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The wrong method: Double Hashing & Wacky Hash Attributes

Juin 04, 22
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The wrong method: Double Hashing & Wacky Hash Attributes

A familiar error is to apply an identical salt inside for every single hash. Sometimes the brand new salt is difficult-coded into the system, or is produced randomly immediately following. This really is useless as if a few profiles have a similar code, they have an equivalent hash. An attacker can invariably have fun with a face-to-face browse table assault in order to focus on good dictionary attack on every hash meanwhile. They just need certainly to implement the fresh new sodium to every password suppose in advance of they hash it. When your salt is hard-coded to your a famous unit, look dining tables and you may rainbow dining tables are built for one sodium, making it better to split hashes made by the product.

Small Sodium

Should your salt is too quick, an assailant is build a lookup table per you are able to sodium. Including, if your sodium is just three ASCII characters, there are just 95x95x95 = 857,375 you can salts. That can appear to be a lot, however if per browse dining table contains just 1MB of the very most preferred passwords, along they shall be just 837GB, that isn’t a lot given 1000GB hard disks shall be purchased at under $100 now.

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