OpenERP/Odoo is as secure as any other enterprise standard business application, and the architecture gives you many advantages to deploy applications over the Cloud infrastructure.
We have been getting many queries about "How secure is OpenERP/Odoo?" as it is a normal concern for the parallel kind of Open Source applications. Some vital information is being given here, but it will be highly appreciated if our valuable readers can further contribute to the information on this critical feature of OpenERP/Odoo.

OpenERP/Odoo provides

(1) web-predicated interface
(2) GTK-predicated interface

Security in OpenERP WEB-predicated Interface

(a) OpenERP web client uses https, protocol for transmitting data securely over the World Wide Web.
(b)OpenERP with vpn restricts any outsiders from accessing the system.
(c)Base_crypt module sanctions to store username and password in encrypted manner.
(d)Robot.txt file at the root of the web client folder not sanctions google to index the authentication screen.

Security in OpenERP GTK-predicated Interface

(a)OpenERP GTK client provides xmlrpc-secure, remote procedure call protocol amalgamated with security feature integrated recently to OpenERP
(b)OpenERP with LDAP module already present is another step towards security.

OpenERP-Server obviates from port predicated attacks on hosted server with its ability to transmute the port values with flexibility. OpenERP, mainly built in python, sanctions to incorporate any of the python secure features.