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There are 2 major variations that are often referred to as e-signatures. One is electronic signatures and the other is digital signatures.Electronic signatures are an "electronic sound, symbol, or process, attached to or logically associated with a contract or other record and executed or adopted by a person with the intent to sign the record.”. For example this can take the form of a check box on a web page. If the User checks the box then s/he has agreed/signed to what the form (maybe T&C) says.On the other hand, Digital signatures are typically based on cryptography (ex: public key cryptography and certificates). In digital signatures, a secret (private key in case of PKI) is generated and associated to an individual that is authorized to sign. This secret (private key) has to be protected very well else someone can impersonate you.One of the key challenges in digital signatures is protecting this per user (could be device too) secret carefully (ex: private key is often stored in a smart card or crypto USB token).Unlike vanilla electronic signatures, Digital signatures can give you non-repudiation but it is still very hard to win in a court of law for various technical reasons.Another challenge with e-signatures is ensuring the client application (example: browser or PDF reader) is trust-able. Due to malware and MITB attacks this is easier said than done.Type of Authentication of the signer is another challenge. If the authentication or enrollment (of the user identity) is weak then non-repudiation is even harder.Secure time-stamping of the event, revocation of signing credential, ability to add remarks, certificate issuance/management etc are also important.Approval work-flow, counter signing, multiple signatures, knowing what exactly is being signed are all important.Tamper proof auditing and reporting is also necessary.

Set your verification preferences in advance. This helps ensure that Digital Signatures are valid when you open a PDF and verification details appear with the signature. See Set signature verification preferences for details.When Digital Signatures are validated, an icon appears in the document message bar to indicate the signature status. Additional status details appear in the Signatures panel and in the Signature Properties dialog box.Setting up digital signature validationWhen you receive a signed document, you may want to validate its signature(s) to verify the signer and the signed content. Depending on how you have configured your application, validation may occur automatically. Signature validity is determined by checking the authenticity of the signature’s digital ID certificate status and document integrity:Authenticity verification confirms that the signer's certificate or its parent certificates exist in the validator’s list of trusted identities. It also confirms whether the signing certificate is valid based on the user's Acrobat or Reader configuration.Document integrity verification confirms whether the signed content changed after it was signed. If content changes, document integrity verification confirms whether the content changed in a manner permitted by the signer.Set signature verification preferencesOpen the Preferences dialog box.Under Categories, select Signatures.For Verification, click More.To automatically validate all signatures in a PDF when you open the document, select Verify Signatures When The Document Is Opened. This option is selected by default.Select verification options as needed and click OK.Verification BehaviorWhen VerifyingThese options specify methods that determine which plug-in to choose when verifying a signature. The appropriate plug-in is often selected automatically. Contact your system administrator about specific plug-in requirements for validating signatures.Require Certificate Revocation Checking To Succeed Whenever Possible ...Checks certificates against a list of excluded certificates during validation. This option is selected by default. If you deselect this option, the revocation status for approval signatures is ignored. The revocation status is always checked for certifying signatures.Verification TimeVerify Signatures UsingSelect an option to specify how to check the digital signature for validity. By default, you can check the time based on when the signature was created. Alternatively, check based on the current time or the time set by a timestamp server when the document was signed.Use Expired TimestampsUses the secure time provided by the timestamp or embedded in the signature, even if the signature’s certificate has expired. This option is selected by default. Deselecting this option allows discarding of expired timestamps.Verification InformationSpecifies whether to add verification information to the signed PDF. Default is to alert user when verification information is too large.Windows Integrationspecify whether to trust all root certificates in the Windows Certificates feature when validating signatures and certified documents. Selecting these options can compromise security.

