Digital Signature vs Digital Certificate

1 Star2 Stars3 Stars4 Stars5 Stars (2 votes, average: 5.00 out of 5)
Digital Signature vs Digital Certificate

Comparing Digital Signature and Digital Signature Certificate

Digital Signature vs Digital Certificate: The primary difference between these terms is that the former aims to safeguard an electronic file from tampering. The implementation of the latter boosts the credibility of a website.

A digital signature is an electronic document attachment that serves as a unique identification and protection against unauthorized modifications. Its goal is to encode the file to protect its confidentiality and integrity. In contrast, a digital certificate certifies a user’s identity during a web-based transaction. It protects against unauthorized user-to-website data exchanges.

Are these two terms still confusing you? If this is the case, I recommend reading the entire article because it goes into great depth on digital signatures vs digital certificates.

What is a Digital Signature?

A digital signature functions as an electronic fingerprint or an appended element to a digital document, guaranteeing its authenticity and integrity.

Digital signatures, often known as electronic signatures, are classified into three types:

  • Class 1 Signatures: Verifies the association between an email address and its owner, ensuring email authenticity.
  • Class 2 Signature: Validates a person’s identification by comparing it to a pre-verified database.
  • Class 3 Signature: The Registering Authority grants the validation of the signee in online shopping and electronic tendering platforms by validating the individual applying in person, thus validating the legitimacy.

Note: The Certifying Authorities’ Controller released a notice to the Certifying Authorities (CA), stating that they would only grant class-3 DSC from January 1, 2021.

How to Ensure Message Integrity and Authenticity through Digital Signatures

  1. Generate a Message Digest: The hash function applies to the message, generating a message digest. This message digest represents a unique digital fingerprint of the message.
  2. Encrypt with Private Key: The sender’s private key encrypts the message digest. This encryption process forms the digital signature, combining the message digest with the sender’s private key.
  3. Message and E-Signature Transmission: The sender delivers the signed digital file to the recipient.
  4. Decrypt Using the Sender’s Public Key: The recipient decodes the electronic signature using the sender’s public key once they have acquired the message and digital signature. This phase assures authenticity since only the sender holds the relevant private key necessary for encryption.
  5. Obtain the Original Message: After decryption, the receiver obtains the original message digest.
  6. Evaluate: The recipient computes the message digest from the received message and matches it to the decrypted message digest acquired from the digital signature. If both digests match, it ensures the integrity of the message, suggesting that it was not changed during transmission.

Who can use Digital Signature?

Individuals and organizations in various industries and sectors may benefit from using electronic signatures, such as:

  • Companies: Companies of various sizes, such as financial firms and healthcare organizations, may use it to sign contracts, agreements, and other legal documents safely and effectively.
  • Official Agencies: Government entities frequently require verification and authentication of official paperwork, forms, and electronic submissions. It preserves the integrity and confidentiality of sensitive information while making electronic document tracking and processing easier.
  • Individuals: Individuals who often conduct electronic transactions, such as online banking, can benefit from implementing it to protect their data and build confidence in their online interactions.

Where to Use Digital Signature?

You should use electronic signatures where data integrity, authentication, and non-repudiation are necessary. The following are some of the most common use cases:

  • Contract Signing: These signatures provide a safe way to sign contracts and eliminate the necessity of using physical documents while boosting remote cooperation.
  • Legal Documents: Legal professionals use electronic signatures to validate legal documents, ensuring their authenticity and integrity in court proceedings.
  • E-government Services: Government agencies utilize it to enable citizens to electronically sign and submit forms, applications, and other official documents securely.
  • Financial Transactions: It is vital in securing online financial transactions, including online banking, payment processing, and electronic fund transfers.

Apart from all these, you can use them for signing other documents, such as:

  • e-Tendering
  • MCA e-filing
  • e-Procurement
  • LLP registration
  • Customs e-filing
  • Loan applications
  • Income Tax e-filing
  • IE code registration
  • Patent and trademark e-filing
  • Real estate closing paperwork and contracts
  • Documents for virtual new hires and onboarding, etc.

Where to Buy Digital Signature?

Trusted Certificate Authorities (CAs) or authorized resellers can provide digital signatures. These organizations issue digital certificates that provide the information needed to generate and validate digital signatures. Some popular sources to buy e-signatures are:

  • Certified Vendors
  • Online Providers

Certified Vendors: Certified vendors collaborating with recognized Certificate Authorities provide digital signature solutions tailored to specific business needs.

Online Providers: Several reputable online providers offer e-signature services, allowing users to obtain and manage digital certificates directly through their platforms.

