[Cryptography] how to encrypt for the very long term?

[Richard Outerbridge]

> On 2018-07-28 (209), at 23:10:15, Mike Lisanke <mikelisanke at gmail.com> wrote:
> 
> On Fri, Jul 27, 2018 at 8:06 AM, Christoph Anton Mitterer <calestyo at scientia.net <mailto:calestyo at scientia.net>> wrote:
> Hey.
> 
> I’m basically looking into encryption of (backup) files for the very long term (like at least 20 years).

[….]

> We are taught the only provably secure cryptography is a random key as large as your data which Xor produces perfect encryption. A book cipher is a simplification
> as a book is not random data. If you use a generator for your randomness, it's not random. If you use a random data source, collect enough for your entire data, and
> have a secure place to place this random key, then, In Theory, your cryptography will remain secure forever... or until you lose (or misplace) the random key. 
> 
> -- 
> Best regards,  Mike

Also, one supposes, upon one’s  ”guaranteed” (let alone legally enforceable) bit-rot survival rate over twenty (20) years.

0.999999999 … ?  Is that enough for crypto?
__outer

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