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[eckmar]

I had an idea about my device: offer plans to build it yourself. Buy your components, and build it. Reading about Anom today makes me upset that simple multiplication on a device could have prevented all this. Seeing also that so much money is put into security... I don't understand why nobody has built such thing yet.
My device has the convenience to work immediately with no previous data/key shared between the protagonists, with an en/decryption key by key (you can chat live and decrypt any word real time). But a scheme with shared data/key and the whole message encrypted and  then decrypted is much simpler to realize and as safe (just less cool)

How do you plan to accomplish that without key exchange? One of the most important elements of secure communication is key exchange, there are even algorithms developed to do just that. If you are not going to do that, then you must set a pre shared key when you ship this so called device. Even if you don't do that, and want users to generate keys themselves, what are you going to do then? How are you going to input the public key of other party into the device securely? (Assuming you are talking about asymmetric encryption)

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[eckmar]

I had an idea about my device: offer plans to build it yourself. Buy your components, and build it. Reading about Anom today makes me upset that simple multiplication on a device could have prevented all this. Seeing also that so much money is put into security... I don't understand why nobody has built such thing yet.
My device has the convenience to work immediately with no previous data/key shared between the protagonists, with an en/decryption key by key (you can chat live and decrypt any word real time). But a scheme with shared data/key and the whole message encrypted and  then decrypted is much simpler to realize and as safe (just less cool)

How do you plan to accomplish that without key exchange? One of the most important elements of secure communication is key exchange, there are even algorithms developed to do just that. If you are not going to do that, then you must set a pre shared key when you ship this so called device. Even if you don't do that, and want users to generate keys themselves, what are you going to do then? How are you going to input the public key of other party into the device securely? (Assuming you are talking about asymmetric encryption)

Both generate their own secret and public keys. Then the devices can listen and extract a number from the same source on the internet: like NIST beacon or any blockchain. This is how you can start chatting right away with any one owning the same device.

If the device is connected to the internet, and is getting keys from internet, that defeats purpose of it. Man in the middle attacks are much simpler to perform than breaking the encryption. I think your imagination got away from you, you need to be more realistic.

[Borilla]

sorry I was contacted by people interested to produce this device and for now they want me to erase all my answers

[PrimeNumber7]

I thought about a device that can encrypt what you type character after character! You type a character it is encrypted directly between your keyboard and your computer. What you see on your screen is another character.

<>
 So even if you have a keylogger malware you can send secure messages.

Are you saying that if I typed "x" that something other than "x" would be displayed? Or would the screen display "x"?

If it is the former, you may as well not display anything. And the arguments about the time to decrypt would be moot. If it is the latter, it would not actually prevent keyloggers. Someone with access to your computer would be able to know that you pressed "x". The decryption key would also need to be stored in RAM, so an attacker would be able to obtain the decryption key and decrypt messages. The only thing this setup would protect against would be a device that a keyboard is plugged into that plugs into your computer.

[eckmar]

sorry I was contacted by people interested to produce this device and for now they want me to erase all my answers

yeah right...

I thought about a device that can encrypt what you type character after character! You type a character it is encrypted directly between your keyboard and your computer. What you see on your screen is another character.

<>
 So even if you have a keylogger malware you can send secure messages.

Are you saying that if I typed "x" that something other than "x" would be displayed? Or would the screen display "x"?

If it is the former, you may as well not display anything. And the arguments about the time to decrypt would be moot. If it is the latter, it would not actually prevent keyloggers. Someone with access to your computer would be able to know that you pressed "x". The decryption key would also need to be stored in RAM, so an attacker would be able to obtain the decryption key and decrypt messages. The only thing this setup would protect against would be a device that a keyboard is plugged into that plugs into your computer.

I don't think its any use of explaining that to the OP. If you take a look at the thread, a few different people tried to explained why it won't work for different reasons but OP doesn't understand any of the answers. He is obviously not a developer, and doesn't have a technical background. This is just a wild imagination.

[NeuroticFish]

a device that can encrypt what you type character after character

Um, I fear that such a device's "encryption" will only create permutations (mix up) of the actual printable characters. And I am not convinced it will work properly with unexpectedly large character sets.
Also, if the hacker expects an user types mostly in a certain language, it won't be too difficult to find the key based on what characters come out most often.

a few different people tried to explained why it won't work for different reasons but OP doesn't understand any of the answers. He is obviously not a developer, and doesn't have a technical background. This is just a wild imagination.

I hope that my explanation is simpler 
And yeah, it won't work, not like that.

[Borilla]

you guys are funny I come with a specific question but you can't help to assume and judge not even answering

I feel sorry for you eckmar, I answered all your questions and you still can't get a clue or pass your own mental restrictions
You legendary badge won't protect from ridicule lol

I erased some answers because otherwise the idea isn't patentable and I  just want someone to build it

[NotATether]

sorry I was contacted by people interested to produce this device and for now they want me to erase all my answers

Why? bitcointalk.org posts (particularly threads topics with ideas in them such as yours) are NOT eligible for patent protection.