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Is SHA-1 secure for password storage?
...ee wrong PINs.
Usually, for password security, it pays off much more to arrange the system for not letting an attacker build an offline attack. That's what Unix systems do: the hashed passwords, which used to be in the world-readable /etc/password file, are now in the /etc/shadow file which is prot...
Cocoa: What's the difference between the frame and the bounds?
...se the bounds when you are making inward changes, like drawing things or arranging subviews within the view. Also use the bounds to get the size of the view if you have done some transfomation on it.
Articles for further research:
Apple docs
View Geometry
Views
View and Window Architecture
Re...
Are there good reasons not to use an ORM? [closed]
...
There are a wide range of common problems for which ORM tools like Hibernate are a god-send, and a few where it is a hindrance. I don't know enough about your project to know which it is.
One of Hibernate's strong points is that you get to s...
What is hashCode used for? Is it unique?
... the hashCode value, takes a modulus (thus constraining the value within a range) and uses it as an index to an array of "buckets".
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What does OSGi solve?
... added to an application by including OSGi. OSGi therefore runs on a large range of devices: from very small, to small, to mainframes. It only asks for a minimal Java VM to run and adds very little on top of it.
Fast - One of the primary responsibilities of the OSGi framework is loading the classes ...
What is “callback hell” and how and why does RX solve it?
...oop example with something along the lines of:
def myLoop():
for i in range(10):
doSomething(i)
yield
myGen = myLoop()
This is not the full code but the idea is that the "yield" pauses our for loop until someone calls myGen.next(). The important thing is that we could still w...
How do cache lines work?
...the address, for example. Caches often do different things with different ranges of addresses. (e.g. cache cares about tag and index for detecting hit vs. miss, then only using the offset within a cache line for inserting / extracting data)
– Peter Cordes
Aug...
What is the difference between “JPG” / “JPEG” / “PNG” / “BMP” / “GIF” / “TIFF” Image?
... allow for 5 to 25 percent greater compression than GIFs, and with a wider range of colors. PNGs use two-dimensional interlacing, which makes them load twice as fast as GIF images.”
3 Image that has a lot of colors or requires advanced variable transparency, PNG is the preferred file type.
GIF &...
Multiprocessing - Pipe vs Queue
...msg=='DONE':
break
def writer(count, p_input):
for ii in xrange(0, count):
p_input.send(ii) # Write 'count' numbers into the input pipe
p_input.send('DONE')
if __name__=='__main__':
for count in [10**4, 10**5, 10**6]:
# Pipes are unidirectional w...
How to read a large file - line by line?
...me, searchChar='\n'): # counts number of searchChar appearing in the byte range
with open(fileName, 'r') as f:
f.seek(startByte-1) # seek is initially at byte 0 and then moves forward the specified amount, so seek(5) points at the 6th byte.
bytes = f.read(endByte - startByte + ...