There are several DECT cordless phones around me not only in my home, but also in my company.
All of them have a same brand.
Through the googling I found the fact that the DECT is very weak in security, so I decided to modify the firmware of my cordless phone first, then other phones too.
I have tried to see the phone's structure. The phone was mainly consisted in two parts: baseband chip (DE562xxxx) and RF transceiver (RF19Z).
But I don't know how can I program it, especially DE56 baseband chip.
I only want to modify (encrypt/decrypt) the voice data after compressed and/or before decompressed.
Who can help me? Please inform me how to do it, what is necessary. I'm familiar with ASM, C and C++.