Re: encryption program

> > * The two 'e's in the first word have different ciphertext equivalents,
> >   so it's not a single-alphabet substitution
> yes

Could be homophonic substitution or possibly (more probably, in my 
estimation, polygram substitution. There is also the possibility of a 
polyalphabetic cipher...
 
> I also likes "follows": "vkbcjtp" note how ll gets translated to "bc".
> That suggest that after some encryption of each letter from the plaintext
> there is a consecutively increasing number added.

This tends to suggest polyalphabetic substitution.

 

  Datacomms Technologies web authoring and data security
       Paul Bradley, Paul@fatmans.demon.co.uk
  Paul@crypto.uk.eu.org, Paul@cryptography.uk.eu.org    
       Http://www.cryptography.home.ml.org/
      Email for PGP public key, ID: 5BBFAEB1
     "Don`t forget to mount a scratch monkey"

paul@fatmans.demon.co.uk wrote:
> 
> 
> > > * The two 'e's in the first word have different ciphertext equivalents,
> > >   so it's not a single-alphabet substitution
> > yes
> 
> Could be homophonic substitution or possibly (more probably, in my 
> estimation, polygram substitution. There is also the possibility of a 
> polyalphabetic cipher...
>  
> > I also likes "follows": "vkbcjtp" note how ll gets translated to "bc".
> > That suggest that after some encryption of each letter from the plaintext
> > there is a consecutively increasing number added.
> 
> This tends to suggest polyalphabetic substitution.

what do you mean, polyalphabetic substitution?

	- Igor.