#6565: substitution cryptosystems: converting a key from alphabetic to numerical
values
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Reporter: mvngu | Owner: somebody
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.1.1
Component: cryptography | Keywords: substitution cryptosystem
Reviewer: | Author:
Merged: |
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Description changed by mvngu:
Old description:
> The class {{{SubstitutionCryptosystem}}} accepts keys whose values are
> alphabetic characters. We should implement a method to allow a key
> to be converted between alphabetic characters and numerical values. For
> example, here is what I have in mind:
> {{{
> sage: A = AlphabeticStrings()
> sage: S = SubstitutionCryptosystem(A)
> sage: key = S.random_key()
> ABC
> sage: S.alphabet_to_numbers(key)
> 012
> sage: S.numbers_to_alphabet([0, 1, 2])
> ABC
> }}}
New description:
The class {{{SubstitutionCryptosystem}}} accepts keys whose values are
alphabetic characters. We should implement a method to allow a key
to be converted between alphabetic characters and numerical values. For
example, here is what I have in mind:
{{{
sage: A = AlphabeticStrings()
sage: S = SubstitutionCryptosystem(A)
sage: key = S.random_key()
ABC
sage: S.alphabet_to_numbers(key)
012
sage: S.numbers_to_alphabet([0, 1, 2])
ABC
}}}
Generalizing from this, we can also have methods to do the following
conversions:
* from alphabetic characters to binary values and vice versa
* from alphabetic characters to hexadecimal values and vice versa
* from alphabetic characters to mod 26 values and vice versa
* from alphabetic characters to ASCII values and vice versa
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6565#comment:1>
Sage <http://sagemath.org/>
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