Actionscript 3 :: Short "progress Code" Algorithm?
Apr 21, 2011
Does anyone have ideas to securely encode a small amount of data into approximately 8 characters? I have a project (Flash and Flex (AS3) not that it really matters) that must be deployed on CD/DVD-ROM (no local storage nor network access) but with a requirement to allow people to come back where they left off. Therefore there will need to be a code that is human-friendly to print (on dead-tree or PDF) or write down and to enter back into an input field, as well as being secure to stop cheating between different students.
There are 14 assessment items that can be completed in any order. At the moment I CRC32 their "login name" and take 16 bits from that result, and combine them with the 14 assessment bits into 30 bits that is then encoded using a form of Base32, giving 6 characters, then adding a check character, then using a character replacement for encryption. Upon return to the program and entering the 7 character progress code, after decryption and extraction, if there is a match in the name hash parts, it is assumed the completion bits are correct.
One problem identified was that only two characters change when completing each item. Is there some algorithm that would completely change the entire string if any one bit changes? Or is there a completely better way? I'd also like to store more data (dates, more bits for the hash to reduce collisions, location within the course, etc) but don't want to go above 8 or 10 characters.
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