Windows For Windows installers please go to. For new users we recommend the standalone installers. For more advanced QGIS users you can use OSGeo4W packages, which make it possible to install several versions in parallel. The OSGeo4W repository contains a lot of software from OSGeo projects. QGIS and all dependencies are included, along with Python, GRASS, GDAL, etc.

The installer is able to install from internet or just download all needed packages beforehand. The downloaded files are kept in a local directory for future installations. Debian/Ubuntu Default Debian and Ubuntu software repositories often hold older versions of QGIS. To have newer versions, you have to add alternative software repositories, by adding one of the deb-lines below to your /etc/apt/sources.list file.

Everything you need to get started with secure communication and encrypting files in one simple package leveraging the power of OpenPGP/GPG.

Our main repository contains multiple lines of packages for several versions of Debian and Ubuntu based on the dependencies the individual distributions provide. For Ubuntu we also have extra packages in a separate repository that are based on ubuntugis (), which holds more uptodate versions of other GIS packages than Ubuntu itself. If you want those you also need to include ubuntugis ppa in your /etc/apt/sources.list file. Note The packages are only produced once shortly after a new version has been released. As unstable, not yet released debian versions (testing) and ubuntugis can have library changes the packages might sooner or later be broken, when the development in debian, ubuntu or ubuntugis moves on and their packages used as dependencies in qgis change. In that event you can either • move to a stable debian version and use the released packages for it, • wait for the next point release (due 2018-01-19 12:00:00 UTC), which happens every month and will include the updated dependencies, • switch to the nightly repository whose packages are rebuild on regular basis and will also pickup the updated dependencies automatically or • build your own set of packages (see ). (more dates see Release Schedule on ) Supported distribution versions: Distribution Version Codename Also available based on ubuntugis dependencies?

Qubes Split GPG What is Split GPG and why should I use it instead of the standard GPG? Split GPG implements a concept similar to having a smart card with your private GPG keys, except that the role of the “smart card” plays another Qubes AppVM. This way one, not-so-trusted domain, e.g.

The one where Thunderbird is running, can delegate all crypto operations, such as encryption/decryption and signing to another, more trusted, network-isolated, domain. This way the compromise of your domain where Thunderbird or another client app is running – arguably a not-so-unthinkable scenario – does not allow the attacker to automatically also steal all your keys. (We should make a rather obvious comment here that the so-often-used passphrases on private keys are pretty meaningless because the attacker can easily set up a simple backdoor which would wait until the user enters the passphrase and steal the key then.) The diagram below presents the big picture of Split GPG architecture. Advantages of Split GPG vs. Traditional GPG with a smart card It is often thought that the use of smart cards for private key storage guarantees ultimate safety.

While this might be true (unless the attacker can find a usually-very-expensive-and-requiring-physical-presence way to extract the key from the smart card) but only with regards to the safety of the private key itself. However, there is usually nothing that could stop the attacker from requesting the smart card to perform decryption of all the user documents the attacker has found or need to decrypt.

In other words, while protecting the user’s private key is an important task, we should not forget that ultimately it is the user data that are to be protected and that the smart card chip has no way of knowing the requests to decrypt documents are now coming from the attacker’s script and not from the user sitting in front of the monitor. (Similarly the smart card doesn’t make the process of digitally signing a document or a transaction in any way more secure – the user cannot know what the chip is really signing. Unfortunately this problem of signing reliability is not solvable by Split GPG) With Qubes Split GPG this problem is drastically minimized, because each time the key is to be used the user is asked for consent (with a definable time out, 5 minutes by default), plus is always notified each time the key is used via a tray notification from the domain where GPG backend is running.

This way it would be easy to spot unexpected requests to decrypt documents. Current limitations • Current implementation requires importing of public keys to the vault domain. This opens up an avenue to attack the gpg running in the backend domain via a hypothetical bug in public key importing code. See ticket for more details and plans how to get around this problem, as well as the section on below.

