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The basic idea of encrypted passwords is simple: rather than storing a raw password in the database (known as cleartext ), we store a string generated using a cryptographic hash function, which is essentially irreversible, so that even an attacker in possession of the hashed password will be unable to infer the original To verify that a submitted password matches the user s password, we first encrypt the submitted string and then compare the hashes Let s drop into a console session to see how this works:

CanFrame() CanFrame(int ID, boolean extendedID, byte[] buf, int length) data extendedID getData() getExtendedID() getID() getLength() getMessageCenter() getRemoteFrameRequest() ID length messageCenter remoteFrameRequest setData(byte[] buf) setExtendedID(boolean extendedID) setID(int ID) setLength(int length) setMessageCenter(int MC) setRemoteFrameRequest(boolean RTR)

$ rails console >> require 'digest' >> def secure_hash(string) >> Digest::SHA2hexdigest(string) >> end => nil >> password = "secret" => "secret" >> encrypted_password = secure_hash(password) => "2bb80d537b1da3e38bd30361aa855686bde0eacd7162fef6a25fe97bf527a25b" >> submitted_password = "secret" => "secret" >> encrypted_password == secure_hash(submitted_password) => true

Here we ve defined a function called secure_hash that uses a cryptographic hash function called SHA2, part of the SHA family of hash functions, which we include into Ruby through the digest library7 It s not important to know exactly how these hash functions work; for our purposes what s important is that they are one-way: there is no computationally tractable way to discover that

bcdToInt(int bcdVal) calculateDayOfWeek(int month, int date, int fullYear) Clock() get12Hour() getDate() getDay()

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is the SHA2 hash of the string "secret" If you think about it, though, we still have a problem: if an attacker ever got hold of the hashed passwords, he would still have a chance at discovering the originals For example, he could guess that we used SHA2, and so write a program to compare a given hash to the hashed values of potential passwords:

A problem with these types of sessions is that the participants often bring with them their own preconceived notions of what "the system" should do It's incredibly difficult to get the participants to step back from these ideas and think about the actual requirements in a more abstract form One tactic I've used with some success is to structure the conversation in the form of scenarios or "user stories" These aren't the same as "use cases," which we'll get to later (see the sidebar, Formal Use Case Analysis with Unified Modeling Language (UML), later in this chapter) They're broad-brush narrative form, "day-in-the-life" stories about how people actually conduct their lives If these stories are used correctly, the rest of the requirements flow easily from them First, it's important to understand who your users are In the case of this "movie review" content management, we're talking mostly about the people involved in the production of the reviews, but we also have to talk about the users of the site the end users who eventually will read these reviews If we don't include them in our user scenarios, it's going to be difficult to figure out what information needs to be captured by our content management system In the real world, companies have vast storehouses of demographic data on their customers, but they often don't put this data to work for them during the software development process Because we are talking about two groups of users (internal and external), I recommend doing two sessions: one to determine the end-user requirements and the second to delve further into the content management and workflow requirements of the review writers You should do your end-user oriented (customer-oriented) scenarios first, before doing internal user scenarios This might seem obvious, but it's amazing how many organizations make the simple mistake of considering their internal users before their.

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>> >> => >> => >> => hash = "2bb80d537b1da3e38bd30361aa855686bde0eacd7162fef6a25fe97bf527a25b" secure_hash("secede") == hash false secure_hash("second") == hash false secure_hash("secret") == hash true

7 In my setup, the require digest line is unnecessary, but several readers have reported getting a NameError exception if they don t include it explicitly It does no harm in any case, so I ve included the explicit require just to be safe

getHour() getHundredth() getMinute() getMonth() getPm() getRTC() getSecond() getTickCount() getYear() intToBCD(int intVal) set12Hour(boolean is12Hour) setDate(int date) setDay(int day) setHour(int hour) setHundredth(int hundredth) setMinute(int minute) setMonth(int month) setPm(boolean pm) setRTC() setSecond(int second) setTickCount(long millis) setYear(int year)

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