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“Keep Me Logged In” - the best approach
...in, generate a large (128 to 256 bit) random token. Add that to a database table which maps the token to the userid, and then send it to the client in the cookie.
What if the attacker guesses the random token of another user?
Well, let's do some math here. We're generating a 128 bit random token....
Design patterns to avoid [closed]
...ou need to follow them to some degree in order to create isolated and repeatable unit tests.
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Image comparison - fast algorithm
I'm looking to create a base table of images and then compare any new images against that to determine if the new image is an exact (or close) duplicate of the base.
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How to find a Java Memory Leak
...ed. Basically, I can tell that there are several hundred megabytes of hash table entries ([java.util.HashMap$Entry or something like that), but maps are used all over the place... Is there some way to search for large maps, or perhaps find general roots of large object trees?
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How do you rotate a two dimensional array?
...overall matrix:
+-----+--------+------------------+
| N×N | Layers | Rotatable Layers |
+-----+--------+------------------+
| 1×1 | 1 | 0 |
| 2×2 | 1 | 1 |
| 3×3 | 2 | 1 |
| 4×4 | 2 | 2 |
| 5×5 | 3 | ...
How does this giant regex work?
...PHP to see the corresponding output, or look up each character in an ASCII table
– Michael Mrozek
Jul 25 '10 at 6:14
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Proper way to rename solution (and directories) in Visual Studio
... I had to hunt down why I was getting some type of duplicate error for the table classes. Once I removed those from the project, it worked fine. Hopefully this helps. And thanks, Edoardo!
– Steve
Dec 19 '17 at 16:29
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What are the advantages of using a schema-free database like MongoDB compared to a relational databa
... often represent in a single entity a construct that would require several tables to properly represent in a relational db. This is especially useful if your data is immutable.
Deep query-ability. MongoDB supports dynamic queries on documents using a document-based query language that's nearly as po...
What's the best way to communicate between view controllers?
... up and push the controller onto the stack. But as I've become more comfortable with the SDK, I've drifted away from that, and now I usually have the parent push the child.
For #3, consider this example. Here we are using two controllers, AmountEditor and TextEditor, to edit two properties of a T...
How Scalable is SQLite? [closed]
...g edits and realize that there are ways of speeding up SQLite to have acceptable performance.
– Kyle Cronin
Jul 23 '09 at 17:03
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