• It doesn’t solve the problem of allowing the user to know what is to be signed before the operation gets approved. Perhaps the GPG backend domain could start a Disposable VM and have the to-be-signed document displayed there? To Be Determined. Configuring Split GPG In dom0, make sure the qubes-gpg-split-dom0 package is installed. [user@work-gpg ~]$ gpg -K /home/user/.gnupg/secring.gpg ----------------------------- sec 4096R/3F48CB21 2012-11-15 uid Qubes OS Security Team ssb 4096R/30498E2A 2012-11-15 (.) This is pretty much all that is required. However one might also want to modify the default timeout which tells the backend for how long the user’s approval for key access should be valid (default 5 minutes).

This is adjustable via QUBES_GPG_AUTOACCEPT variable. One can override it e.g. In ~/.bash_profile. [user@work ~]$ export QUBES_GPG_DOMAIN=work-gpg [user@work ~]$ gpg -K [user@work ~]$ qubes-gpg-client -K /home/user/.gnupg/secring.gpg ----------------------------- sec 4096R/3F48CB21 2012-11-15 uid Qubes OS Security Team ssb 4096R/30498E2A 2012-11-15 (.) [user@work ~]$ qubes-gpg-client secret_message.txt.asc (.) Note that running normal gpg -K in the demo above shows no private keys stored in this AppVM. A note on gpg and gpg2: Throughout this guide, we refer to gpg, but note that Split-GPG uses gpg2 under the hood for compatibility with programs like Enigmail (which now supports only gpg2). If you encounter trouble while trying to set up Split-GPG, make sure you’re using gpg2 for your configuration and testing, since keyring data may differ between the two installations.

Using Thunderbird + Enigmail with Split GPG However, when using Thunderbird with Enigmail extension it is not enough, because Thunderbird doesn’t preserve the environment variables. Instead it is recommended to use a simple script provided by /usr/bin/qubes-gpg-client-wrapper file by pointing Enigmail to use this script instead of the standard GnuPG binary: The script also sets the QUBES_GPG_DOMAIN variable automatically based on the content of the file /rw/config/gpg-split-domain, which should be set to the name of the GPG backend VM. This file survives the AppVM reboot, of course. [user@work ~]$ sudo bash [root@work ~]$ echo 'work-gpg' >/rw/config/gpg-split-domain A note on passphrases: You may experience trouble when attempting to use a PGP key with a passphrase along with Split-GPG and Enigmail. If you do, you may need to remove the passphrase from your (sub)key(s) in order to get Split-GPG working correctly. As mentioned above, we do not believe PGP key passphrases to be significant from a security perspective. Using Git with Split GPG Git can be configured to used with Split-GPG, something useful if you would like to contribute to the Qubes OS Project as every commit is required to be signed.

The most basic ~/.gitconfig file to with working Split-GPG looks something like this. [user@work ~]$ export QUBES_GPG_DOMAIN=work-gpg [user@work ~]$ qubes-gpg-import-key ~/Downloads/marmarek.asc Advanced: Using Split GPG with Subkeys Users with particularly high security requirements may wish to use Split GPG with. However, this setup comes at a significant cost: It will be impossible to sign other people’s keys with the master secret key without breaking this security model. Nonetheless, if signing others’ keys is not required, then Split GPG with subkeys offers unparalleled security for one’s master secret key. Setup Description In this example, the following keys are stored in the following locations (see below for defintions of these terms): PGP Key(s) VM Name sec vault ssb work-gpg pub work-email • sec (master secret key) Depending on your needs, you may wish to create this as a certify-only (C) key, i.e., a key which is capable only of signing ( Installer Thermostat Sans Fil Chaudiere Fioul. a.k.a., “certifying”) other keys.

This key may be created without an expiration date. This is for two reasons. First, the master secret key is never to leave the vault VM, so it is extremely unlikely ever to be obtained by an adversary (see below). Second, an adversary who does manage to obtain the master secret key either possesses the passphrase to unlock the key (if one is used) or does not. An adversary who does possess the passphrase can simply use it to legally extend the expiration date of the key (or remove it entirely). An adversary who does not possess the passphrase cannot use the key at all.

