[tor-dev] Future Onion Addresses and Human Factors

grarpamp grarpamp at gmail.com
Sat Aug 8 22:48:08 UTC 2015

On Sat, Aug 8, 2015 at 7:36 AM, Alec Muffett <alecm at fb.com> wrote:
> 9) appending a credit-card-like “you typed this properly” extra few
> characters checksum over the length might be helpful (10..15 bits?) -
> ideally this might help round-up the count of characters to a full field,

> a1uik-0w1gm-fq3i5-ievxd-m9ceu-27e88-g6o7p-e0rff-dw9jm-ntwkd-sdXXX.onion

Checksums need to detect more bits than the 0-n number of expected errors.
At the apparent 56^(26+10) ~=2^205 above, there may also be no need
to give typo feedback if the error rate is unlikely to result in some other
valid address. And just where exactly and in what protocols and apps are
going to build in that feedback popup... browsers? ssh? MUA? ping? skype?

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