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VB How would I make

 
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PostPosted: Thu Aug 28, 2008 9:39 am    Post subject: VB How would I make Reply with quote

How would I make a serial that you can't really crack, or make it have better security then just "If text1 = "" then" Can anyone help? Thanks. Smile
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Symbol
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PostPosted: Thu Aug 28, 2008 10:14 am    Post subject: Reply with quote

Use a one-way encryption? then you can only brute force or try and crack, which I doubt you'll find the password unless it's something obvious like "hi" or "hello", I doubt you could crack something like "76F7AC6D3-D9A97B6D-C87A5D3A" encrypted with a one-way encryption, such as MD5.
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pkedpker
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PostPosted: Thu Aug 28, 2008 3:42 pm    Post subject: Reply with quote

use byte arrays.. they wont show up as strings and when u compare u dont compare the whole answer.. but u compare 1 letter a time.. and makes it a little bit harder to crack.. but dunno i'd also use a table of letters to mask the oringals with different ones. like a becomes bc b becomes ca something complicated.. so it will look like garbage.. but yah md5 is 1 way atm so it can't be decrypted wont be a good serial system.. ill find the md5 change it to my own.. and its cracked.
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&Vage
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PostPosted: Thu Aug 28, 2008 5:04 pm    Post subject: Reply with quote

for(int i=0;i>strlen(input) && password[i] != NULL;i++){
if(input[i] == password[i])
correct += 1;
else
break;
}

something around that
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dnsi0
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PostPosted: Thu Aug 28, 2008 5:25 pm    Post subject: Reply with quote

Thats C++... ._.

Convert it (Not saying that I cant convert, but im lazy to convert and i gtg)
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Slugsnack
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PostPosted: Fri Aug 29, 2008 4:52 am    Post subject: Reply with quote

_void_ wrote:
for(int i=0;i>strlen(input) && password[i] != NULL;i++){
if(input[i] == password[i])
correct += 1;
else
break;
}

something around that


Would be ridiculously easy to reverse that. Breakpoint at each CMP or in fact since you hardcoded the password as a string array..
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Symbol
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PostPosted: Fri Aug 29, 2008 10:42 am    Post subject: Reply with quote

It won't even go inside the loop, since he checked i > strlen(input), so unless the password length is -1, which is impossible, it won't even go inside the loop.
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dnsi0
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PostPosted: Fri Aug 29, 2008 10:57 am    Post subject: Reply with quote

K I made a crack me like that try to crack it. Its in the crack me section.

Its vb so If you cant crack it then suck up what you just said.
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xDemonx
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PostPosted: Fri Aug 29, 2008 1:56 pm    Post subject: Reply with quote

Symbol wrote:
Use a one-way encryption? then you can only brute force or try and crack, which I doubt you'll find the password unless it's something obvious like "hi" or "hello", I doubt you could crack something like "76F7AC6D3-D9A97B6D-C87A5D3A" encrypted with a one-way encryption, such as MD5.


I googled for "one way encryption visual basic"
And found this, it might be usefull to some people.
http://forum.catalyst2.com/showthread.php?t=503
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