Ilmari Karonen
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 1d comment Yaos Millionaire Problem: Why distance >= 2? I'm not familiar with this protocol, but looking at step 5, it seems likely that the reason why the $z$ values must differ by at least two is to avoid the possibility that $z_a = z_b+1$ for some $a$ and $b$, which could cause two of the numbers transmitted in step 5 to be identical. I'm not sure why that would actually be a problem, though. 1d reviewed Approve Yaos Millionaire Problem: Why distance >= 2? Apr 9 comment Question about "toy: streamcipher Is that scan from a textbook? Because if so, the mangled English and general lack of copyediting suggest that it's probably not very high quality. (If it's from an instructor's personal handouts, that could perhaps be excusable, at least if English isn't their native language. Although, even so, the broken grammar surely can't be making the material any easier to understand for the students.) Apr 5 awarded encryption Apr 4 awarded Nice Answer Apr 4 answered Does composing multiple substitution ciphers improve security? Apr 4 comment Decoding the Playfair cipher with a crib This is, IMO, a perfect example of a useful duplicate question; the linked question does provide the answer, but there's no way you'd guess that from the title. Upvoted and voted to close. :) Apr 2 awarded Nice Answer Mar 25 awarded Nice Answer Mar 14 revised Why do we need Euler's totient function $\varphi(N)$ in RSA? added 1567 characters in body Mar 14 comment Reverse Encryption Algorithm from Decryption code The trick with SO is that "asking for code" is really more about how you ask your question than about what you ask. You want to stand out from the "gimme teh codez 4 my homework now" crowd, so you need to phrase your question as "please teach me how to do this myself" instead of "please give me code I can copy-paste". That's really all there is to it. Mar 14 revised Reverse Encryption Algorithm from Decryption code added 273 characters in body Mar 14 comment Reverse Encryption Algorithm from Decryption code This is a decent question, and I've answered it below (although only partially so far, just in case it's an exercise you're supposed to complete on your own). However, I'm not 100% sure it really belongs on this site; it might be better suited for Stack Overflow, or perhaps for Reverse Engineering. If others feel the same way, we could always ask for a mod to migrate it. Mar 14 revised Reverse Encryption Algorithm from Decryption code edited tags Mar 14 revised Reverse Encryption Algorithm from Decryption code added 1230 characters in body Mar 14 answered Reverse Encryption Algorithm from Decryption code Mar 14 answered Why do we need Euler's totient function $\varphi(N)$ in RSA? Mar 13 revised How do I attack an RSA setup where e is even? edited tags Mar 13 comment How do I attack an RSA setup where e is even? This isn't really RSA, but a variant of the Rabin cryptosystem. See e.g. this question for the difference. Mar 3 comment Attack being kind of completely puzzled? Honestly, I don't understand it either. Maybe it needs more context (I haven't actually read the paper), or maybe something got lost in translation?