UTF-8 U+6211 U+662F wrote: pepperonipi wrote:
UTF-8 U+6211 U+662F wrote:Since the rules don't specify a system to convert letters to numbers for RSA and there are multiple ways you can do it, I believe the State and National tests will ask you to encrypt numbers and not words.
I hope this is the case at these tournaments so there isn’t much confusion. However, if a test does ask you to encrypt a word, I would still probably use A = 0, B = 1, etc. for turning the word into a number sequence, since that’s what’s typically done when encrypting other messages. You will get a big number, and you shouldn’t mod it prior to encoding. That’s part of the fun of encrypting RSA on five-function calculators!
It's worth noting that usually RSA encrypts words using ASCII
Exactly, that’s the problem: should we use the typical RSA text-to-number formula (ASCII) or the typical Code Busters text-to-number formula (A=0, B=1, etc.). You may think one way or the other, but others may not think the same.
I would’ve said use ASCII, but some tests (cough, cough, MIT) used the typical Code Busters text-to-number formula. That’s a problem. I checked the rules though and found a FAQ question
which basically says we won’t need to encrypt with the RSA cipher
. So that solves that problem, I guess.
On another note, have any teams tried to memorize quotes in order to get the first question extremely quickly? Seems like the winner of UPenn may have known the quote before the competition, since they solved the entire thing in less than 2 minutes...