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notes about hash security

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shockrahwow 2019-10-22 10:49:01 -07:00
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@ -24,3 +24,15 @@ In English: _Only inputs can find outputs, not the other way around._
* Two-way property/ Collision-free Property * Two-way property/ Collision-free Property
**2** identical data inputs will map to the same output **2** identical data inputs will map to the same output
## What does a hash provide?
* Integrity checks
* Message Digest / Authentication
_Hashes are not secure ffs_. When we say authentication we really mean that we are checking to ensure there has been no changes to the original message.
_NOTE:_ this really doesn't guarantee anything in communications susceptible to man-in-the-middle attacks.
Let's get real for minute: Think of it this way a message is like a car and the key is our hash. If the key doesn't fit in the slot then its not our car, **but** if we sent our car + key oversees whoever steals the car + key has full control and we lose security effectively. Using SSL is _kinda_ like putting that car + key combo in a box that nobody except the recipient can open.