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Home Features News People Service Donate List of Donors Download Integrity Check Supported Systems Release Notes Mirrors GIT Documentation HOWTOs Manuals Guides FAQs Mailing Lists Sites Bug Tracker Related software Frontends Tools Libraries All Blog Integrity Check Supported Systems Release Notes Mirrors GIT Note that you may also download the GNU Privacy Guard from a mirror site close to you. See our list of mirrors . The table below provides links to the location of the files on the primary server only. These are the canonical release forms of GnuPG. To use them you need to build the binary version from the provided source code. For Unix systems this is the standard way of installing software. For GNU/Linux distributions are commonly used (e.g. Debian, Fedora, RedHat, or Ubuntu) which may already come with a directly installa...

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The GNU Privacy Handbook Copyright © 1999 by The Free Software Foundation Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". Please direct questions, bug reports, or suggestions concerning this manual to the maintainer, Mike Ashley ( < jashley@acm.org > ). When referring to the manual please specify which version of the manual you have by using this version string: $Name: v1_1 $ . Contributors to this manual include Matthew Copeland, Joergen Grahn, and David A. Wheeler. J Horacio MG has translated the manual to Spanish. Table of Contents 1. Getting Started Generating a new ke...

The GNU Privacy Handbook Prev Chapter 2. Concepts Next Digital signatures A hash function is a many-to-one function that maps its input to a value in a finite set. Typically this set is a range of natural numbers. A simple hash function is f ( x ) = 0 for all integers x . A more interesting hash function is f ( x ) = x mod 37, which maps x to the remainder of dividing x by 37. A document's digital signature is the result of applying a hash function to the document. To be useful, however, the hash function needs to satisfy two important properties. First, it should be hard to find two documents that hash to the same value. Second, given a hash value it should be hard to recover the document that produced that value. Some public-key ciphers [1] could be used to sign documents. The signer encrypts the document with his private key. Anybody wishing to check the signature and see the docum...

The GNU Privacy Handbook Prev Chapter 1. Getting Started Next Making and verifying signatures A digital signature certifies and timestamps a document. If the document is subsequently modified in any way, a verification of the signature will fail. A digital signature can serve the same purpose as a hand-written signature with the additional benefit of being tamper-resistant. The GnuPG source distribution, for example, is signed so that users can verify that the source code has not been modified since it was packaged. Creating and verifying signatures uses the public/private keypair in an operation different from encryption and decryption. A signature is created using the private key of the signer. The signature is verified using the corresponding public key. For example, Alice would use her own private key to digitally sign her latest submission to the Journal of Inorganic Chemistry. The...