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Security researchers have devised approaches that can find pairs of input strings that result in the same hash (Wang, Yin, and Yu 2005). As of the writing of this book, to find a collision against SHA-1, approximately 263 hash computations need to be performed. While the use of SHA-1 may continue to be secure for some applications (such as HMAC-SHA-1), it may be acceptable only in the very near future. The attacks against MD5 are more serious, and you should probably transition away from it immediately, if you have not done so already. Hash functions are widely used in the MAC and digital signature schemes that we described in this chapter. Since the attacks are collision attacks, not pre-image attacks, all is not lost. An attacker would not be able to use these attacks to fake an arbitrary digital signature on an existing document. However, an attacker that has access to lots of computational power may be able to use these attacks to construct two new documents that result in the same hash, obtain a digital signature on one of them, and claim that the other was signed. Nevertheless, the security landscape continues to change as new attacks are discovered from time to time, and we provide a section of our web site, www.learnsecurity.com/ntk, dedicated to keeping you up-to-date on the security of hash functions. As a result of some of these attacks, NIST has recommended that SHA-1 be phased out by 2010 in favor of newer variants of SHA, such as SHA-256 and SHA-512. SHA-256, like SHA-1, takes 512 bits of input, but produces 256 bits of output. SHA-512 takes 1024 bits of input and produces 512.

create(self): Saves the information submitted from new() and redirects to view() edit(self, id): Displays a form for editing the page id save(self, id): Saves the page id and redirects to view() list(self): Lists all pages delete(self, id): Deletes a page This structure forms a good basis for a large number of the cases you are likely to program with a relational database.

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status() != QTextStream::Ok ) return false; return true; } Most fonts today are not monospace, which means that the width of a character depends on the character; an i requires less space than an M Another problem is that most fonts are higher than they are wide The ASCII art image plugin does not take this into account, so even if a monospace font is used, the result appears to be stretched It s hard to compensate for this in the write method because you never know which font the user will use to view the image All in all, the results are not perfect, but you can still tell what the image shows..

view()

Figure 11-3. The source image alongside the resulting ASCII art Although writing is a straightforward process, reading is quite the opposite because you can never trust the input stream to be valid. It can contain anything, including something completely unexpected (corrupted data or a completely different file format, for example), or the file might be missing data. This means that the read method is more complex than the write method. In Listing 11-8 you can see how the header is read and validated. As with writing, it starts with a QTextStream being created. The first line is read, and you ensure that it equals TEXT. If it does not, the entire operation is aborted. The dimensions, which follow the first line, are matched and filtered out using a regular expression. If the expression fails to match, or if any of the dimensions fails to convert to a number, the operation is aborted. Now you know that the header is okay so you can start reading the image data.

While we mentioned SSL as early as in 1, we only now have covered all of the necessary background to explain how it works. SSL uses both symmetric and asymmetric cryptography, as well as signatures and MACs to provide authentication, confidentiality, and message integrity between a client and a server. We only provide a high-level summary of how SSL works here. In some parts of our explanation, we sacrifice pure technical accuracy for clarity of the explanation. For more details, see Eric Rescorla s SSL and TLS, and the SSL/TLS specification (Dierks and Rescorla 2006). In the remainder of this section, we use notation for protocol messages similar to that in the SSL/TLS specification. In the following discussion, we describe the steps required in a full SSL handshake. A handshake, in our context, is the set of steps that a client and server must execute in order to start exchanging sensitive application-level data. The goal of the handshake is for the client

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