NEWSGROUP Cipher

avengor · Post by **avengor** » Sat Oct 10, 2009 4:53 am

I google the answer,but i don't know why the answer is that.For my english is poor,can anybody expain how the cipher works or give me a clue? thanksl

michuber · Post by **michuber** » Sat Oct 10, 2009 9:55 am

http://en.wikipedia.org/wiki/ROT13

avengor · Post by **avengor** » Sat Oct 10, 2009 10:35 am

michuber wrote:http://en.wikipedia.org/wiki/ROT13

3Q

avengor · Post by **avengor** » Sat Oct 10, 2009 10:44 am

I have to admit that i'm stupid...

pedromalta · Post by **pedromalta** » Sun Apr 17, 2011 12:27 pm

Lol, i'm too young to get that fast, took a lot of google to understand usenet, and then rot13...

yp_mick2007 · Post by **yp_mick2007** » Fri Jul 08, 2011 3:42 pm

i google it and understanding the code. 26/2 = 13; then substitution method..
example. A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z

wynk · Post by **wynk** » Sun Jan 08, 2012 5:42 pm

My solution in ruby by doing some math with the ASCII table:

Code: Select all

input = "Guvf zrffntr vf rapelcgrq va ebg 13. Lbhe nafjre vf svfupnxr."
input.each_byte { |x|
	# lower case letters
	if (65..90) === x 
		print (65 + (x - 52) % 26).chr
	# capital letters
	elsif (97..122) === x
		print (97 + (x - 84) % 26).chr
	# everything else
	else
		print x.chr
	end
}

LocoTom · Post by **LocoTom** » Sat Aug 11, 2012 8:15 pm

I knew that there would be something with the abc, but i didn't get it would be + or - 13.

daggoneit · Post by **daggoneit** » Mon Nov 12, 2012 8:00 pm

Can someone explain what this has to do with usenet?
I guessed it was ROT-13 encrypted because of the '13' right there and I have used usenet but I don't get what this has to do with it.

RixNguyen · Post by **RixNguyen** » Sat Aug 31, 2019 3:15 pm

I solved this challenge thanks to the clues in this forum, but I don't still understand that what relation between rot-13 and usenet. Sorry for my bad English.

hacker.org

NEWSGROUP Cipher

NEWSGROUP Cipher

I admit that it is really hard.