david wong

Hey! I'm David, a security engineer at the Blockchain team of Facebook, previously a security consultant for the Cryptography Services of NCC Group. I'm also the author of the Real World Cryptography book. This is my blog about cryptography and security and other related topics that I find interesting.

Discrete logarithms in Multiplicative prime groups posted March 2016

I'm doing some tests on how Pollard Rho performs. I implemented the thing in Sage here and it doesn't perform that well I found. Pollard Kangaroo is also bad, but that must come from my implementation (I didn't really go further here since I don't really need Kangaroo: I already know the order + the value I'm looking for is not in any particular interval)


old_rho is Pollard rho, rho_lambda is the mislabeled Pollard Kangaroo algorithm, trials is the simple enumeration.

I implemented the algorithm in Go, along some nice functions/variables that make Go's bignumber library a bit easier to tolerate. And guess what? What takes Sage 63 seconds to compute only take Go 5 seconds. The implementation is a copy/paste of what I did in Sage, no optimizations.

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