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Passwords that are short or based on dictionary words (in any language) are easy for hackers to crack Here s how it works The computer that controls your ability to log onto the network stores its passwords in an scrambled file It s usually impossible to unscramble the file by brute force, but hackers have a better technique They ve used the same scrambling system to scramble every word in the dictionary, most common phrases, and all the numbers five to six digits in length They compare their scrambled passwords to the password file For example, the word happy might get scrambled to Oxdxx8ffa If the hackers see 0sdxx8ffa in the password file, they know the user s password is happy This technique makes it easy for hackers to reverse engineer bad passwords without actually breaking the scrambling system used on the password file With even a small amount of users, a hacker is nearly guaranteed to get a few passwords, unless the system administrator implements a system that prevents users from choosing bad passwords

Strong authentication which is defined as a password or passphrase that uses a combination of letters (one of which, at a minimum, should be uppercase), numbers, special characters, and a space is now the industry standard; however, trying to use that same standard on a mobile keyboard is difficult, if not impossible The need to uphold strong authentication requirements is imperative, especially if the access is to sensitive data (such as one s bank account); however, enforcing those standards on a mobile keyboard makes even the most paranoid security professional rethink their password strategy

C strings are arrays They are arrays of the char data type You can define a character array as an actual array or as a pointer to an implicit array, the second of which is usually referred to as a C string

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char firstname[] = {'J', 'A', 'M', 'E', 'S','\0'}; char * lastname = "BRANNAN"; printf("Name:%s %s\n",firstname,lastname);

Traditional client operating systems support multiple users; however, their architectures grant each user a different operating environment For example, a desktop operating system will require a separate username/password for each user logging into the machine, thus ensuring the data from one account is not readily available to the other On a mobile device, the world is different There is no such thing as logging into a mobile device as a separate user (not yet anyway) After entering a four-digit PIN, the user is logged into the system In this situation, if one application is used purely for business purposes, and the others are personal applications for the family to use, there is no distinction from one application to the next Each application might need a different security model so the data from one does get exposed to the other; however, because there is one user profile, the device may or may not to be able to support the distinction

Passwords tend to be most effective when they re unique to the individual, difficult to guess, and used in conjunction with other authentication techniques In our spy scene, the hero would have been thwarted if each henchman were recognized by the doorman (biometrics) and had his or her own password (Of course, this never happens because few movie-goers will believe that a burly, evil doorman can remember hundreds of passwords) Let s look at some of the issues with passwords a little more closely

The first line defines a character array Each letter is an element in the array of six elements Note the null terminating character, \0 Character arrays that are to be used as character strings must end with a terminating null character The second line uses a common shortcut by simply declaring a pointer to an array created with the BRANNAN characters Behind the scenes, the compiler creates a character array from the string and then assigns the pointer to the array s first element s address For instance, the following code performs the same steps as the preceding code, only manually:

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