Signature file

Signature files are computer files of some kind of signature data, such as:


 * A file containing signature values to be used in signature-based detection of viruses
 * In document retrieval, a quick and dirty filter that keeps all the documents that match to the query.
 * A signature block, or sig file is a block of text automatically appended at the bottom of an email message.
 * A file containing a digital signature
 * Electronic signature