How to Generate Digital Signature?

Several companies and vendors provide handy options for generating digital signatures. Here are some of the top vendors that enable customers to generate these for free:

  1. DocuSign
  2. Signeasy
  3. PandaDoc
  4. SignNow
  5. Adobe Acrobat Sign, etc.

Features of Digital Signature

  • Enhanced Security: It uses cryptographic techniques to offer strong security, preventing unauthorized access or modifications to digital documents.
  • Authentication: It validates the sender’s identity, providing confidence that the document came from the claimed source.
  • Data Integrity: It ensures the integrity of digital material since any changes to the document after signing render the signature invalid.
  • Non-Repudiation: It provides non-repudiation, which means that the signer cannot deny signing the document, creating a legal trail of accountability.

Advantages of Digital Signature

  • Efficiency: It streamlines document signing processes, eliminating the need for physical paperwork and enabling swift electronic transactions.
  • Cost Savings: By eliminating paper-based processes and associated administrative tasks, it reduces costs related to printing, storage, and transportation.
  • Global Acceptance: Its international recognition and acceptance enable secure and legally binding transactions across the globe.
  • Hard to replicate or edit: It is challenging to replicate or edit them without detection, so imposters cannot tamper with digitally signed documents.

Disadvantages of Digital Signature

  • Key Management Complexity: Proper cryptographic keys and certificate management can be complex and require additional resources and expertise.
  • Dependency on Technology: It relies on technological infrastructure, including secure platforms and reliable digital certificate authorities, which can pose challenges in specific environments.
  • Software compatibility issues: One of the challenges encountered is ensuring compatibility of the software used. It is crucial to ensure that the software supports the digital signature technology being employed.
  • Interoperability challenges: Standardization is needed to ensure seamless interaction and compatibility between different systems, considering the availability of various methods and technologies for implementing them.
  • Cost Implications: To effectively utilize digital signatures, senders and recipients may need to purchase digital certificates and verification software, which can be costly.

What is a Digital Certificate?

A digital certificate is a document that cryptographically signs it. It functions as an electronic certificate for confirming the validity and integrity of digital data. Computer networks use it to offer secure communication channels and confirm the validity of parties participating in online transactions, such as browsers and servers.

A Digital Certificate comprises critical information about the entity it represents, such as its identification, public key, and the digital signature of a trustworthy Certificate Authority (CA). This information is securely bonded using encryption, guaranteeing that the certificate cannot be tampered with or falsified without discovery.

PKI systems rely heavily on digital certificates, often public key certificates. PKI’s fundamental purpose is to simplify distributing, authenticating, and revoking these certificates.

Who Requires a Digital Certificate?

These types of certificates are required by:

  • Web Browsers and Web Servers: A Digital certificate is essential for creating secure connections between web browsers and servers, guaranteeing that whatever is transferred stays unchanged and encrypted.
  • Public Key Encryption Systems: These play an essential role in exchanging public keys for encoding vulnerable data and validating digital signatures.
  • Online Services and E-Commerce Platforms: Websites and e-commerce platforms use these certificates to develop confidence with their users by confirming the reliability and legitimacy of their content.
  • Software Developers and Publishers: Software developers use active voice when they sign software code, including patches and updates, to confirm its authenticity and protect it from tampering or unauthorized alterations.
  • Public Key Infrastructure (PKI) systems: Organizations that maintain their PKI may issue public-key certificates internally, establishing trust within their network and ensuring secure communication.
  • IoT Device Manufacturers: As the Internet of Things continues to expand, organizations utilize these certificates to secure communication channels and safeguard sensitive data transmitted by IoT devices. This helps to mitigate information leakage and prevent hacking crises.
  • Government Agencies: Government agencies, financial institutions, and healthcare organizations often have regulatory requirements that mandate using public key certificates for secure communication.

Where can one utilize digital certificates?

Various industries and sectors make use of Digital Certificates (or SSL certificates) for encrypted transmission and identification purposes. Online banking, e-commerce platforms, secure email communication, document signing, server authentication, and VPN connections are some common examples of where digital certificates find wide application.

In addition to the aforementioned areas, digital certificates also find application in various other contexts and fields, such as:

  • Debit and Credit Card Dealings: Chip-embedded digital certificates provide encrypted and genuine connections between cards, traders, and banking institutions, assuring financial transaction integrity.
  • Online Payment Systems: Payment businesses use these certificates to authorize ATMs and POS devices, ensuring secure transactions with an administrative server.
  • Website Authentication: It plays a crucial role in website domain validation, showcasing their trustworthiness and authenticity to users.
  • Protection Against Broadband Service Theft: Manufacturers of computer components include public key certificates in cable modems to reduce the likelihood of broadband service thievery through a counterfeit device or cloning.

