page for gcrypt

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diff --git a/doc/special_remotes.mdwn b/doc/special_remotes.mdwn
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--- a/doc/special_remotes.mdwn
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@@ -10,6 +10,7 @@ They cannot be used by other git commands though.
 * [[S3]] (Amazon S3, and other compatible services)
 * [[Amazon_Glacier|glacier]]
 * [[bup]]
+* [[gcrypt]] (encrypted git repositories!)
 * [[directory]]
 * [[rsync]]
 * [[webdav]]
diff --git a/doc/special_remotes/gcrypt.mdwn b/doc/special_remotes/gcrypt.mdwn
new file mode 100644
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@@ -0,0 +1,37 @@
+[git-remote-gcrypt](https://github.com/blake2-ppc/git-remote-gcrypt/)
+adds support for encrypted remotes to git. The git-annex gcrypt special
+remote allows git-annex to also store its files in such repositories.
+Naturally, git-annex encrypts the files it stores too, so everything
+stored on the remote is encrypted.
+
+## configuration
+
+These parameters can be passed to `git annex initremote` to configure
+gcrypt:
+
+* `encryption` - One of "none", "hybrid", "shared", or "pubkey".
+  See [[encryption]].
+
+* `keyid` - Specifies the gpg key to use for encryption of both the files
+  git-annex stores in the repository, as well as to encrypt the git
+  repository itself. May be repeated when multiple participants
+  should have access to the repository.
+
+* `gitrepo` - Required. The path or url to the git repository
+  for gcrypt to use. This repository should be either empty, or an existing
+  gcrypt repositry.
+
+## notes
+
+For git-annex to store files in a repository on a remote server, you need
+shell access, and `rsync` must be installed. 
+
+While you can use git-remote-gcrypt with servers like github, git-annex
+can't store files on them. In such a case, you can just use
+git-remote-gcrypt directly.
+
+If you use encryption=hybrid, you can add more gpg keys that can access
+the files git-annex stored in the gcrypt repository. However, due to the
+way git-remote-gcrypt encrypts the git repository, you will need to somehow
+force it to re-push everything again, so that the encrypted repository can
+be decrypted by the added keys.