~snip~
That means you could send your 24 words through any compromised communication channel (even post it here). And as long as no one knows the word sequence, your coins will be fine.
For many who encounter this form of backup for the first time, those words often seem like something that is quite easy to guess, especially if it is a seed that contains
"only" 12 words. However, the seed is only a simplified representation of something much more complicated, which is still impossible to break with today's technology.
Although technology is advancing unstoppably, one estimate says that it would take more than 19 million years to crack 24 words seed. As things stand for now, we are pretty much covered, at least in that regard
This depends a little bit if all words are independent. If yes the will be 24! = 620.448.401.733.239.439.360.000 permutations of the words. Assuming that you computer can check 1 billion permutations per second (which is is way too optimistic as this would assume that a signature / public key could be computed within one clock cycle which he can't) this would mean that your computer still would need 620.448.401.733.239 seconds which is 19674289 (19.6 million) years as the absolut minor / lower bound. This estimation however does not take into account technological breakthroughs in computing hardware which could very well happen in that time frame (: