Question
Prob. 2 [5 marks] a. Consider an affine cipher operating on a language with 851 characters (i.e., calculations are done mod 851 instead of mod
Prob. 2 [5 marks] a. Consider an affine cipher operating on a language with 851 characters (i.e., calculations are done mod 851 instead of mod 26). How many valid keys do we have in this case? Hint: 851=2337 b. Consider the Hill cipher studied in class. Can the matrix ( 2 4 8 6 ) be used as an encryption key? Why?
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Advances In Spatial And Temporal Databases 11th International Symposium Sstd 2009 Aalborg Denmark July 8 10 2009 Proceedings Lncs 5644
Authors: Nikos Mamoulis ,Thomas Seidl ,Kristian Torp ,Ira Assent
2009th Edition
3642029817, 978-3642029813
