I also strongly disagree personally (and professionally)

i disagree occasionally

Sarang, I am sorry, but my delays today on finishing this up took longer than expected, I had to cross reference another soundness proof... I'll be making comments on overleaf tomorrow. Thanks again for your patience

No problem!

Is the salt in bulletproofs' get_exponent function null terminated?

Like the "SubAddr" is in subaddress generation?

hi, given field element r, where x = r + 1/r, is it trivial to find r given x?

Koe try the quadratic formula to solve for r

Oh arbitrary field

You'd need to compute a root

Koe: over an arbitrary field the answer is no. Solutions are not unique in the complex numbers, i.e you can get collisions. If the field is Zp I will have to think about it for a few more minutes

Very interesting paper by JP Aumasson: eprint.iacr.org/2019/1492

Discusses the round choices for popular algorithms in hindsight

@n3ptune pointed out that I might have miscalc'd one of the unlock times (second versus millisecond)

Here's the raw data:

(this is just the top 20, obviously there are like 5 million rows in this table)

Oh, + hashes for good measure:

someone recently mentioned that there is some limit to the unlock time. No mention of the limit but the year 4600 mentioned yesterday seems to be a bit beyond that

For time unlock times, it's a 64 bit number of seconds since the epoch. 4600 years is going to be nowhere near the limit.

I just checked, the limit is ~600 billion years. Assuming no mistake.

moneromooo: "limit"

Lemme just stash this 0.03 XMR away until the heat death of the universe

600 billion is so much shorter than the heat death

sarang I disagree with JP aumasson at least with chacha

Yeah?

yeah, chacha has had a lot of recent stuff come out, including an allegedly efficient 8-round distinguisher

not to mention the slightly less new stuff: tosc.iacr.org/article/view/574

iirc chacha20 was originally recommended. i personally suspect that chacha will require at least 20 rounds for any hope of security that lasts more than a decade; progress is being made too quickly on that one