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-rw-r--r--taler-exchange-manual.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/taler-exchange-manual.rst b/taler-exchange-manual.rst
index 2d476711..79a3bdf0 100644
--- a/taler-exchange-manual.rst
+++ b/taler-exchange-manual.rst
@@ -234,6 +234,9 @@ integration support.
Functionality
^^^^^^^^^^^^^
+The UNIX domain sockets have mode 0620 (u+rw, g+w). The exchange process
+MUST be in the same group as the the crypto helper processes.
+
The two helper processes will create the required private keys, and allow
anyone with access to the UNIX domain socket to sign arbitrary messages with
the keys or to inform them about a key being revoked. The helper processes