Is encryption used in mobile and wired communications?

Question

Encryption

I don't understand where the truth is. I read somewhere that encryption is used in ordinary (home) phones, but it's expensive, but it seems that the law also prohibits it?
Mobile communication, as far as I know, does not encrypt anything - you need <<scramblers>> for encryption, or applications on smartphones.
In general, I'm somewhat lost, are there those who have reliable information?

Answer 1

There is no encryption in home telephony.
In mobile communications, both voice and data are encrypted on the operator's keys from the mobile phone to the base station (algorithms A5 / 1 and A5 / 2), then they are decrypted and go unencrypted in the operator's backbone channels (this is where SORM stands). Then, if the second subscriber is also on a mobile phone, the data is encrypted again, but with different keys.
What was written about above - end-to-end encryption (when the first subscriber encrypts and the second subscriber decrypts) - is possible using either smartphones (digital encryption) or voice scramblers (analog encryption), but worsens the quality of communication on unstable channels, requires the same algorithms for both subscribers, and in the case of digital encryption, it also introduces delays in the conversation (the voice is transmitted block by block in the GPRS stream).

Answer 2

Of course, there is no encryption in ordinary phones. In mobile communications, too, but I remember that I read on Habré about one phone model that has such a feature. Only in order for the channel to be truly secure, both phones on which communication takes place must be of this model (well, this is natural).

Answer 3

Not in ordinary ones, in fact, in cellular ones, too. To work safely, you need a Cryptophone (you can read briefly in magician-roman.livejournal.com/67260.html )

Answer 4

I read somewhere that ordinary (home) phones use encryption

I assume you read about DECT. There, as far as I know, some encryption is present.