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Twts matching #birthday
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prologic
twtxt.net
 (1w ago)

Finally I propose that we increase the Twt Hash length from 7 to 12 and use the first 12 characters of the base32 encoded blake2b hash. This will solve two problems, the fact that all hashes today either end in q or a (oops) 😅 And increasing the Twt Hash size will ensure that we never run into the chance of collision for ions to come. Chances of a 50% collision with 64 bits / 12 characters is roughly ~12.44B Twts. That ought to be enough! – I also propose that we modify all our clients and make this change from the 1st July 2025, which will be Yarn.social’s 5th birthday and 5 years since I started this whole project and endeavour! 😱 #Twtxt #Update

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lyse
lyse.isobeef.org
 (19w ago)
↳ In-reply-to » For Example:

I don’t get why displaying nick@domain is preferred over just @nick in the first place. The twtxt world here is so small (and hopefully will always be) that duplicate nicks are just not an issue from my point of view. And even if there are several feeds with the same nicks, one probably does not follow both of them. Yes, there’s the birthday paradox, but I’d guess we have a slightly larger nickname space than days in a year.

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bmallred
staystrong.run
 (25w ago)

Kissimmee - Long run: 7.25 miles, 00:09:55 average pace, 01:11:52 duration
fun long run while we were at universal studios for a friends birthday. google maps thought there were some cut-throughs but was obviously wrong so just kind of winged it. was able to run around some of the “pioneer village” which was a good change in scenery.
#running

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falsifian
www.falsifian.org
 (33w ago)

@prologic@twtxt.net earlier you suggested extending hashes to 11 characters, but here’s an argument that they should be even longer than that.

Imagine I found this twt one day at https://example.com/twtxt.txt :

2024-09-14T22:00Z Useful backup command: rsync -a “$HOME” /mnt/backup

Image

and I responded with “(#5dgoirqemeq) Thanks for the tip!”. Then I’ve endorsed the twt, but it could latter get changed to

2024-09-14T22:00Z Useful backup command: rm -rf /some_important_directory

Image

which also has an 11-character base32 hash of 5dgoirqemeq. (I’m using the existing hashing method with https://example.com/twtxt.txt as the feed url, but I’m taking 11 characters instead of 7 from the end of the base32 encoding.)

That’s what I meant by “spoofing” in an earlier twt.

I don’t know if preventing this sort of attack should be a goal, but if it is, the number of bits in the hash should be at least two times log2(number of attempts we want to defend against), where the “two times” is because of the birthday paradox.

Side note: current hashes always end with “a” or “q”, which is a bit wasteful. Maybe we should take the first N characters of the base32 encoding instead of the last N.

Code I used for the above example: https://fossil.falsifian.org/misc/file?name=src/twt_collision/find_collision.c
I only needed to compute 43394987 hashes to find it.

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quark
ferengi.one
 (3y ago)

Now, onto the real question: what to eat? Partner isn’t home, so zero nutritional supplements have been consumed, and I have been lazy enough not to go out to fetch me something. So… hmm, yeah. Going to an eight years old niece birthday “roller scatting” party in an hour, maybe I get lucky with a slice of pizza, or two. 🤣

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