Didactic Long XOR challenge

MerickOWA · Post by **MerickOWA** » Fri Oct 10, 2008 2:54 am

For those having a hard time with this challenge. Unless it gets changed, there is more to this challenge than is stated in the problem.

Post by **adum** » Fri Oct 10, 2008 5:36 am

fixed now, thanks!

knox · Post by **knox** » Mon Oct 13, 2008 3:01 pm

I don't exactly understand "the same cipher as in Didactic XOR 2" and how to turn it into a four-byte cipher.

I have tried the answer to XOR 2, which is a word of n letters, taking the first four letters as cipher. But that didnt work.

And i have tried the cipher from XOR 2, which is a single byte value, filled up with leading zeros to become a "four-byte cipher". But that didnt work either.

I guess im lost

tails · Post by **tails** » Mon Oct 13, 2008 3:13 pm

knox, in this challenge you have to guess the value of the four bytes.

knox · Post by **knox** » Mon Oct 13, 2008 3:30 pm

tails wrote:guess the value of the four bytes.

So there is no relation to the other challenge mentioned except that both use XOR?

tails · Post by **tails** » Mon Oct 13, 2008 4:27 pm

knox wrote:So there is no relation to the other challenge mentioned except that both use XOR?

Right, there is no relation among the keys. Good luck!

knox · Post by **knox** » Tue Oct 14, 2008 9:38 am

tails wrote:no relation among the keys

Thanks a lot for clarifying this to me! Obviously i have mixed up the terms "cipher" and "key" (should have consulted a dictionary)...

muffi · Post by **muffi** » Fri Nov 14, 2008 12:52 pm

my problem with didactic xor long cipher is that the hex-word is 213 bytes long. imo 213 mod 4 =1.
what can i do with that damned 1 byte i cannot decrypt to a full character.

the_impaler · Post by **the_impaler** » Fri Nov 14, 2008 5:38 pm

muffi wrote:my problem with didactic xor long cipher is that the hex-word is 213 bytes long. imo 213 mod 4 =1.
what can i do with that damned 1 byte i cannot decrypt to a full character.

Are you sure ? I didn't count myself but groovy script said it's 212

muffi · Post by **muffi** » Tue Nov 18, 2008 9:52 am

the_impaler wrote:
muffi wrote:my problem with didactic xor long cipher is that the hex-word is 213 bytes long. imo 213 mod 4 =1.
what can i do with that damned 1 byte i cannot decrypt to a full character.
Are you sure ? I didn't count myself but groovy script said it's 212

ok, sorry i trusted "wc -m" without checking "echo 1 | wc -m" so now i know that i have to suntract 1 from the result. so there are 212 bytes. so it has to work also for me and i have to think further about this problem.