Digital signature overview

 

Digital signature overview 

A digital signature is an electronic, encrypted stamp of authentication on digital information such as messages. The digital signature confirms the integrity of the message.
This signature ensures that the information originated from the signer and was not altered, which proves the identity of the organization that created the digital signature. Any change made to the signed data invalidates the whole signature.
The use of digital signatures is important because they can ensure end-to-end message integrity, and can also provide authentication information about the originator of a message. To be the most effective, the digital signature must be part of the application data so that it is generated at the time the message is created. Then, the signature is verified at the time the message is received and processed. You can choose to sign the entire message, or sign parts of the message (even overlapping parts of a message can be signed). You can choose to sign only parts of a message if a part of the message must be modified before it reaches the consumer. In this scenario, if the entire message was signed, the whole signature is invalidated if even one part of the message is modified. You can specify partial signatures for a message by specifying an ID attribute for every element that you want to sign and adding a reference.

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A digital signature for an electronic message is created by using a form of cryptography and is equivalent to a personal signature on a written document. The digital signature on a message provides a unique electronic binding of the identity of the signer to the origin of the message. A digital signature provides proof of the message origin and a method to verify the integrity of the message. A digital certificate owner combines the data to be signed with their private key, and then transforms the data with an algorithm. The recipient of the message uses the corresponding certificate public key to decrypt the signature. The public key decryption also verifies the integrity of the signed message and verifies the sender as the source. Only the organization with the private key can create the digital signature. However, anyone that has access to the corresponding public key can verify the digital signature.
The digital signature is based on the XML-signature syntax and processing specification that is defined for WS-Security. This specification defines an XML syntax for digital signatures (the processing rules for creating and verifying XML signatures). The SignedInfo element describes the signed content of the message. It also includes the syntax for representing the resulting signature information. The signature algorithm for signing the message is specified in the SignatureMethod element. The DigestMethod element specifies the digest algorithm that is applied to the signed message. The resulting digital signature value and digest value are encoded with base64 and are specified in the SignatureValue element and the DigestValue element.


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