Some of this data is seen in the message table, and some is not. Other tables of interest include message_location (contains GPS locations when location is shared or received), message_media (information about transferred files), message_thumbnail (contains thumbnails of transferred media stored as BLOBs), message_view (replay of the message table), and receipt_user (tracks when messages are received and read by other chat participants). The former will contain information about any group chats and the latter will contain information about contacts/chat participants. The other tables that are relevant for message content are chat (Figure 3) and jid (Figure 4). Regardless, most things examiners would be interested in are no longer contained in a single table. I suspect Meta simply de-duplicated the data. Information was scatterd among other tables in the older version, too, but it did make for some duplication of data as the same data was found in multiple tables. In the new version of msgstore.db the table message still contains message content (column text_data – seen in blue box Figure 2) but only references to those other mentioned data points, information about which are contained in other tables. In addition to message content and associated timestamps, it could also contain location data, information about transferred files, and data about other parties in a conversation. The messages table in the older version of msgstore.db could contain a lot of data depending on how WhatsApp was used. The column name has changed, too, from data to text_data. The interesting thing is that the version of msgstore.db from the public Android 12 image does have a table called message, but it contains no message content. Previous versions of WhatsApp stored message content in the table messages, but this new version is storing it in the table message (singular). msgstore.db from the public Android 12 image (WhatsApp version 2.21.20.20).Īs can be seen, the table name that holds message content (red boxes) has changed along with column name (blue boxes). Like previous versions of WhatsApp, message content is stored in the database msgstore.db, which is found in USERDATA/data/com.whatsapp/databases/, but that is where the similiarities stop. The biggest change, and arguably the most important, is how WhatsApp is storing message content. In order to get to this data an examiner’s extraction tool will need to have the ability to access the USERDATA/data/ directory path. WhatsApp version 2.22.11.82 was used and was the latest version as of the time of this post. WhatsApp is ubiquitous, so I will skip the background typically seen in my posts and, as they say in Monty Python, get on with it.įor testing, I used my new Pixel 5a, which was running Android 12 with the March 2022 security update. If you are interested in recent versions of WhatsApp on iOS, you will need to wait until August when Stacey Randolph and Chris Vance give their presentation at the 2022 SANS DFIR Summit. That is why it is important to understand the underlying data so that we not only can compensate for any changes in the data, but also know when a tool gives us an errant reading.Īs I tend to do when I see complaints about tools failing to do something with a previously supported app, I decided to take a look at WhatsApp on Android to see what changed. When this happens we are left on our own to figure out what has changed and to come up with new ways to get the data we are after. App developers will change something, and an examiner’s tools no longer function as they had previously. I started to notice a slight uptick in questions about WhatsApp, and a few folks on the Discord server noticed that some tools were no longer parsing messages or linking message attachments on more recent versions of the app on Android. However, just because I was taking a break does not mean I was not paying attention. So, don’t ever feel bad about taking some time away and letting your brain recharge. The good (and bad) thing about our discipline is that one can take a break whenever it’s needed and there will be plenty to do when the break is over. It was nice not having to carry more than one phone around, to put down the notepad & pen, and to just shutdown at the end of the day. I decided to take a month off from extracurricular DFIR activities after the Magnet User Summit.
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Tangent-flow boundary conditions at collocation points provide equations. Search the 1638 airfoils available in the databases filtering by name, thickness and camber. Collocation points are placed at mid-panel, just outside the airfoil. There are links to the original airfoil source and dat file and the details page with polar diagrams for a range of Reynolds numbers.Ĭlick on an airfoil image to display a larger preview picture. Continuity of circulation density between panels (except at trailing edge) provides equations, and a Kutta condition (zero circulation density at trailing edge) provides the final equation for a system of linear algebraic equations involving the unknown strength parameters. The system of equations is solved using the Mathematica function LinearSolve. This Demonstration uses dimensionless parameters, with the characteristic length of the problem being the chord of the airfoil and the characteristic speed being that of the uniform onset flow. von Doenhoff, Theory of Wing Sections, New York: Dover Publications, 1949. Plotkin, Low-Speed Aerodynamics, 2nd ed., Cambridge: Cambridge University Press, 2001. Free uiuc database download software at UpdateStar - SQL Server Compact 3. UIUC Applied Aerodynamics Group, UIUC Airfoil Data Site.How to do 2-D analysisFirst get your airfoil coordinates. dat file of the airfoil coordinatesThen go to File -> Direct Xfoil Analysis How to do 2-D analysisOpen XFLR5Go to File -> OpenThen open the.ĭat file using Wordpad and edit it according to the pictures dat file (UIUC Airfoil database)Then open up the. 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How to do 2-D analysisFor Re List under Batch Variables go to Edit ListHere we can edit the Reynolds number, Mach number, and Ncrit that we want. This Is What You Should GetIf the data is needed then pick the polar that you want and go to Polar -> Current Polar -> Export. Do a Range analysis*NOTE* Make sure that the range covers the range of the Reynolds numbers that your wing goes through (that includes the the Root Chord and the Tip Chord of your wing) How to do 3-D analysisAs you would with 2-D analysis, go do a Batch Analysis with the airfoil that you want. Furthermore, it enables the cruise performance and drag divergence Mach number to be predicted with only one simulation of the cruise point, which will greatly save the computational cost of optimizations.How to do 3-D analysisGo to File -> Wing Plane and DesignGo to Wing-Plane -> Design a New WingFrom here input the dimensions of your wing then hit Save and Close. It indicates that the drag divergence Mach number can be increased by obtaining a shock wave that is further upstream in the detailed design. Compared with Korn's equation, the discovered correlation reduces the maximum prediction error by approximately 40%. A new linear correlation is discovered and validated by existed airfoil databases. Correlation screening and multivariate regression are carried out to discover knowledge about the airfoil drag divergence Mach number and pressure distribution features. This paper designs a supercritical airfoil database that covers the typical free stream Mach number, angle of attack, lift coefficient, and geometry of modern transonic commercial aircraft. However, it neither reveals the key factors of fluid features on the drag divergence nor contributes to the detailed design. It is very helpful in the aircraft initial design. 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