Preserved Topic: Trying to learn encryption methods... (Page 1 of 1)

My friend is trying to teach me encryption but I'm not really understanding things...

He gave me this as a first example...

Say this is a Password: aaaba abbab abbab ababa baaba babaa abbab
And this is a Login: AG BE RH EA RS BE

and sent me to a few sites to study more on the matter.

Well I managed to figure out that the password is in the "BACONIAN (25-letter plaintext maximum)" format

A = aaaaa E = aabaa I/J= abaaa N = abbaa R = baaaa W = babaa
B = aaaab F = aabab K = abaab O = abbab S = baaab X = babba
C = aaaba G = aabba L = ababa P = abbba T = baaba Y = babba
D = aaabb H = aabbb M = ababb Q = abbbb U/V= baabb Z = babbb

So the password would come out to be "COOLTO" if I did it right...

But I can't find any info about the type of encryption he is using in his "log-in" example

He said the cipher for the log-in needs no key table.

I don't understand what he means and he won't be back for another few days since he is away on business, I can't wait that long lol. So can any of you gurus explain this to me or point me to some good reading?

He will have more harder things for me to figure out later after I finish this one.

Thanks in advance for any help...
oh and please don't just give me the answer, i'd like to know how it's done aswell

[This message has been edited by Synthetic (edited 07-27-2002).]

You have 2 main types of encryption symmetric and asymmetric. The example here is symmetric in that the "key" (the replacements for the letters) is the same when encrypting and decrypting the message. In other words A = aaaaa whether you are encrypting or decrypting the message. These types are relatively (depending on the algorithm used to encrypt the message, this method is about the simplest) insecure. Other types rely on public and private key's. Your public key you make availible to others to encrypt their message however once encrypted they require your private key to decrypt. This allows you to transfer data most securely since anyone can send you a message however only the bearer of the private key can decrypt the message. This public key (or asymmetric) encryption is the most widely used especially using PGP.

Oh in his example I blieve he is saying that the login is not encrypted (that's it as is)



.:[ Never resist a perfect moment ]:.

or it might be encrypted by something as simple as a letter-shift
(ie A -> C, C-> E, Z ->B..) which of course wouldn't use a key-'table',but a single shift key. (at least in one way to look at it).

but then again, I didn't really look at it ;-)

since they are grouped by 2, i would think 2 combined gives 1 char of the password.

for example the first char - A + second char = new char. but that's just an example, there could be virtually endless combinations of these.

btw, my example would'n work on the example above, because R and S combined this way would be out of the range (if it's only using capital letters, that is). but hey, still an idea, isn't it

they might wrap around, lacapaca.

ooops. right!

Another way would be to re-write those letters into another pattern, usually a rectangle or sometimes a 'W' or 'M'...

i.e. 12 letters makes, 3 x 4, 2 x 6, and vise versa of each...
so for the simplest explanation, let's change the encrypted text from
::AG BE RH EA RS BE:: into ::12 34 56 78 90 12::

ex. 1)

Hey Synthetic, did you ever get the answer to that? Starting to be one of those things that bugs you until you figure it out...



________________________________________________________________
-- Jack of all trades, master of that which has my attention at
the moment.

Home Sweet Home

aaaaaaaaaaaaaaaaaahhhhhhhhhh

im new to this
this is what i tryed

=====1st

AG BE RH EA RS BE

a g b e r h e a r s b e
b h c f s ij f b s t c f
c ij d g t k g c t u d g
d k e h u l h d u v e h
e l f ij v m ije v w f ij
f m g k w n k f w x g k
g n h l x o l g x y h l
h o ijm y p m h y z ijm
ijp k n z q n ij z a k n
k q l o a r o k a b l o
l r m p b s p l b c m p
m s n q c t q m c d n q
n t o r d u r n d e o r
o u p s e v s o e f p s
p v q t f w t p f g q t
q w r u g x u q g h r u
r x s v h y v r h ij s v
s y t w ijz w s ijk t w
t z u x k a x t k l u x
u a v y l b y u l m v y
v b w z m c z v m n w z
w c x a n d a w n o x a
x d y b o e b x o p y b
y e z c p f c y p q z c
z f a d q g d z q r a d


=====2st

AG BE RH EA RS BE

AG BE RH EA RS BE
BE RH EA RS BE AG
RH EA RS BE AG BE
EA RS BE AG BE RH
RS BE AG BE RH EA
BE AG BE RH EA RS
/\
| |
gehase (not the correct password)


=====3st

AG BE RH EA RS BE

AG BE RH
EA RS BE

AG BE
RH EA
RS BE

AG
BE
RH
EA
RS
BE


=====4st

AG BE RH EA RS BE

its not binair (2)
its not decimal (10)
its not hexadecimaal (16)


Can someone plss help me?

vermaas_david(at)hotmail.com



Wherever there is darkness, I will be around.....

Hmmm...interesting.

For the last part, I got this - GFZDKF

Don't know if it is correct...I just shifted the letters by the second letter number of times in the alphabet...so AE = G (A shifted E times, i.e. 4). It could be that the letters should be shifted backwards, i.e. in reverse...haven't tried that yet...