On Sat, Aug 8, 2015 at 7:36 AM, Alec Muffett alecm@fb.com wrote:
- 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?