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More formally, the password attribute of a User object is a string in this format: hashtype$salt$hash That s a hash type, the salt, and the hash itself, separated by the dollar sign ($) character. hashtype is either sha1 (default) or md5, the algorithm used to perform a one-way hash of the password. salt is a random string used to salt the raw password to create the hash, for example: sha1$a1976$a36cc8cbf81742a8fb52e221aaeab48ed7f58ab4 The User.set_password() and User.check_password() functions handle the setting and checking of these values behind the scenes.



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Performance usually comes at a price, but in the case of ADONET, the price is definitely reasonable Unlike ADO, ADONET doesn t transparently wrap OLE DB providers; instead, it uses managed data providers that are designed specifically for each type of data source, thus leveraging their true power and adding to overall application speed and performance..





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You ve seen quite a few examples of assignments, both for variables and for parts of data structures (such as positions and slices in a list, or slots in a dictionary), but there is more. You can perform several different assignments simultaneously: >>> x, y, z = 1, 2, 3 >>> print x, y, z 1 2 3 Doesn t sound useful Well, you can use it to switch the contents of two (or more) variables: >>> x, y = y, x >>> print x, y, z 2 1 3 Actually, what I m doing here is called sequence unpacking I have a sequence of values, and I unpack it into a sequence of variables. Let me be more explicit:

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No, a salted hash has nothing to do with marijuana; it s actually a common way to securely store passwords. A hash is a one-way cryptographic function that is, you can easily compute the hash of a given value, but it s nearly impossible to take a hash and reconstruct the original value. If we stored passwords as plain text, anyone who got their hands on the password database would instantly know everyone s password. Storing passwords as hashes reduces the value of a compromised database. However, an attacker with the password database could still run a brute-force attack, hashing millions of passwords and comparing those hashes against the stored values. This takes some time, but less than you might think computers are incredibly fast. Worse, there are publicly available rainbow tables, or databases of precomputed hashes of millions of passwords. With a rainbow table, an attacker can break most passwords in seconds. Adding a salt basically an initial random value to the stored hash adds another layer of difficulty to breaking passwords. Since salts differ from password to password, they also prevent the use of a rainbow table, thus forcing attackers to fall back on a brute-force attack, itself made more difficult by the extra entropy added to the hash by the salt. While salted hashes aren t absolutely the most secure way of storing passwords, they re a good middle ground between security and convenience.

ADO.NET also works in both connected and disconnected environments. You can connect to a database, remain connected while simply reading data, and then close your connection, which is a process similar to ADO. Where ADO.NET really begins to shine is in the disconnected world. If you need to edit database data, maintaining a continuous connection would be costly on the server. ADO.NET gets around this by providing a sophisticated disconnected model. Data is sent from the server and cached locally on the client. When you re ready to update the database, you can send the changed data back to the server, where updates and conflicts are managed for you. In ADO.NET, when you retrieve data, you use an object known as a data reader. When you work with disconnected data, the data is cached locally in a relational data structure, either a data table or a dataset.

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