65200+ entries in 0.038s
a111: Logged on 2018-10-29 15:53 mircea_popescu: it is entropy* conserving, where entropy* is a special "entropy-colored-for-meaning", but
this isn't useful.
mircea_popescu: right. anyway, back
to
the practicals -- are sbox outputs ~equiprobable~ ?
mircea_popescu: asciilifeform
the objection you had, you know, "this is
trivially
true but is not what we want" goes very much
to
the core of
the issue -- cryptographic notions of strength are very hard
to meaningfully describe mathematically because htey're always "obviously
this has ONE
trivial solution, but does it have more
than
the one ?!" math deals in 0 and 1s, it's ill equipped
to deal with
this batshit nonsense.
asciilifeform: but after
this, it chews
the cud, e.g. W(8) = RLeft11(xor(RLeft11(xor(a,d,f,h)),RLeft11(xor(d,g,RLeft11(xor(a,d,f,h)),RLeft11(xor(c,f,h,RLeft11(xor(b,e,g,RLeft11(xor(a,d,f,h)))))))),RLeft11(xor(f,RLeft11(xor(a,d,f,h)),RLeft11(xor(c,f,h,RLeft11(xor(b,e,g,RLeft11(xor(a,d,f,h)))))),RLeft11(xor(e,h,RLeft11(xor(b,e,g,RLeft11(xor(a,d,f,h)))),RLeft11(xor(d,g,RLeft11(xor(a,d,f,h)),RLeft11(xor(c,f,h,RLeft11(xor(b,e,g,RLeft11(xor(a,d,f,h))))))
mircea_popescu: the function which
takes all numbers <4
to
themselves and all numbers >4
to 4.
mircea_popescu: the problem with one's preoblems is
that
they rarely have
the decency.
mircea_popescu: it is entropy* conserving, where entropy* is a special "entropy-colored-for-meaning", but
this isn't useful.
☟︎ mircea_popescu: consider
the sets P {1,2,3,4} and E {1,2,3,4,5}. now,
the function
taking all numbers <4
to
themselvews and 4
to either 4 or 5 with 50-50 probability IS in fact reversible (because E5 and E4 are directly P4). is however not in fact entropy conserving.
mircea_popescu: i can reverse it, cuz P4 or P5 are E4 so i need
to now nothing.
mircea_popescu: consider
the sets P {1,2,3,4} and E {1,2,3,4,5}. now,
the function
taking all numbers <4
to
themselvews and 4
to either 4 or 5 with 50-50 probability IS in fact reversible
a111: Logged on 2018-10-29 03:26 asciilifeform: nao, exercise for
the reader : find
the bandwidth of
this channel ( how many bits , if more
than one, can be stuffed into a block and still preserve
this property ) ...
mircea_popescu: asciilifeform
this isn't much of an argument, let alone "proof". + and * also conserve entropy, yet y=x/2 - x/2 +4 does not.
mircea_popescu: using
the words is worth nothing ; if not used by a lord
they're powerless.
a111: Logged on 2018-10-29 00:44 mircea_popescu: anyway,
the likely reason
they don't publish scratchwork is
that before republic, nobody had any fucking idea how
to do intellectual work. q is a lot like asking "why would doctors not wash hands". because before someone
told
them
to,
they didn't,
that's why.
deedbot: BingoBoingo rated nicoleci 2 << Mircea's chattle, summarizer in
training, Outside
the Wire
BingoBoingo: !!rate nicoleci 2 Mircea's chattle, summarizer in
training, Outside
the Wire
BingoBoingo: !!rate nicooleci 2 Mircea's chattle, summarizer in
training, Outside
the Wire
BingoBoingo: We've documented our victories well, but when explaining
to heathens why, collections of log links where
the path
to victory happens and is discussed often don't quite do it on
their own
mircea_popescu: BingoBoingo
that's a good idea incidentally. lotta stuff we invented last
tuesday and in
the brief interval became seemingly "older
than dirt" / "in kindergarten!!!" is in fact entirely unheard of outside
the walls.
mircea_popescu: anyway,
the likely reason
they don't publish scratchwork is
that before republic, nobody had any fucking idea how
to do intellectual work. q is a lot like asking "why would doctors not wash hands". because before someone
told
them
to,
they didn't,
that's why.
☟︎ BingoBoingo: Like other Republic pursuits we have experience, practice, and doctrine in
the logs but like other
things (v state of
the art) it could benefit from collection
BingoBoingo: asciilifeform: It's not for heathens. It's for me and whoever else reads
to repackage for heathens.