SPITrust is a product of RNTrust, it is a Digital Signature/eSignNon-Repudiation Digital Signature/eSign and Proof Infrastructure in the Paperless worldDigital Signatures/eSign are as secure as the business processes and technology used to create them.SPITrust product suite targets all organizations seeking to secure their paperless transactions. It provides an industrialized infrastructure with web-based platform for rapidly implementing and integrating electronic / digital signatures into business processes and managing legally recognized elements of proof.SPITrust is a suite of highly secure “off the shelf” products that provide all functionality necessary to:create and validate digital signatures/eSigngenerate legally recognized elements of proofSign and Verify PDF documentsTimestamp PDF documentsMultiple Signer workflow​KEY FEATURESX.509 v3 Digital SignaturesPDF Signature format (ISO 32000-1, PAdES Basic/Enhanced/Long Term)Generating signed timestamps with RFC 3161 TSP Specification.Multiple Signer ProfilesConfidentiality, Integrity and AuthenticitySign by individual or groupLong Term ValidationProof Elements for legal purposeStandard built-in connectors for other trusted servicesCertification AuthoritiesTime Stamping AuthoritiesHSM Signing KeyActive Directory / LDAPSMS GatewayT-OTPAudit TrailsKEY BENEFITSEasy and User-friendlyReduced Processing TimeReduced Operational CostUse anywhere, anytime and on any device.Streamline document-signing process.Paperless OperationsSPITrust perfectly comply with organizations GOAL of paperless operations by performing digital signatures/eSign on the PDF documents within the frameworks of organizations systems and procedures.Assurance levelIt provides confidentiality, integrity and authenticity:Confidentiality – Digital Signature/eSign creation data is used under a control environment.Integrity – the document is/was not manipulated after the digital signing process.Authenticity – the document is signed by the claimed identityUniquely connected to the signatoryCapable of identifying the signatoryIt is secure and trustedStandardsDigital certificate: X509 v3 (revocation by CRL or OCSP)Signature format: XAdES, PDF (ISO 32000-1, PAdES Basic/Enhanced/Long Term), PKCS#7/CMS, RFC3161 TSP SpecificationsHash algorithms: SHA1, SHA-256, and SHA-512Signature algorithm: RSAKey length: 1024 - 4096 bytesLegally RecognizedDocuments like memos, contracts, purchase orders, etc. are legal instruments for organizations, SPITrust provides legally recognized element of proof which legally binds the documents and admissible as evidence in the court of law. The legality of electronic/digital signatures are governed based on jurisdiction.UAE Law: Federal Law No.1 of 2006US SEAL (1998), UETA (1999), ESIGN (2001)European Directive 1999/93/CE, December 1999German Act on Digital Signature 2001, Signature Ordonnance 2001Croatia (Act on Digital Signature, NN 10/02, 80/08, 30/14)French Loi n° 2000-230 Mars 2000, Décret n°2001-272 Mars 2001Signer ProfileServer seal – This means that the certificate is issued in the name of a legal entity and not in the name of an end-user / individual. Using PKCS#12 or HSM Signing KeyOn-the-fly certificates – end user signature with on-the-fly certificate following X.509 standard. Using OpenTrust PKI /ReTrust.Me-PKISign by Individual or groupSelf-Sign – Signer upload and SignInitiator-Signer – Initiator upload and request Signer to Sign.Initiator-Group (n of n) – Initiator upload and request all the members of the group to sign.Initiator-Group (1 of n) – Initiator uploads and request one member of the group to sign.Built-in ConnectorsStandard built-in connectors for automated exchanges with other trusted third-party services such as…Certification Authorities – Vendor IndependentTime Stamping Authorities – Internal or ExternalHSM for Signing Keys – nCipher nShield, Thales Luna, Utimaco CryptoServerSMS Gateway – Vendor IndependentTime based OTP – Google Authenticator (default)RNTrust (SPITrust) use digital certificates and PKI (Public Key Infrastructure) to help your global business meet region-specific requirements, such as those found in the European Union, as well as the requirements of regulated industries around the world, including Financial, Aviation, Healthcare, Government, and Energy and Utilities.Digital Signature/eSign - Success StoriesKIBSTrust SignPlus - Digitally transform your business with SignPlus eSignature solutions.