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A certificate-based signature,like a conventional handwritten signature, identifies the personsigning a document. Unlike a handwritten signature, a certificate-basedsignature is difficult to forge because it contains encrypted information thatis unique to the signer. It can be easily verified and informs recipients whetherthe document was modified after the signer initially signed the document.
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To sign a document with a certificate-based signature, you mustobtain a digital ID or create a self-signed digital ID in Acrobator Adobe Reader. The digital ID containsa private key and a certificate with a public key and more. Theprivate key is used to create the certificate-based signature. Thecertificate is a credential that is automatically applied to thesigned document. The signature is verified when recipients openthe document.
When you apply a certificate-based signature, Acrobat uses a hashing algorithm to generatea message digest, which it encrypts using your private key. Acrobatembeds the encrypted message digest in the PDF, certificate details, signatureimage, and a version of the document when it was signed.
The Sign > Work with Certificates panel lets you applytwo types of certificate-based signatures. You can certify a documentattest to its content or approve a document with the Sign With Certificateoption.
Certify options provide a higher level of document controlthan Sign With Certificate. For documents that require certification,you must certify the documents before others sign them. If a documenthas already been signed, the Certify options are disabled. Whenyou certify a document, you can control the types of changes otherpeople can make. You can certify with or without displaying a signature.
Signatures made with the Certify or Sign With Certificate optionscomply with data protection standards specified by the EuropeanTelecommunications Standards Institute (ETSI). In addition,both signature types comply with the PDF Advanced Electronic Signature(PAdES) standard. Acrobat and Reader provide an option to changethe default signing format to a CAdES format. This option is compliantwith Part 3 of the PAdES standard. The timestamp capability and nativesupport for long-term validation of signatures (introduced in Acrobat9.1) is in compliance with Part 4 of the PAdES standard. The defaultsigning format, when set up accordingly, is compliant with Part2 of the PAdES standard. You can change the default signing methodor format, in the Signatures panel of the Preferences dialog box.Under Creation & Appearance, click More.
Some situations require using particular digital IDs for signing. For example, a corporation or government agency can require individuals to use only digital IDs issued by that agency to sign official documents. Inquire about the digital signature policies of your organization to determine the appropriate source of your digital ID.
Seed values offer additionalcontrol to document authors by letting them specify which choicessigners can make when signing a document. By applying seed valuesto signature fields in unsigned PDFs, authors can customize optionsand automate tasks. They can also specify signature requirementsfor items such as certificates and timestamp servers. For more informationabout customizing signatures using seed values, see the Digital Signature Guide (PDF)at www.adobe.com/go/learn_acr_security_en.
You determine the look of your certificate-based signature by selecting options in the Signatures panel of the Preferences dialog box. For example, you can include an image of your handwritten signature, a company logo, or a photograph. You can also create different signatures for different purposes. For some, you can provide a greater level of detail.
Displays an image with your certificate-based signature. Selectthis option to include an image of your handwritten signature. Toimport the image file, click File, click Browse, and then selectthe image file.
A roaming ID isa digital ID that is stored on a server and can be accessed by the subscriber.You must have an Internet connection to access a roaming ID andan account from an organization that supplies roaming digital IDs.
You can have multiple digital IDs that you use for differentpurposes, particularly if you sign documents in different rolesor using different certification methods. Digital IDs areusually password protected. They can be stored on your computer inPKCS #12 file format. Digital IDs can alsobe stored on a smart card, hardware token, or in the Windows certificatestore. Roaming IDs can be stored on a server. Acrobat includes a default signaturehandler that can access digital IDs from various locations. Registerthe digital ID in Acrobat for it to be availablefor use.
You can include the dateand time you signed the document as part of your certificate-basedsignature. Timestamps are easier to verify when they are associatedwith a trusted timestamp authority certificate. A timestamp helpsto establish when you signed the document and reduces the chancesof an invalid signature. You can obtain a timestamp from a third-partytimestamp authority or the certificate authority that issued yourdigital ID.
Timestamps appear in the signature field and inthe Signature Properties dialog box. If atimestamp server is configured, the timestamp appears in the Date/Time tabof the Signature Properties dialog box. Ifno timestamp server is configured, the signatures field displaysthe local time of the computer at the moment of signing.
If you did not embed a timestamp when you signed the document, you can add one later to your signature. (See Establish long-term signature validation.) A timestamp applied after signing a document uses the time provided by the timestamp server.
Cloud signatures are remote digital signatures or seals where the digital certificate is stored in the cloud. Free from using a USB key or smartcard reader, cloud signatures allow signers and organizations to apply a digital signature on any device.
GlobalSign is the leading provider of trusted identity and security solutions enabling businesses, large enterprises, cloud service providers and IoT innovators around the world to secure online communications, manage millions of verified digital identities and automate authentication and encryption. Its high-scale Public Key Infrastructure (PKI) and identity solutions support the billions of services, devices, people and things comprising the Internet of Everything (IoE).
Use digital signing and sealing to replace wet ink signatures and create non-repudiable, legally binding documents. Digital signing allows agencies and organizations to streamline signature and approval processes, eliminate paper and establish an audit trail. This audit trail adds to the integrity of the digital signing process by providing documentary evidence of the sequence of signing activities that took place.
A digital signature can also be configured to incorporate an official digital seal to replace the traditional stamped or embossed seal that requires a wet ink signature. This functionality allows digital signing and sealing to be used by federal, state and local agencies as well as the engineers, architects, surveyors and others who transact with these agencies. Anyone with a need to digitally sign and seal plans and other documents can benefit from digital signing and sealing.
Digital signatures can also be used to sign email communications, reassuring the recipient that the sender is actually you. Digital signing of documents and email is the best way to ensure that the digital media remains intact, protecting the overall integrity of the document or email.
The Electronic Signatures in Global and National Commerce Act (ESIGN) enacted June 30, 2000 is a U.S. federal law that facilitates the use of electronic records and electronic signatures in interstate and foreign commerce by insuring the validity and legal effect of contracts entered into electronically. Former President Bill Clinton used an IdenTrust digital certificate to approve the ESIGN ACT.
IdenTrust as a Certification Authority (CA), issues Digital Certificates to digitally sign electronic documents. eNotary individuals can customize the appearance of the Digital Signature with their own Electronic Seal and/or facsimile of a wet signature, while keeping data integrity and non-repudiation of the signed document.
Many federal, state and local agencies now require digital signing and sealing on electronic plan and document submissions. IdenTrust issues certificates under the IdenTrust Global Common (IGC) program, a policy that is Federal Bridge Cross-Certified and proprietary to IdenTrust. Federal Bridge certified certificates are accepted government agencies and are ideal for digital signing and sealing documents that are required by these agencies.
When the certificate is issued in a hardware device (HID USB Token or HID Smart Card), it is automatically AATL enabled: The digital signature is instantly and automatically trusted, whenever the signed document is opened in an Adobe product.
Though often used interchangeably, the terms digital and electronic signatures are not the same. Digital signatures are a type of electronic signature based on cryptographic technology. This underlying cryptography makes them the most secure form of electronic signatures and able to comply with state signature requirements.
Digital Signatures apply the same functionality to an e-mail message or data file that a handwritten signature does for a paper-based document. The Digital Signature vouches for the origin and integrity of a message, document or other data file. 041b061a72