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ihabed@uncc.edu (Ibrahim H Abed) writes:

>I was wondering does encryption with C++ offer some advantages/dis-
>advantages over C?  Would the object-oriented approach to programming
>in C++ help in some of the complicated operations involved in encryption
>methods such as DES and other complicated schemes?

I used a template matrix class in a program to break Hill encipherment.
Breaking the code is equivalent to multiplying the ciphertext by the
inverse of the plaintext to get the key, and enciphering is equivalent
to multiplying the plaintext by the key to get the ciphertext. In C++,
I performed these operations with the * and / operators in my matrix
class, and the matrix class was instantiated using a modulus class that
performed modulo n arithmetic. Thus in my program, breaking the code and
encrypting and decrypting were one statement; I saw one of my classmates'
C programs, and it looked horrendus, with things like an array named "temp"
in the deciphering process. C++ lends itself to a cleaner design.

With an arbitrary length integer class, RSA becomes very easy; you would
use the overloaded pow function in the class to perform encryption and
decryption.

In C the code would be messier at best, and at worst you would either
have to write all your own code or rewrite old code; in C++ you can
reuse the same old code unchanged.
-- 
Steve Chapel        schapel@cs.ucsb.edu   |   http://www.cs.ucsb.edu/~schapel
   Senior in Computer Science at the      |   finger -l schapel@eci1.ucsb.edu
University of California, Santa Barbara   |        PGP key on the way...