SEB 2.1.4 uses the final implementation of the Config Key, to verify that an exam is using a correct, unmodified SEB configuration. The Config Key can be generated automatically by a compatible exam system together with the SEB config to be used for an exam. Safe Exam Browser is a customised web browser, available for Windows and Mac Operating Systems, that must be downloaded and installed on the computer that the student uses to attempt the quiz. The restrictions placed on students are similar to those in pop-up window case, but because Safe Exam Browser is software running on the student's computer, it can do a much more effective job.
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Safe Exam Browser for macOS 2.0 |
This is a preliminary document for a software version which is currently in development and does not yet contain all features of the final release. Anymp4 avchd converter 6 2 13. Therefore this information is not final and subject to change after new version updates are released.
This tutorial explains how to use individual encrypted configuration files introduced in Safe Exam Browser 2.0 to facilitate secure exams on managed and unmanaged computers like students' own laptops.
Safe Exam Browser Mac Os 10.13
Choose encryption
Create cryptographic identity
Configure and save .seb file
Deploy .seb file
Deploy identity
Start exam
Create cryptographic identity
Configure and save .seb file
Deploy .seb file
Deploy identity
Start exam
Choose encryption method
SEB 2.0 offers two possible encryption methods for the new .seb settings:
- Encryption with public key cryptography
In this scenario, a cryptographic identity (X.509 certificates with RSA public key and associated private key) installed in the keychain of the administrator and exam computers is used for encrypting and decrypting. This scenario makes most sense on managed computers. - Encryption with a password
The
From version 2.0 SEB uses encrypted .seb setting files which allow to individually configure SEB per exam.
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Create cryptographic identity
You can download the DMG disk image file here. If it doesn't get mounted, just double click on the downloaded file. Then you can drag the SEB application to the Application Folder or any other location on your computer. It is also possible to run SEB directly from the mounted disk image or from a network volume.
Create a certificate/identity in Keychain Access
Create a 'SSL Server' or 'S/MIME (Email)' certificate
![Browser for mac os Browser for mac os](https://image.slidesharecdn.com/eassessment-140606043646-phpapp02/95/faire-passer-des-examens-sur-moodle-un-retour-dexprience-18-638.jpg?cb=1402029688)
It's perfectly ok that the certificate is self-signed, just click 'Continue'
The successfully created certificate …
… needs to be exported ..
… in the format 'Personal Information Exchange (.p12)
Starting and Quitting SEB
When you start SEB, all currently running applications are hidden and all attached screens are covered with a black background. On the main screen SEB opens its web browser window filling the whole screen (the window can be resized and moved nevertheless). SEB opens the webpage at the preset Start URL, which might take some seconds. As default, as long as you don't set another Start URL (see Configuration), SEB MacOSX opens the project web site displaying this documentation. Also a window will be displayed about how to quit SEB and how to access preferences as long as you don't change some settings in preferences.
SEB doesn't have any navigation buttons, but if this has been enabled, you can use cmd+Cursor Left to go back in the browser history and cmd+Cursor Right to go forward in history. Cmd+R reloads the current page.
To quit SEB (while it's using the default settings), just press cmd+Q or the red close button in the browser window. Quitting SEB can be switched off or password protected in the Preferences window. When SEB quits, the applications which were visible before starting it will get unhidden again.
Configuration
SEB for Mac OS X has a comfortable preferences window build in which can be used for configuring SEB. After you start SEB, press the F3 and F6 keys (on modern Mac keyboards you also have to hold the fn key). After setting an administrator password, users have to enter this to display the preferences window. SEB MacOSX can also be configured not to display the preferences window at all, this makes sense on exam client computers.
In the preferences window you can set the following parameters:
Settings in General Pane
- Start URL: Full URL (starting with http:// or https://) of the page to open when SEB is started.
- Paste from saved clipboard: SEB saves the content of the clipboard (if it's a text string) when starting up and before clearing the clipboard. Use this link to paste the saved string to the Start URL field.
- Administrator password: Password required to enter the preferences window. It's recommended to set one!
- Confirm administrator password: Retype the administrator password. As long as it's not matching the administrator password typed in the field above, Passwords don't match is displayed below and you cannot save the preferences.
- Allow user to quit SEB: If selected, Users can quit SEB with cmd+Q. Otherwise you can shutdown or reset the computer or use the Quit button in this preferences window. In a computer room in a university or school you could for example use some tool to shutdown or reboot all computers after a exam and therefore not allow students to quit SEB themselves at all.
- Quit password: This password is prompted when users try to quit SEB with cmd+Q or the red close button in the browser window. If no quit password is set, then SEB just prompts Are you sure you want to quit SEB?
- Confirm quit password: Retype the quit password. As long as it's not matching the quit password typed in the field above, Passwords don't match is displayed below and you cannot save the preferences.