Where can Digital Certificates be Obtained From?

A Certificate Authority (CA) is a widely recognized and trusted organization issuing digital certificates. They play a crucial role in verifying the identities of certificate issuers and ensuring the legitimacy and integrity of the certificates they provide. With their reputation for reliability, CAs instill confidence in the digital certificate ecosystem and facilitate secure online communications.

You can also obtain these certificates from an authorized vendor that has partnered with a trusted CA, such as CheapSSLWeb. Here you can find the digital certificates at the lowest price possible.

How are Digital Certificates Generated?

The process of generating a Digital Certificate involves three simple steps:

  • Generate CSR (Certificate Signing Request).
  • Submit the CSR to a Certificate Authority for verification.
  • Upon successful verification, the CA will generate the digital certificate.

Note: The time and details needed may differ per the certificate chosen and the validation required. The generated certificate will include the applicant’s public key, identification information, and the digital signature of the CA.

Features of Digital Certificates

  • Identification: They let people, entities, or organizations authenticate their identities in the digital environment.
  • Authentication: Digital certificates certify the integrity and validity of digital assets to ensure that they have not been tampered with or forged.
  • Encryption: They enable the encryption of sensitive information, guarding it from unauthorized access.
  • Trustworthiness: A trusted CA (like Comodo, Sectigo, or Certera) issues digital certificates after thoroughly validating the certificate holder’s identity. This makes it difficult for malicious attackers to deceive users by impersonating a trusted entity.

Advantages of Digital Certificates

  • SHA 256-bit Encryption Strength: It offers a secure means for encrypting data by employing robust encryption algorithms, such as SHA 256-bit encryption strength, to limit the danger of unauthorized access.
  • Streamlined Compliance: It facilitates compliance with industry standards and regulatory requirements. Organizations can demonstrate adherence to security protocols by deploying certificates that comply with established guidelines and best practices.
  • Scalable: As it is highly scalable, organizations can quickly issue, withdraw, and renew these certificates in seconds, safeguarding user devices from security risks.

Disadvantages of Digital Certificates

  • Cost: Obtaining digital certificates from trusted Certificate Authorities may involve costs, especially for organizations requiring multiple certificates.
  • Technical Complexity: Implementing and administering digital certificates may be difficult, necessitating technical expertise and adherence to industry standards.
  • Revocation Issues: A revocation procedure must be launched when circumstances necessitate the removal of a certificate, such as a change in the certificate holder’s status. This procedure can be tedious and challenging.
  • Dependency on Certificate Authorities: The trustworthiness and reliability of digital certificates depend on the Certificate Authorities issuing them, which may introduce some reliance on these entities.
  • Performance: Sluggish performance can be noted while dealing with digital certificate authentication, encryption, and decryption, as these procedures take time to complete.
  • Integration: These certificates are not stand-alone technology. To be effective, they must be correctly integrated with the system, data, apps, hardware, etc…

How is Digital Signature Different From Digital Certificate?

BenchmarkDigital SignatureDigital Certificate
DefinitionIt is like a fingerprint that verifies the validity and integrity of an e-document.It is a file that verifies the bearer’s identity and offers security.
AuthenticatesOnline documentOwnership of an online medium.
FeaturesNon-repudiation, authentication, and integrity of an e-document.Authentication and security of online data transmission.
Working is based onDigital Signature Standard (DSS).Private and public keys and encryption securities.
UtilizesHashing function.Cryptographic keys
GenerationSHA-1 or SHA-2 algorithms are used to create it.X.509 standard format is used to create it.
PurposeNo alteration has been made to the document sent.Build and increase trust between the server and the client (browser).


To summarize, Digital Signatures and Certificates are essential to secure electronic communication. Digital Signatures secure the authenticity and integrity of documents, whereas Digital Certificates authenticate the entities participating in online transactions. Both have different characteristics, benefits, and drawbacks, but when utilized appropriately, they contribute to trust, data security, and efficient and secure electronic interactions across businesses and sectors.

Buy Email Signing or S/MIME Certificates at Cheapest Price
Janki Mehta

Janki Mehta

Janki Mehta is a Cyber-Security Enthusiast who constantly updates herself with new advancements in the Web/Cyber Security niche. Along with theoretical knowledge, she also implements her practical expertise in day-to-day tasks and helps others to protect themselves from threats.