Dear all,
I'm trying to figure out how to make a multiplicative cipher in SAGE.
For example, to make a multiplicative cipher:
M_9{m} = 9 x_{26} m
and to use it to encipher the text 'HAPPYNEWYEAR', I tried typing:
A = AffineCryptosystem(AlphabeticStrings())
P = A.encoding("HAPPYNEWYEAR"); P
a, b = (9, 0)
C = A.enciphering(a, b, P); C
I get back:
LAFFINKQIKAX
However, I think I should get back:
TINNQVSYQSIF
assuming A=1, B=2, C=3, D=4.... Y=25, Z=26
In order to get 'TINNQVSYQSIF', I have to type:
a, b = (9, 8)
instead of
a, b = (9, 0)
I am wondering why this is?
I had thought:
a, b = (9, 0)
should give the multiplicative cipher:
M_9{m} = 9 x_{26} m
Is this wrong?
I would be grateful for any pointers.
Kind Regards,
Avril
Avril Coghlan
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