- About: Shows a window with copyright information and the version number of the SEB you're running. Click somewhere into the window to close it.
- Help-Button '?': Displays this manual page in the browser window. Preferences stay open, if they get hidden behind the browser window, you can access them by pressing the same keys like mentioned before.
You can get out of the preferences windows using one of the three buttons below:
- Close window (standard control in the windows title bar): Accepts preferences and closes window. If you changed start URL, SEB will be restarted to display the new page.
- Restart SEB: Saves preferences and restarts SEB, displaying the webpage at start URL.
- Quit: Saves preferences and exits SEB.
Settings in Browser Pane
- Links requesting to be opened in a new browser window .. This popup list offers three policies:
- get generally blocked
- open in same window: This was the behaviour in SEB MacOSX versions before 1.5.
- open in new window
- Block when directing to a different server: Hyperlinks which direct to a different host than the one of the current page will be ignored.
- Links in JavaScript/plug-ins .. This popup list offers three policies for hyperlinks opened from JavaScript or plug-ins (like Flash):
- get generally blocked
- open in same window: This was the behavior in SEB MacOSX versions before 1.5, but links got only opened, when they were not directing to a different server (see the checkbox below).
- open in new window
- Block when directing to a different server: Hyperlinks which direct to a different host than the one of the current page will be ignored. This can also filter unwanted cross-site content on a page, but redirections might also not work. Test this option carefully with your exam before using it!
- Enable plug-ins: Enables web plugins like Flash. For security reasons it's recommended to disable this option if you don't use any plugin content.
- Enable JavaScript: Please note that most modern websites need JavaScript for full functionality.
- Enable Java: Enables Java Applets. Starting SEB 2.0 this option is disabled by default because Java applets are considered a potential security risk.
- Block pop-up windows: Disables pop-up windows (often advertisement) opened by JavaScript without an user action such as a button click.
- Allow browsing back/forward: Disabling browsing to previously visited pages (by cmd + Cursor left) increases security, because it might be possible to leave an exam by browsing back to an external start page.
Settings in Exam Pane
- Exam Key: Copy this exam key string (which depends on your SEB configuration and the SEB version/application signature) to the according field in your quiz settings in the exam system having support for SEB 2.0 or later built in.
This feature in the exam preferences pane is not yet implemented in this version (see this discussion about how it will work). It should be available in SEB version 2.0pre2. - Copy Exam Key to clipboard when quitting SEB: SEB clears the clipboard when quitting, so you should either use SEB to copy the exam key to your quiz settings or this option to find the exam key in the clipboard after quitting SEB.
- Link to quit SEB after exam: Its possible to configure SEB to quit after the exam is submitted without having to enter a quit password by specifying a quit link (full URL starting with http:// or https://) and placing this on the summary page displayed by the LMS after submitting the exam.
- Use SEB settings file for .. starting an exam: A settings file saved with this option will start the exam with the according settings, but won't change the local SEB settings.
- Use SEB settings file for .. configuring a client: A SEB settings file saved with this option can be used to change the local settings of a SEB client. Encrypt it with the same password which is set as administrator password on the SEB client (or none if there is no administrator password set on the SEB client yet).
- Allow to open preferences window on client: Usually you should disable the preference window on exam clients besides for debugging purposes.
- Choose identity to be used for encrypting SEB settings file .. In this popup menu all identities (X.509 certificates with RSA public key and associated private key) in your default keychain are listed, which can be used for encrypting and decrypting. Export the chosen identity (in Keychain Access utility) and install it on your SEB clients.
- Settings password: Password to decrypt the settings file, if one is set then it will be prompted when SEB reads the settings.
- Confirm settings password: Retype the settings password.
- Save settings as.. Lets you choose a file name and location for the SEB settings file. You have to either enter a password or choose a cryptographic identity with which the SEB settings file will be encrypted. Use the saved encrypted settings file to either start the exam in SEB or to change the local settings of a SEB client, depending on the Use SEB settings file for .. option.
Settings in Advanced Pane
- Allow to switch to third party applications: If this option is activated, the kiosk mode induced by SEB will be reduced one level. The process switcher (cmd+Tab) will work, so it's possible to switch to other running applications.
Use this option only when running SEB in a user account managed by parental controls, with only SEB and the desired applications allowed. Also you should switch on Simple Finder and don't give users access to other accounts with administrator rights on that computer (see Secure Environment). The final version of SEB for macOS 2.0 will allow to use third party applications without a separate managed user account. - Allow Flash to switch to full screen mode: Playing videos with Flash in full screen mode is a security problem. That's why it is strongly recommended to use HTML5 video (there full screen mode is no problem) instead of Flash whenever possible. Depending on the Flash video player and the Mac used, it can be difficult to switch back from full screen mode (best is to use the esc key), so if you don't need full screen mode, don't enable it here.
When switching to third party applications is disabled, Flash fullscreen mode isn't possible at all.
