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Section 7 of the specification describes procedures for identification and encoding of public key materials and digital signatures . jarsigner verifies the digital signature of a JAR file , using the certificate that comes with it ( it is included in the signature block file of the JAR file ) , and then checks whether or not the public key of that certificate is " trusted " , i.e ., is contained in the specified keystore . Digital signatures have the required asymmetric property : the sender generates the signature with its private key , and all receivers can verify the signature with the sender 's public key , but a receiver with the public key alone cannot generate a digital signature for a new message . Extensions to the Domain Name System ( DNS ) are described that provide data integrity and authentication to security aware resolvers and applications through the use of cryptographic digital signatures . Contractors to the VA initiative say it is the first department to implement a program that complies with a recent presidential directive requiring agencies to use a single smart card with the best technology available , including digital signatures . Users of a public key shall be confident that the associated private key is owned by the correct remote subject ( person or system ) with which an encryption or digital signature mechanism will be used . Users of a public key require confidence that the associated private key is owned by the correct remote subject ( person or system ) with which an encryption or digital signature mechanism will be used . Security ( by way of digital signatures and sandboxing ) is a first class function , since plugins are intended to be installed and run across multiple sites without the users being expected to understand the details of the code or even trust the site from which the plugin was obtained . It then takes action appropriate for the command specified in the digital signature . Together with XML digital signatures , the Annotea project will provide a test-bed for ' Web-of-Trust ' Semantic Web applications .