statute of Frauds.  
  • Sea-Land Service, Inc. v. Lozen International, LLC, 285 F.3d 808; 2002 WL 496943 (9th Cir. 2002) – ruled that an internal company e-mail was admissible evidence.  
  • Moore v. Microsoft Corp., 741 N.Y.S.2d 91 (April 5, 2002) – By clicking “I agree,” the terms of the End User License Agreement were valid and binding.

Nicholas Leeson forged handwritten signatures of his boss and caused the collapse of Barings Bank, the United Kingdom's oldest investment bank. While both the handwritten and digital signature (standard electronic signature) are legally-binding, only the digital signature ensure non-repudiation of documents. For example, any changes made to an electronically signed document are clearly indicated and will immediately invalidate the signature, thereby protecting against forgery.

Yes. Standard digital signatures “seal” documents:
  • Providing evidence of user authenticity (verifies the signer’s identity)
  • Guaranteeing data integrity (data has not been altered since the document was signed) 
  • Ensuring non-repudiation of signed electronic documents 
  • Complying with regulations
For additional information, please see How safe are digital signatures vs. handwritten signatures? (above)

What considerations should be taken into account when choosing a digital signature (standard electronic signature) solution that will maximize the business benefits of moving to a paperless environment? 

  1. Seals the document: Some solutions offer a weak, non-standard electronic signature, which can be tampered and are not legally binding. It is best to choose a solution that is based on digital signature technology (PKI – Public Key Infrastructure), thereby guaranteeing document integrity and legal compliance.  
  2. Compliance: Review the regulations within your industry, ensuring the electronic signature solution addresses all industry requirements.  
  3. Multiple Application Support: Some solutions offer electronic signature support for Microsoft® Word or PDF documents only. Find a solution that supports all applications in order to address current, as well as future, business requirements. 
  4. Transportability: Ensure the electronic signature is part of the document and that the signed documents may be validated by an outside user without having to install a proprietary software application. 
  5. Graphical Signature Support: Although graphical signatures are not technically or legally mandated, a graphical e-signature has the psychological benefit of easing the transition to a paperless environment, because the e-signature on the electronic document appears as it would on a paper document. 
  6. Seamless User Registration: Ask the vendor how users are enrolled and how changes to user information are updated. Many electronic signature solutions require a new user to go through a complex software “wizard” or go through several steps to enroll or update their information. For fast rollout and easy adoption within the organization, registration should be transparent to the user.
  7. Multiple Signings on the Same Document: Some electronic signature solutions allow for only one e-signature on a document. Look for a solution that can support your business logic and multiple signatures on the same document. 
  8. Simple To Use: Some electronic signature solutions require multiple steps to e-sign a document. It should only take 1 or 2 mouse-clicks to ensure that the document is sealed and legally enforceable. 
  9. Zero IT Management: The electronic signature solution should be operational as soon as it is deployed. Help desk and IT support should be minimal.
  10. Low Total Cost Of Ownership: Remember to account for initial cost, deployment, help desk, digital certificates (which may be a recurring annual cost) and development of support for the applications that require electronic signatures.

Please reference How to Choose the Best Electronic Signature Software for more detailed information on choosing the best e-signature solution for your business.

Public Key Infrastructure (PKI) is the basis for the digital signature (standard electronic signature) today. PKI provides each user with a pair of keys, a Private Key and a Public Key, used in every signed transaction. The Private Key, as the name implies, is not shared and is used only by the signer to electronically sign documents. The Public Key is openly available and used by those that need to validate the signer’s electronic signature. PKI encompasses different components which include a Certificate Authority (CA), end-user enrollment software, and tools for managing, renewing, and revoking keys and certificates.

Qualification as an SSCD is necessary for a digital signature (standard electronic signature) solution to comply with the EU Directive for Electronic Signatures. An SSCD is defined by the EC Directive 99/93 on Electronic Signatures as follows:

  • Secure signature-creation devices must, by appropriate technical and procedural means, ensure: 
  • The signature-creation data used for signature generation can occur only once, and that their secrecy is reasonably assured. 
  • The signature-creation data used for signature generation cannot, with reasonable assurance, be derived and the signature is protected against forgery using currently available technology. 
  • The signature-creation data used for signature generation can be reliably protected by the legitimate signatory against the use of others. 
  • Secure signature-creation devices must not alter data to be signed or prevent such data from being presented to the signatory prior to the signature process.

For centuries, signatures have been the most accepted means of authentication. Roman law recognized a combination of seals and signatures as the primary source for authenticating documents and legal contracts. The 1830s saw the first signs of electronic communications and legally recognized “electronic” signatures with the invention of the telegraph and Morse Code.

But, it was the introduction of public key cryptography by Martin Hellman and Whitfield Diffie in 1976, that established the first practical method of distributing cryptographic keys over an unprotected public network.
Click here for a complete glossary of electronic signature-related terms.  
2 Minute Overview

Want to try CoSign for free?

Connect with CoSign users in our forum!