Hashes have other uses as well. I pull data from a source database that has over 3 gigs of data in it and every hour the owners of that database flag all the rows as updated even if they weren't. I need to pick up just the changed rows, so I pull down the primary key and a hash of all of the rest of the fields (but not the changed flag) and compare it to what I have in my database. If the key matches and the hash doesn't then I pull down that row. I went from pulling down 3 gigs every hour to just a few hundred rows (< 1 meg).
Hashes have all sorts of uses! -----Original Message----- From: Dave Watts [mailto:dwa...@figleaf.com] Sent: Thursday, March 12, 2015 9:09 AM To: cf-talk Subject: Re: Decrypting MD5 > So basically MD5 is useless if you can't decrypt the value! That sucks. I don't know about useless. Hashing is not the same as encryption. They're intended to solve different problems. Let's say you're using a Windows network, with Active Directory. Active Directory doesn't actually know your password, because it doesn't need to know. All it needs to know is, did you enter the correct password when you hit Ctrl+Alt+Delete this morning - and it doesn't need to know what the password is in that case. Your workstation takes your plaintext password, generates a hash, and sends it to AD. AD compares the hash to the one it stored when you set your password in the first place. If they match, there's an extremely high likelihood that the plaintext passwords match as well. Dave Watts, CTO, Fig Leaf Software 1-202-527-9569 http://www.figleaf.com/ http://training.figleaf.com/ Fig Leaf Software is a Service-Disabled Veteran-Owned Small Business (SDVOSB) on GSA Schedule, and provides the highest caliber vendor- authorized instruction at our training centers, online, or onsite. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Order the Adobe Coldfusion Anthology now! http://www.amazon.com/Adobe-Coldfusion-Anthology/dp/1430272155/?tag=houseoffusion Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:360241 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/groups/cf-talk/unsubscribe.cfm