In either case, an expiration date provides no additional benefit. By the same token, however, having a passphrase on the key is of little value. An adversary who is capable of stealing the key from your vault would almost certainly also be capable of stealing the passphrase as you enter it. An adversary who obtains the passphrase can then use it in order to change or remove the passphrase from the key. Therefore, using a passphrase at all should be considered optional. It is, however, recommended that a revocation certificate be created and safely stored in multiple locations so that the master keypair can be revoked in the (exceedingly unlikely) event that it is ever compromised. • ssb (secret subkey) Depending on your needs, you may wish to create two different subkeys: one for signing (S) and one for encryption (E).

You may also wish to give these subkeys reasonable expiration dates (e.g., one year). Once these keys expire, it is up to you whether to renew these keys by extending the expiration dates or to create new subkeys when the existing set expires.

On the one hand, an adversary who obtains any existing encryption subkey (for example) will be able to use it in order to decrypt all emails (for example) which were encrypted to that subkey. If the same subkey were to continue to be used–and its expiration date continually extended–only that one key would need to be stolen (e.g., as a result of the work-gpg VM being compromised; see below) in order to decrypt all of the user’s emails. If, on the other hand, each encryption subkey is used for at most approximately one year, then an adversary who obtains the secret subkey will be capable of decrypting at most approximately one year’s worth of emails.

On the other hand, creating a new signing subkey each year without renewing (i.e., extending the expiration dates of) existing signing subkeys would mean that all of your old signatures would eventually read as “EXPIRED” whenever someone attempts to verify them. This can be problematic, since there is no consensus on how expired signatures should be handled. Generally, digital signatures are intended to last forever, so this is a strong reason against regularly retiring one’s signing subkeys. • pub (public key) This is the complement of the master secret key.

It can be uploaded to keyservers (or otherwise publicly distributed) and may be signed by others. • vault This is a network-isolated VM. The initial master keypair and subkeys are generated in this VM. The master secret key never leaves this VM under any circumstances. No files or text is ever or into this VM under any circumstances. • work-gpg This is a network-isolated VM. This VM is used only as the GPG backend for work-email.

The secret subkeys (but not the master secret key) are from the vault VM to this VM. Files from less trusted VMs are never into this VM under any circumstances. • work-email This VM has access to the mail server. It accesses the work-gpg VM via the Split GPG protocol. The public key may be stored in this VM so that it can be attached to emails and for other such purposes. Security Benefits In the standard Split GPG setup, there are at least two ways in which the work-gpg VM might be compromised.

First, an attacker who is capable of exploiting a hypothetical bug in work-email’s could gain control of the work-email VM and send a malformed request which exploits a hypothetical bug in the GPG backend (running in the work-gpg VM), giving the attacker control of the work-gpg VM. Second, a malicious public key file which is imported into the work-gpg VM might exploit a hypothetical bug in the GPG backend which is running there, again giving the attacker control of the work-gpg VM. In either case, such an attacker might then be able to leak both the master secret key and its passphrase (if any is used, it would regularly be input in the work-gpg VM and therefore easily obtained by an attacker who controls this VM) back to the work-email VM or to another VM (e.g., the netvm, which is always untrusted by default) via the Split GPG protocol or other. Once the master secret key is in the work-email VM, the attacker could simply email it to himself (or to the world).

In the alternative setup described in this section (i.e., the subkey setup), even an attacker who manages to gain access to the work-gpg VM will not be able to obtain the user’s master secret key since it is simply not there. Rather, the master secret key remains in the vault VM, which is extremely unlikely to be compromised, since nothing is ever copied or transferred into it.

* The attacker might nonetheless be able to leak the secret subkeys from the work-gpg VM in the manner described above, but even if this is successful, the secure master secret key can simply be used to revoke the compromised subkeys and to issue new subkeys in their place. (This is significantly less devastating than having to create a new master keypair.) *In order to gain access to the vault VM, the attacker would require the use of, e.g. Deitel C++ How To Program 9th Edition Pdf Free Download here. , a general Xen VM escape exploit or a upon which the vault VM is based.

Subkey Tutorials and Discussions (Note: Although the tutorials below were not written with Qubes Split GPG in mind, they can be adapted with a few commonsense adjustments. As always, exercise caution and use your good judgment.) • • • •.