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Full Discussion: Masking algorithm
Top Forums Shell Programming and Scripting Masking algorithm Post 302951089 by n78298 on Sunday 2nd of August 2015 03:07:32 AM
Old 08-02-2015
This is not an assignment; this is a real time challenge. Apologies for not articulating problem in the correct manner and fully explaining the issue.
Maybe calling it a masking solution is not the right thing. My actual requirement is to replace a set of characters with another set of character. That too a character by character replacement so reverse decryption can be easily achieved as well.
As it’s character by character replacement every character will have one and only one replacement character. Hence ABCDE should convert to BCDEF where replacement algorithm is like
Code:
A : B
B : C
C : D
D : E
E : F

The first character to be found and replaced by second character.
 

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ost::IPV6Mask(3)					     Library Functions Manual						  ost::IPV6Mask(3)

NAME
ost::IPV6Mask - Internet addresses used specifically as masking addresses (such as ' 255.255.255.0') are held in the IPV6Mask derived object. SYNOPSIS
#include <address.h> Inherits ost::IPV6Address. Public Member Functions IPV6Mask (const char *mask) Create the mask from a null terminated ASCII string such as '255.255.255.128'. Friends __EXPORT IPV6Host operator& (const IPV6Host &addr, const IPV6Mask &mask) Masks are usually used to coerce host addresses into a specific router or class domain. Additional Inherited Members Detailed Description Internet addresses used specifically as masking addresses (such as ' 255.255.255.0') are held in the IPV6Mask derived object. The separate class is used so that C++ type casting can automatically determine when an IPV6Address object is really a mask address object rather than simply using the base class. This also allows manipulative operators for address masking to operate only when presented with a Masked address as well as providing cleaner and safer source. Author: David Sugar dyfet@ostel.com Internet Address Mask such as subnet masks. Constructor &; Destructor Documentation ost::IPV6Mask::IPV6Mask (const char *mask) Create the mask from a null terminated ASCII string such as '255.255.255.128'. Parameters: mask null terminated ASCII mask string. Friends And Related Function Documentation __EXPORT IPV6Host operator& (const IPV6Host &addr, const IPV6Mask &mask) [friend] Masks are usually used to coerce host addresses into a specific router or class domain. This can be done by taking the Inet Host Address object and 'and'ing it with an address mask. This operation can be directly expressed in C++ through the & operator. Returns: a internet host address that has been masked. Parameters: addr host address to be masked by subnet. mask inetnet mask address object to mask by. Author Generated automatically by Doxygen for GNU CommonC++ from the source code. GNU CommonC++ Sat Jun 23 2012 ost::IPV6Mask(3)
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