aluiken:

Hi Carceri,

The encryption key is: C = M to the power of e MOD n

where C is the encrypted byte(s)

M is the byte(s) to be encrypted

n is the product of p and q

p is a prime number

q is a prime number

e is a number that gcd(e,(p-1),(q-1)) = 1

The decryption key is: M = C to the power of d MOD n

Where C is the encrypted byte(s)

M is the original byte(s)

n is the product of p and q

p is a prime number

q is a prime number

d is the inverse of the module MOD (p-1)(q-1)

So what you have to do now is code a proc something like:

Procedure Encrypt(Fn,OFN : String);

Var I,O : File;

Cnt : LongInt;

Buf : Array[1..4096] Of Byte;

Begin

AssignFile(I,Fn);

Reset(I,1);

AssignFile(O,OFn);

Rewrite(O,1);

Repeat

FillChar(Buf,SizeOf(Buf),#0);

BlockRead(I,Buf,SizeOf(Buf),Nr);

For Cnt := 1 To 4096 Do Begin

Buf[I] := ........

Process Encryption Here !

End;

BlockWrite(O,Buf,Nr,Nw);

Until (Nr Nw) Or (Nr = 0);

Close(O);

Close(I);

End;