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cryptography

 
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cryptography, encryption algorithm
duygugvn
post 27 Nov, 2005 - 11:25 AM
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my functions are;
void encrypt(char sin[],char sout[],char key[];
void decrypt(char sin[],char sout[],char key[];
my encrypt function have to encrypt the input string sin using the public key key and return the encrypted string to sout.
my decrypt function have to decrypt the input string sin using the public key key and return the encrypted string to sout.ı determine the alphabet using array and calculata the codes of these strings using my alphabet.
I do not know how to use my alphabet in array????
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Mrafcho001
post 27 Nov, 2005 - 12:39 PM
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a few problems there

if you gonna be editing the content of sout you better pass it as a reference.

also this seems to be better:

CODE

void encrypt(const char *sin, char *sout, const char *key);
void decrypt(const char *sin, char *sout, const char *key);

or
CODE

char* encrypt(const char *sin, const char *key);
char* decrypt(const char *sin, const char *key);

the pointer functions above will return a pointer to the memory where the encrypted/decrepted string is stored.

Also it is a lot better to pass pointers of strings to functions because the strings can be extrememly larg and you do not want to copy the string (slowing down the program), you just want to pass it to the function.

This post has been edited by Mrafcho001: 27 Nov, 2005 - 12:48 PM
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Amadeus
post 27 Nov, 2005 - 12:58 PM
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Well, I'm not sure that answered the question...the user appears to be asking how to encrypt and decrypt using a supplied key.

Before going to deeply into this: duygugvn, are you supposed to be replacing the letters in the strings by letters or charcaters that are separated from the original by a certain number - the key?

As an FYI, arrays in C++ are always passed by reference.
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