Your deleted WhatsApp messages aren’t necessarily gone forever Picture GettyWhatsApp has made a number of changes to its messaging service over the past few months, including most recently, the ability to edit messages, up to 15 minutes after they have been sent. This can save you the embarrassment of making an unfortunate typo or of accidentally messaging the wrong person. WhatsApp users also now have the power to delete messages which can leave the recipient frustrated and dying to know what was in the deleted message. However, there are a number of simple tricks that iOS and Android users can use to uncover these messages – here’s how. Delete the iOS app iOS users can delete and redownload the WhatsApp app to recover deleted messages. Make sure your WhatsApp messages are backed up on iCloud Make sure your WhatsApp messages are backed up on iCloud Delete WhatsApp from your phone Redownload the app via the App Store Sign back in to your account A message will appear asking if you want previously backed up messages to be restored. If you select this option, all messages will be restored, including deleted ones. WhatsApp users can delete messages after sending them Picture WhatsAppView notification history on Android If you have Android 11 and above you can view messages deleted by the sender using the Notification History feature. Head to settings’ on your smartphone and select apps and notifications’. Find the notifications’ option and then select use notification history. You will then be shown a log of all notifications received by the device, which will include messages sent to you via WhatsApp which were then deleted by the sender. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Restore WhatsApp database on Android An alternative method for Android users is to restore WhatsApp messages through a database. Launch the file browser on your device. Head to the WhatsApp folder and click on database’ where all of the locally saved backup files for the app will be located. Hold down the file and then hit edit name’. Change its name to’msgstore to ensure that it is not overwritten. Then, change the most recent backup file’s name to’ Next, open Google Drive on your phone and choose the menu option with three vertical lines on the upper right hand side. Click on backups’ and erase your WhatsApp backup. Then, delete the WhatsApp app and install it again. You will be prompted to recover WhatsApp through a local backup. Choose the file and click Restore – this will restore all messages, even ones that have been deleted by the sender. MORE WhatsApp will now let you edit messages – but there’s a catch MORE WhatsApp’s Chat Lock feature is more than an upgrade for cheaters Follow Metro across our social channels, on Facebook, Twitter and Instagram Share your views in the comments below

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WhatsApp backup conversation files are now saved with the .crypt12 extension. From crypt9, they seem to be using a modified version of Spongy Castle – a cryptography API library for the findings below are based on reverse engineering work done on WhatCrypt and Omni-Crypt. I would like to highlight that IGLogger proved to be a very useful tool when it came to smali code debugging. Extract Key File To decrypt the crypt12 files, you will first need the key file. The key file stores the encryption key, K. WhatsApp stores the key file in a secure location /data/data/ If your phone is rooted, extracting this file is easy. I will not go through the steps again, as it’s already mentioned in the crypt8 decryption article. If your phone is not rooted, refer to instructions from WhatCrypt and Omni-Crypt for details on extracting the key file. The idea is to install an older version of WhatsApp, where Android ADB backup was still working and extract the key file from the backup. Extract crypt12 Backup File Pull the encrypted WhatsApp messages file from your phone using ADB. $ adb pull /sdcard/WhatsApp/Databases/ Decryption Keys This section is just for your information and you can skip this section. The encryption method being used is AES with a key K length of 256 bits and an initialisation vector IV size of 128 bits. The 256-bit AES key is saved from offset 0x7E till 0x9D in the file. Offsets start from 0x00. You can extract the AES key with hexdump and assign the value to variable $k. $ k=$hexdump -ve '2/1 "%02x"' key cut -b 253-316 The $k variable will hold a 64-digit hexadecimal value in ASCII that is actually 256 bits in length. The IV or the initialisation vector is saved from offset 0x33 till 0x42 in the crypt12 file. The IV value will be different for every crypt12 file. $ iv=$hexdump -n 67 -ve '2/1 "%02x"' cut -b 103-134 The K and IV extraction method is similar to what we have done for crypt8 files before. Strip Header / Footer in crypt12 File Again, this section is just for your information and you can skip this section. Before we start the decryption process, we will need to strip the 67 byte header and 20 byte footer from the crypt12 file. $ dd if= of= ibs=67 skip=1$ truncate -s -20 The above dd command will strip the the first 67 bytes from the crypt12 file and save it to a file with extension The truncate command will strip the last 20 bytes from the crypt12 file. As the WhatsApp AES cryptography API library seems to be a modified version, we will no longer be able to use openssl to decrypt the crypt12 file. I have yet to determine what has been modified. To decrypt crypt12 files, I have written a simple Java program that will use the modified cryptography API library instead. For the cryptography API library, I have extracted the modified Spongy Castle cryptography class files from the Omni-Crypt APK file using dex2jar. You can find the Java program and crypto library over here at GitLab. The Java program will create 3 output files – encrypted file with header and footer stripped. – decrypted file in zlib format. – decrypted sqlite3 database file. Below is how you can compile and run the Java program. 12345678910111213141516171819202122232425262728293031323334353637383940 $ git clone cd whatsapp-crypt12/$ javac -classpath "lib/ cp ../ .$ cp ../ .$ java -cp "lib/ crypt12KXXXXXXXXXXIVYYYYcreating encrypted file with header/footer stripped zlib output file sqlite3 output file ls -ltotal 136724-rw-r-r- 1 ibrahim staff 4339 Oct 9 1605 1 ibrahim staff 5459 Oct 9 1605 1 ibrahim staff 158 Oct 9 1605 keydrwxr-xr-x 2 ibrahim staff 4096 Oct 9 1605 lib-rw-r-r- 1 ibrahim staff 1089 Oct 9 1605 LICENSE-rw-r-r- 1 ibrahim staff 62692352 Oct 9 1606 1 ibrahim staff 25757610 Oct 9 1605 1 ibrahim staff 25757523 Oct 9 1605 1 ibrahim staff 25757507 Oct 9 1606 1 ibrahim staff 1376 Oct 9 1605 file * compiled Java class data, version Java C source, ASCII textkey Java serialization data, version 5lib SQLite database, user version raw G3 data, zlib compressed data Final Words To use the Java decryption tool, you will need to use OpenJDK. Oracle require JCE Provider libraries to be signed. OpenJDK does not have this requirement. If you try running the Java program on Oracle JDK, you will most likely get the following exception. Exception in thread "main" JCE cannot authenticate the provider SC There are some workarounds to bypass the error, but it has not worked for me so far. Decryption failed when using the modified cryptography API library from WhatsApp and WhatCrypt. Only Omni-Crypt library is working. I have yet to determine the reason for this. If you have any further information on this, leave a = { interested_inunix, linux, android, open_source, reverse_engineering; codingc, shell, php, python, java, javascript, nodejs, react; plays_onxbox, ps4; linux_desktop_usertrue; }

whatsapp database msgstore db crypt12