any way like cryptography to garantee this exchange ?
depends on what you mean by guarantee. if it means authenticity and integrity, signing and MACs are your friend
what if one of them gets the data and doesnt give other ones data to him i want to prevent this and it should be with no third party (sorry for my english)
so it means deniability. again this can be achieved with signing
Hey, it looks like someone found your question weird and thinks you're having an XY problem! Do make sure you're not running into that and provide proper info/desc/logs/what_you_tried etc.
what?
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