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Closed 11 years ago.
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How are Software License Keys generated?
How do software programs verify the product key offline? Is there already a list of possible keys in the db, or does the program decode the input key in some way? If the latter, how is the decoding done?
Well, there are multitudes of algorithms that can be used to encode/decode product keys (using matricies etc.), but one of the more common methods is by use of a program called Keygen. For more information on Keygen, check out this link.
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How to draw a tree representing a graph of connected nodes?
(4 answers)
Closed 6 years ago.
I will be building a program on how to construct a NFA , the output of this particular program is visualise out the NFA in a graphical user interface. The final output of the program must be something like this:
My question is how do I get started on "drawing" the states in circle , adding edges , inserting the input between two states, how do I program the GUI part by using java? please help me out..
Ty to look to https://github.com/jgraph/mxgraph. There is swing/web examples. Manual is here https://jgraph.github.io/mxgraph/.
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Playing an arbitrary tone with Android
(10 answers)
Closed 3 years ago.
So I'm trying to find out if its possible to create some sound waves that I can then manipulate using java, more specifically for the android platform. The Idea is to get integer values and using that, dynamically change pitch/pulse based on user input. I've looked into the soundpool class and it seems that that only handles sampled audio, I'm wondering if there is any way to actually generate it using code.
I'm assuming that if so, each wave generated would have to use it's own thread in order to manipulate them independently. Can someone confirm this?
Any help in the right direction is appreciated.
So I found this question whose highest voted answer is pretty much exactly what I was looking for. In any case, here's the link for reference:
Playing an arbitrary tone with Android
This question is almost identical to a previous question (Keyboard Layout library to find Neighboring Keys given an input key). However, that question is 5 years old.
Is there a library I can import that will tell me, for a given key k, which keys neighbor k? I know I can manually create this mapping, but it would be great if something more robust was already out there.
Per Alex's comment, this is for a US English QWERTY keyboard.
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Trie data structures - Java [closed]
(3 answers)
Closed 9 years ago.
I need to create a trie in Java for my Boggle game. I have tried searching for this site for help before hand but only got answers for C or Python but nothing on Java.
Anyways to keep it short, I was wondering how one would go about storing a dictionary (so like a text file of words; around 100k words) into a trie. I've read up about the trie and found it hard to visualize code for it.
Specifically I'm looking for steps to follow when programming (so like what methods I should include and what they do).
Any help would be appreciated!
Have you looked at TrieST? I really suggest you do. Otherwise, I suggest reading this article. Maybe also this one.
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I want to find the RSA code in both Javascript and Java code. And they can return the same result in encrypt and decrypt.
My purpose is: I can encrypt a message in the user's browser using Javascript (with the public key). After I can decrypt that message in my server (with private key).
I found on internet but Javascript and Java return difference result: if I encrypt using Javascript, I cannot decrypt using Java.
This is not a good idea.
RSA public key encryption is suitable for encrypting a session key, not the entire message. It's too slow and it's susceptible to a man-in-the-middle attack when used directly.
Just use SSL and be done with it.
I am curious why the javascript and java had different results, as RSA isn't platform dependent, but, converting the key to a byte array can differ, so that could be your difficulty.
If you are encrypting a password then it may make sense to use RSA, as the number of bytes that can be encrypted/decrypted is related to the length of the key.
Where you found the source code for Java and Javascript would be useful to see, or at least to know how the keys were turned into byte arrays, and then the private or public keys were created from those.
Here is a simple RSA algorithm for Javascript (numbers only); you can easily convert it to Java by following the source code of the page:
http://www.alporal.com/rsa.htm