- Allow downloading and uploading files: Usually to be used when switching to third party applications is enabled.
- Save downloaded files to: Choose the download directory in this Popup menu.
- Open files after downloading: Downloaded files will be opened with the according application, which has to be set correctly in the system for each used file type!
- Choose file to upload … SEB can let the user choose the file to upload manually (as usual) or automatically choose the same file which was downloaded before. There are three possible policies to choose the file to upload:
- manually with file requester
- by attempting to upload same file downloaded before: If the file is not found, a file requester is presented and the user can choose some other file manually.
- by only allowing to upload the same file downloaded before: If the file is not found, an error message is presented. This setting might bring additional security, because only files which have been downloaded before (in the same browser session, means since SEB was started) can be uploaded. If several files have been downloaded, pressing the choose file (or similarly named) button in the browser window will first choose the file most recently downloaded, pressing the button several times will cycle through all the files downloaded in this session.
- Download and open PDF files instead of displaying them inline: PDF files will not be displayed by SEB but downloaded and opened (if Open files after downloading is active!) by the application set in Finder (usually Preview or Adobe Acrobat). This option is useful when you allow to switch to third party applications and want to use some PDF forms which have to be filled out by the examinees/users.
Browser For Mac Os
SEB preferences are saved according to macOS standards in the user's Library/Preferences/ directory. The file named org.safeexambrowser.Safe-Exam-Browser.plist is generated after you start SEB the first time, open preferences and save them. In SEB version 2.0pre1 you can still deploy this file to the user's Library/Preferences/ directories on other computers (for example in a computer room in a university or school) to get them opening the same Start URL and using the same passwords. Even though the preferences file is encrypted, you should prevent examinees from replacing this file by not giving them administrator rights in macOS. For configuring SEB securely and individually for an exam, use the save SEB settings feature to create an encrypted .seb file, see Settings in Exam Pane.
Best Browser For Mac Os X
Operating System
OS X 10.7 and above on 64-bit Intel Macs
Secure Environment for Exams with SEB MacOSX
As mentioned, it is more secure to use SEB MacOSX in a managed environment, for using third party applications it's generally recommended in version 2.0pre1. When you create a separate user account with the settings described below, you can achieve a really secure environment.
- Create a Standard or Managed with Parental Controls user account (System Preferences -> Accounts). For running third party applications together with SEB, you have to use an account managed by parental controls.
- You can add SEB to Login Items in the Account Preferences, then SEB will be started automatically after the exam user logs in.
- In Login Options you should uncheck the checkbox in front of Show fast user switching menu as, at least when the examinees have access to other accounts on that computer.
- If you use an account with parental controls and third party applications, you can set (System Preferences -> Parental Controls) the option Simple Finder and Only allow selected applications with only SEB and the desired third party applications selected and in the Web tab Allow access to only these websites the URL to your LMS server.
- In System Preferences -> Sharing you should switch off everything, especially Screen Sharing, File Sharing, Remote Login, Remote Management and Internet Sharing. Or protect everything with proper passwords and don't give users administrator rights on that computer.
- Enable Open Firmware Password: The Open Firmware password is a security feature available on modern Macintosh systems. If you enable the Open Firmware password, the computer will execute a secure boot sequence. Specifically, enabling the Open Firmware password prevents users from starting up the computer from a volume other than the chosen as the startup disk (chosen in the Startup Disk preference panel within the System Preferences.) Also, enabling the Open Firmware Password prevents users from booting into single user mode using Command-S key combination at boot time. An administrator can enable the Open Firmware password using the Firmware Password Utility application that can be copied from the macOS software installation disc (located at /Applications/Utilities/ on the disc, not visible in Finder, use the Terminal).
The Open Firmware Password will be reset if a user changes the amount of the physical memory in the machine and reboots. Systems which require Open Firmware Password level security need to be protected from users gaining physical access to the internals of the computer.
License
Safe Exam Browser for macOS: © 2010-2013 Daniel R. Schneider, ETH Zurich, Educational Development and Technology (LET), based on the original idea of Safe Exam Browser by Stefan Schneider, University of Giessen
Project concept: Dr. Thomas Piendl, Daniel R. Schneider, Dr. Dirk Bauer, Karsten Burger, Marco Lehre, Brigitte Schmucki, Oliver Rahs. French localization: Nicolas Dunand
Project concept: Dr. Thomas Piendl, Daniel R. Schneider, Dr. Dirk Bauer, Karsten Burger, Marco Lehre, Brigitte Schmucki, Oliver Rahs. French localization: Nicolas Dunand
Source code:Released under the Mozilla Public License MPL 1.1
WebKit: BSD License Apple, LGPL2.0/2.1This project has been carried out as part of the program 'AAA/SWITCH – e-Infrastructure for e- Science” lead by SWITCH, the Swiss National Research and Education Network, and has been supported by funds from ETH Board.