1 / 6

Brand-New Hash Function

Brand-New Hash Function. N BeeM A. Satoh. SHA-1 Broken!. Prof. Xiaoyun Wang. Essential Characteristics of Hash Function. Hash Function Algorithm that compresses an arbitrarily size of message into a fixed size hash value. It is also called a message digest function.

tranm
Download Presentation

Brand-New Hash Function

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Brand-New Hash Function NBeeM A. Satoh

  2. SHA-1 Broken! Prof. Xiaoyun Wang

  3. Essential Characteristics of Hash Function • Hash Function • Algorithm that compresses an arbitrarily size of message into a fixed size hash value. It is also called a message digest function. • Used for authentication, error detection, and pseudo-random number generators • One-Wayness • It is easy to generate the hash value from a given message, but it is computationally infeasible to generate a message producing a given hash value. • Collision Resistance • It is computationally infeasible to generate a message pair that has the same hash value.

  4. Birthday Attack • In a group of 40 people, a pair who have the same birthday can be found with 89% probability Birthday Paradox • When a hash value size is n bits, a collision can be found in 2n/2 messages with 50% probability

  5. Birthday Brand-New HashFunction Example Collision Resistance againstBirthdayAttack One-wayness is also satisfied

  6. Bye-Bye My Love

More Related