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ac:laboratoare:08 [2024/11/14 11:27] dimitrie.valu |
ac:laboratoare:08 [2024/11/14 13:05] (current) dimitrie.valu |
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| ===== Lab 08 - Whatsapp End-to-end Encryption (part 2) ===== | ===== Lab 08 - Whatsapp End-to-end Encryption (part 2) ===== | ||
| - | In this lab you will continue the implementation of the Signal protocol, which is the basis for WhatsApp's end-to-end encryption. | + | In this lab you will continue the implementation of the Signal Protocol, which is the basis for WhatsApp's end-to-end encryption. |
| The protocol is described [[https://cryptome.org/2016/04/whatsapp-crypto.pdf|here]]. | The protocol is described [[https://cryptome.org/2016/04/whatsapp-crypto.pdf|here]]. | ||
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| For the Elliptic Curves, you can use [[https://github.com/Muterra/donna25519|this]] library. | For the Elliptic Curves, you can use [[https://github.com/Muterra/donna25519|this]] library. | ||
| - | For installation, follow these steps: | + | If you solved the previous lab, use your previous setup (replace the files with the ones from the ''%%.zip%%'' below to prevent any issues). If you are starting out with these labs, follow the steps below (NOTE: **you can use your ''%%fep%%'' instance via Python3 environments**): |
| - | * Log-in as admin (need admin user/password from lab host) | + | * Install the necessary tools (not necessary on ''%%fep%%''): |
| - | * Select Administration->Software Sources and then select the romanian repos for high bandwidth | + | <code> |
| - | * Install the necessary tools: sudo apt-get install build-essential setuptools python-dev | + | sudo apt install build-essential python3-dev |
| - | * Install pip: sudo apt-get install pip | + | sudo apt install python3-pip |
| - | * Install donna via pip: sudo pip install donna25519 | + | </code> |
| - | * Log-out from admin account | + | * Use ''%%wget%%'' to download the required zip (find it below) |
| - | * Log-in with student as usual | + | * Create a Python3 environment, make sure PyPI is up to date and install the required packages: |
| + | <code> | ||
| + | python3 -m venv create env | ||
| + | source ./env/bin/activate | ||
| + | pip install --upgrade pip | ||
| + | pip install cryptography donna25519 | ||
| + | </code> | ||
| + | **If local installation does not work, use your ''%%fep%%'' instance.** | ||
| - | === Task 1 (Vertical & Horizontal ratcheting) === | ||
| - | See the previous lab for how to create a common master_secret for two clients which communicate through a server. | + | === Task - Vertical & Horizontal ratcheting === |
| + | |||
| + | See the previous lab for how to create a common ''%%master_secret%%'' for two clients which communicate through a server. | ||
| Then, send messages with different keys each time, by recalculating the Chain Key according to the Signal Protocol. | Then, send messages with different keys each time, by recalculating the Chain Key according to the Signal Protocol. | ||
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| while chain_key_r can be left as 'None' for now. | while chain_key_r can be left as 'None' for now. | ||
| </note> | </note> | ||
| + | |||
| + | == How to run == | ||
| + | Open three different terminals. | ||
| + | |||
| + | First terminal (start the server): | ||
| + | <code>python main_server.py</code> | ||
| + | |||
| + | Second terminal (start the first client and enter ''%%RECV%%'' mode: | ||
| + | <code> | ||
| + | python main_client.py | ||
| + | RECV | ||
| + | </code> | ||
| + | |||
| + | Third terminal (start the second client and send a message): | ||
| + | <code> | ||
| + | python main_client.py | ||
| + | MSG <id_other_client> Hello! | ||
| + | </code> | ||
