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pm:prj2026:theodor_ioan.buliga:catalin.manole1211 [2026/05/27 03:02] catalin.manole1211 |
pm:prj2026:theodor_ioan.buliga:catalin.manole1211 [2026/05/27 04:29] (current) catalin.manole1211 |
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| ===== Hardware Design ===== | ===== Hardware Design ===== | ||
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| - | Da, are sens sa trecem si bateriile separat ca piese distincte de suport, mai ales ca tipul lor (NiMH 1.2V) este important pentru logica de alimentare pe care ai explicat-o mai jos in pagina. Am pus 8 bucati in total (cate 4 pentru fiecare dintre cele 2 statii). | ||
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| - | Uite tabelul complet actualizat pentru wiki, gata de inlocuit: | ||
| | Component | Quantity | Description | Interface | | | Component | Quantity | Description | Interface | | ||
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| | ::: | SDA | D21 | I2C Data | Native hardware I2C pins for maximum compatibility with the Wire library. | | | ::: | SDA | D21 | I2C Data | Native hardware I2C pins for maximum compatibility with the Wire library. | | ||
| | ::: | SCL | D22 | I2C Clock | ::: | | | ::: | SCL | D22 | I2C Clock | ::: | | ||
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| ===== Software Design ===== | ===== Software Design ===== | ||
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| * **Long Press (> 5s):** If in ''ST_ADMIN'', it triggers `fingerprintDelete(USER_ID)` to wipe the database. | * **Long Press (> 5s):** If in ''ST_ADMIN'', it triggers `fingerprintDelete(USER_ID)` to wipe the database. | ||
| - | ==== Task Distribution (Dual-Core) ==== | + | ==== Hardware-Level Encryption (AES-128) ==== |
| - | To ensure "zero-latency" audio, the software is split between the two cores of the ESP32: | + | To prevent unauthorized interception of the radio traffic (packet sniffing), the system implements ESP-NOW's native **AES-128** encryption at the MAC layer. |
| - | * **Core 0 (Communication Task):** Handles the **ESP-NOW** stack, packet encryption (if implemented), and sending/receiving audio buffers. | + | * **Symmetric Keying:** A 16-byte secret key (''secretKey'') is hardcoded and shared between the ALPHA and BRAVO terminals. This acts as both the Primary Master Key (PMK) and the Local Master Key (LMK). |
| - | * **Core 1 (System Task):** Handles the Fingerprint UART polling, OLED I2C updates, and monitoring the GPIO buttons. | + | * **Secure Payload:** By setting ''peerInfo.encrypt = true'' during the peer registration phase, the ESP32's Wi-Fi hardware automatically encrypts the outgoing 240-byte audio payloads and decrypts them upon arrival. This zero-overhead hardware encryption ensures that the P2P voice stream remains strictly confidential. |
| ==== Communication Protocol & Audio Flow ==== | ==== Communication Protocol & Audio Flow ==== | ||
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| * **How:** The ''display.display()'' command was strictly restricted only to the moments when the device changes its state (e.g., transition from TX to RX). | * **How:** The ''display.display()'' command was strictly restricted only to the moments when the device changes its state (e.g., transition from TX to RX). | ||
| * **Why:** I2C is a much too slow bus compared to the frequency of the incoming radio packets (dozens per second). Updating the screen for every packet would have led to "CPU starvation", severely fragmenting the audio playback fluency. | * **Why:** I2C is a much too slow bus compared to the frequency of the incoming radio packets (dozens per second). Updating the screen for every packet would have led to "CPU starvation", severely fragmenting the audio playback fluency. | ||
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| - | * **Where:** Audio Feedback Loop (Sidetone Cancellation). | ||
| - | * **How:** The local playback of the microphone through its own speaker was completely suppressed in the code during transmission. | ||
| - | * **Why:** The physical proximity between the INMP441 and MAX98357A components inside the case instantly generated acoustic feedback (howling) and distortion. | ||
| * **Where:** Background Noise Management (I2S Speaker). | * **Where:** Background Noise Management (I2S Speaker). | ||
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| ===== Results ===== | ===== Results ===== | ||
| - | Link for DEMO: https://youtube.com/shorts/7HnLIHeZsL8?feature=share | + | Demo Link : https://youtube.com/shorts/ny9w-C_flPQ?is=Uj0ZvqpBS-vCuD1a |
| - | ===== Conclusions ===== | ||
| - | TBD | ||
| ===== Download ===== | ===== Download ===== | ||
| + | Project files can be found here: | ||
| + | https://github.com/Catalin951/Secure-Communication-Terminal/tree/main | ||
| - | <note warning> | ||
| - | O arhivă (sau mai multe dacă este cazul) cu fişierele obţinute în urma realizării proiectului: surse, scheme, etc. Un fişier README, un ChangeLog, un script de compilare şi copiere automată pe uC crează întotdeauna o impresie bună ;-). | ||
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| - | Fişierele se încarcă pe wiki folosind facilitatea **Add Images or other files**. Namespace-ul în care se încarcă fişierele este de tipul **:pm:prj20??:c?** sau **:pm:prj20??:c?:nume_student** (dacă este cazul). **Exemplu:** Dumitru Alin, 331CC -> **:pm:prj2009:cc:dumitru_alin**. | ||
| - | </note> | ||
| - | |||
| - | ===== Journal ===== | ||
| - | |||
| - | <note tip> | ||
| - | Puteți avea și o secțiune de jurnal în care să poată urmări asistentul de proiect progresul proiectului. | ||
| - | </note> | ||
| - | ===== Bibliography/Resources ===== | ||
| - | <html><a class="media mediafile mf_pdf" href="?do=export_pdf">Export to PDF</a></html> | ||
