[Cryptography] Came up with a weird use case, got questions

[paulv]

I was wondering about something like this myself (I called it a digitale
time-capsule, like the one's you put in the ground). For me it was a way to
make sure that information can survive any censuring regime, by encypting
now and decrypting in a (faraway) future. The idea was to setup a destributed
network with encrypted content (bittorrent with encrypted files by archiving
organisations around the world that mirror each others content automaticly).

The one thing I came up with was using a short key, so that - if Moore's 
law still applys in the future - the key could be bruteforced in the future.
(And useing RSA, so that advances in crypto (quantum computing / factoring) 
could be used to decrypt a private key given a pub-key). 

So 2 possible mechanism's are : 

* difficulty (brute force of problem becomes possible in the future)
* class of problem (the whole problem class will be solved in the future)

(And of course these 2 could be both used, so that if one assumption proves
to be wrong, the other might still be right)

Any other mechanism's/idea's are very welcome, and could help a lot.

=paulv

 
>    My mom passed in 2013. I had a nice day, where my wife, daughter, and
>    myself, went to an interesting and fun wedding today. I had a random
>    thought, that I would have loved to talk to my mom, and tell her about
>    it.
>    Obviously, not possible, short of a OUIJA board. :)Â  So I thought
>    about writing a letter. So where do I post it?
>    So I thought of a website, where you can send letters to people, a la
>    Postsecret. But it's harder to anonymize electronic  messages.Â
>    Soooo, how about a system that automatically encrypts incoming emails?
>    And then, some time later, it decrypts, long after anyone who wrote
>    those letters is alive? Say 100 years. I'd write a letter to my mom
>    which would be auto-decrypted 100 years later and given to the public.
>    A la Post secret, and historical interest.
>    Any systems out there which will auto-decrypt, not based on a clock
>    (which can be spoofed), but instead based on an event, a piece of
>    information, a trusted info source? Something like the Long Now
>    foundation's clock?
>    Weird use case, I apologize. Just a thought.

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