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Aug
17
awarded  Yearling
Aug
17
accepted What is the difference between a PRF and a PRF+?
Jul
27
awarded  Popular Question
Jul
7
comment What is the difference between a PRF and a PRF+?
Also, a follow on question: Is it safe to understand IKEv2's definition of PRF+ and IKEv1/TLS's definition of PRF as to mean the same thing? Are both simply each individual protocol's strategy to create a arbitrary length output which is always identical if starting with identical inputs?
Jul
7
comment What is the difference between a PRF and a PRF+?
Hi Poncho, thanks for the answer. I am was nearly going to mark it as the right answer, but I'm still not sure I fully understand your answer. I don't suppose you could dumb it down just a bit, write it to a target audience that isn't as well versed in crypto or college math?
Jul
7
asked What is the difference between a PRF and a PRF+?
Jun
17
awarded  Popular Question
Jan
4
accepted How does ECDH arrive on a shared secret?
Jan
4
comment How does ECDH arrive on a shared secret?
To avoid continuing the back and forth in Comments, I created a Chat Room and have posted a few more questions there.
Jan
4
comment How does ECDH arrive on a shared secret?
I see... ok, just to again make sure I understand.. and thanks to @StephenTouset's nugget of wisdom (thanks Stephen!). When Alice is dotting $g$ to itself $a$ times, Alice isn't really doing the "dot" operation $a$ times, but is somehow using a magical math formula that gets Alice $A$ much quicker than actually doing the "dot" $a$ times. So the final $S$ from Alice's perspective is $g$ dot $g$ $b$ times to get $B$ (supplied by Bob), then $B$ dot $B$ $a$ times. And from Bob's: $A$ dot $A$ $b$ times. Which ends up at the same point in the curve... the shared secret.
Jan
4
comment How does ECDH arrive on a shared secret?
Let me just confirm I understand you...Everyone knows the starting point ($g$), everyone knows where Alice ended up ($A$), everyone knows where Bob ended up ($B$), and everyone knows the actual elliptic curve. But only Alice knows how many iterations of "dot" she did ($a$), and only Bob knows how many iterations he did ($b$). And once they know each other's $A$ and $B$, they then continue the other's "dot" operation. AKA, Alice takes $g$ and $B$ and "dots" it $a$ more times, and Bob takes $g$ and $A$ and "dots" it $b$ more times, and they both land at $S$, the shared secret... is that it?
Jan
4
revised How does ECDH arrive on a shared secret?
added two <BR> tags for formatting
Jan
4
asked How does ECDH arrive on a shared secret?
Dec
8
awarded  Commentator
Dec
8
comment What is the functional role of CKY-I and CKY-R in ISAKMP (IKEv1)?
@e-sushi thanks for the edits, looks much better now.
Dec
8
comment What is the functional role of CKY-I and CKY-R in ISAKMP (IKEv1)?
Awesome, thanks for your answer Poncho! That clears that up for me!
Dec
8
accepted What is the functional role of CKY-I and CKY-R in ISAKMP (IKEv1)?
Dec
5
asked What is the functional role of CKY-I and CKY-R in ISAKMP (IKEv1)?
Dec
2
comment SHA1 - SSL/TLS Cipher Suite
There is also some good information about this in this question: crypto.stackexchange.com/questions/19286/…
Sep
25
awarded  Supporter