I am working on a bit of a issue and I am hoping to find some guidance. Here is what I need to to:
I need to generate 2 SHA1 hashes (easy) based on an objects name and it's DB id. This is Easy so far and I have that down. I get 2 unique SHA1 hashes stored. Now depending on what I am doing I only need X number of bits out of it. You see I am using the SHA1 hash as a unique pool of random bits I am parsing. I need the first 8 for what type of effect I am going to generate, the next 8 for how strong of an effect, and the next 8 for how long the effects go for. Now the question I have is how do I take a SHA1 hash and extract certain segments of bits out of it via perl? *** PART 2 *** I am not a cryptographer by any measure but I am trying to do something with unique content (can't get into details) where a user has their own SHA1 hash and objects have their own. What should I use to get a good pool of data by using the two together (think.. ummm.. parents having a kid!) Should I OR the bits, XOR the bits, or AND the bits? Lets assume that more then 1 object can be used. User 10110110...101010 Object 1 11101101...0000 Object 2 00100101....10010 etc.. I am leaning on XOR but I have to make sure that I have a good amount of variance in the mix. I am hoping that using SHA1 against object names and their DB id will prevent an all 0 and all 1 pool of bits. And with XOR against concurrent SHA1 I am hoping not to end up with all 0s and all 1s -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
