How can you safely communicate with a friend?

Question

Android

Hello. How can you safely, without the risk that your letter may fall into the clutches of the FBI, communicate with a friend via OS ANDROID & LINUX (I use these OSes)? Through mail? I'm afraid that messengers can transmit information to the FBI. ̶K̶a̶k̶ ̶v̶y̶zh̶i̶t̶b̶ ̶v̶ ̶e̶t̶o̶m̶ ̶m̶i̶r̶e̶?̶

Answer 1

Well again...
Why.
There are technical means of ensuring the security of correspondence - for example, encryption using X.509, releasing them for themselves. Either stupidly making a letter in the text and encrypting it with RAR is a stupid and not convenient way, but the security will be no worse.
But it won't add security. Because if "people in gray" want to know what you are texting about, they will simply ask about it. In such a form that you can’t refuse :) You see, a person is the most vulnerable link in this system, and thermorectal cryptanalysis is still not outdated ...
Regarding messengers, I completely agree with Artem - no matter what the owner of the messenger says about the impossibility providing keys - he has such an opportunitythere is always Because it is his software and only he knows what he is doing there, and everyone else can only believe.
X.509 gives a sufficient level of protection for the "household level". You can’t protect yourself from the state in any way, unless you start a tractor - but there you can fall under local laws - which can turn out to be much more fraught ...

Answer 2

Use messenger Tox. Open source, no central server (because of this, you and your friend need to exchange keys first). There are clients for all platforms. Due to the lack of a server, there are no notifications, so start a conversation in another messenger or by phone by going to tox, or agree on a time, like Stirlitz :)

Answer 3

BitMessages - encrypted, anonymous, no meta information. Mail allows you to collect so-called meta information - which is not covered by the law on the secrecy of correspondence =)

Answer 4

PGP was invented for this purpose a million years ago.

Answer 5

I'm afraid that messengers can transmit information to the FBI.

Why such scrupulousness in a law-abiding citizen of a completely different country?

How can you safely, without the risk that your letter may fall into the clutches of the FBI, communicate with a friend via OS ANDROID & LINUX (I use these OSes)? Through mail?

No way. It's better to meet in person. It is not at all necessary to peruse and conduct a morphological or syntactic analysis of your correspondence with a friend. It is enough to fix where, when, from what device and to whom. Next, a social graph is built and included in the work of big data. Data from third-party services is pulled up by you and your friend - someone from this phone number with the id of the SIM card is registered in the social network, registered at the post office, etc. So, a digital dossier is collected in a roundabout way. Based on which you can predict your behavior. And it does not matter at all what you write to each other about.

Answer 6

If you do not trust anyone, including encryption algorithms, then you can use a one-time pad (absolutely strong cipher)

Answer 7

The bottom line is that restrictions are imposed by law on the complexity of encryption algorithms.
That is, you can encrypt your messages as you wish, but exactly as long as the corresponding services have the capacity to decrypt it.
Accordingly, you need to start bothering not only with privacy, but also with anonymity, so that they don’t know not only what you sent, but also that you sent it at all . Otherwise, everything that CityCat4 said about rectal cryptanalysis works.
Even if you did not send anything objectionable in your messages at all, the very fact of using overly complex encryption algorithms can serve as a reason for initiating a case.
PS Yes, you can probably jump off by saying that I don’t encrypt myself, but use third-party software, the complexity of its encryption algorithms is unknown to me and in general I don’t understand anything about it. Here, unfortunately, I don’t know exactly who exactly these restrictions apply to, only manufacturers of encryption software or users too.

Answer 8

Deploy your own chat server Mattermost , Rocket.Chat , or something similar.

Answer 9

And for some reason, no one mentioned steganography, which is at least a level higher than encryption.