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The purpose of signing an applet is to allow the browser to identify the author of the applet and determine if the applet has been tampered with since it was signed To understand how digital signatures work, you need to understand public-key cryptography In public-key cryptography, a unique pair of keys is used to encrypt and decrypt data The keys are related mathematically; the data encrypted by one of the keys in the pair can be decrypted only by the other key Each individual, or entity (for example, a software publisher), has a unique pair of keys The entity makes one of the keys available to the public and keeps the other key private The public key allows anyone to encrypt data to send to the entity Since the corresponding private key is the only key that can decrypt this data, the sender can be con dent that the data can be decrypted only by the entity (who has exclusive access to the private key) Similarly, the entity is the only one who can encrypt data with the private key If a recipient gets encrypted data from the entity, the recipient can use the public key to decrypt the data in order to verify that the data came from the entity If the public key decrypts the data successfully, the data must have been encrypted by the private key Since the private key can be used only by the entity, the entity must have sent the data In this situation the key pair authenticates that data was sent from the entity Figure 8-1 illustrates how the public-private key pair is used to verify the authenticity of the sender Digital certi cates provide the means to verify that an entity owns a given pair of keys These certi cates are issued by a certi cate authority (CA) The entity sends a public key to the CA and requests a certi cate for the key The CA is responsible for verifying that the entity is the owner of the key pair If the CA can attest to the ownership, the CA issues a certi cate to the entity The certi cate contains the name of the entity and a bit-string representation of the public key of the entity It certi es that the entity with this name is the owner of this key The certi cate also contains the name of the CA who issued the certi cate, the time period within which the certi cate is valid, the serial number of the certi cate, and some additional information The CA signs all this data with a private key.

Obscuring involving constant names is rare:

>>> s = "\t no parking " >>> slstrip(), srstrip(), sstrip() ('no parking ', '\t no parking', 'no parking') >>> "<[unbracketed]>"strip("[](){}<>") 'unbracketed'

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One of the rst major uses for general-purpose directories was to replace the company phone book These listings of employees and their phone numbers are frequently reprinted but chronically out-of-date Maintaining a useful printed listing is a nontrivial task in a large company, where people frequently come and go, change locations, and change job titles The manual labor involved in compiling the listing, printing copies, and distributing the list to hundreds or thousands of employees is considerable In fact, by the time the listing is available, it may already be out-of-date! Now let s see how this setup might be replaced with an online directory We assume that all employees have access to a computer that is on a company network First we ll install a directory and add all the current employee names and phone numbers Most directories come with some kind of client software that allows users to search, view, and update directory information Once all employees have a copy of that software, they can use the directory to look up any phone number instantly If the directory is con gured to allow users to update their own information, a user can correct typos or provide new information without the assistance of any Information Systems or Human Resources personnel

Constant names cannot obscure method names, because they are distinguished syntactically 687 Local Variable and Parameter Names

We can also replace strings within strings using the strreplace() method This method takes two string arguments, and returns a copy of the string it is called on with every occurrence of the rst string replaced with the second If the second argument is an empty string the effect is to delete every occurrence of the rst string We will see examples of strreplace() and some other string methods in the csv2htmlpy example in the Examples section toward the end of the chapter One frequent requirement is to split a string into a list of strings For example, we might have a text le of data with one record per line and each record s elds separated by asterisks This can be done using the strsplit() method and passing in the string to split on as its rst argument, and optionally the maximum number of splits to make as the second argument If we don t specify the second argument, as many splits are made as possible Here is an example:

Local variable and parameter names should be short, yet meaningful They are often short sequences of lowercase letters that are not words For example: Acronyms, that is the rst letter of a series of words, as in cp for a variable holding a reference to a ColoredPoint Abbreviations, as in buf holding a pointer to a buffer of some kind Mnemonic terms, organized in some way to aid memory and understanding, typically by using a set of local variables with conventional names patterned after the names of parameters to widely used classes For example:

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