what is probability to create two equal hashes for md5 algorithm

Hi *

I have a question. There is few doesns of __terabytes__ of data. I need
to split this data to blocks of fixed size. Than I need to calculate a
sha1 hash for each block and store it. The question is which minimal
size of block I have to choose to minimize the probability of existence
of two equal hashes? What probability of such a coincidence would be if
I'll use an md5, crc32 or sha2 algorithms instead of sha1? Or if I'll
use a combination of this algorithms (e.g. sha1 and crc32 or sha2 and
md5 and crc32)?

Thanks in advance.

.

Relevant Pages

  • Re: what is probability to create two equal hashes for md5 algorithm
    ... sha1 hash for each block and store it. ... size of block I have to choose to minimize the probability of existence ... won't have any collisions unless the data has been specially constructed to produce a collision. ...
    (sci.crypt)
  • Re: what is probability to create two equal hashes for md5 algorithm
    ... sha1 hash for each block and store it. ... size of block I have to choose to minimize the probability of existence ... Unless the block size is less than 16 bytes do not worry about collisions. ...
    (sci.crypt)
  • Re: Grocery Shopping, buy 3 items @ 2 stores
    ... Given that I will purchase three needed items from one store and then ... another three needed items from another store, what is the probability ... 100 of them could sum to $9.92. ...
    (sci.stat.math)
  • Re: Need Matlab help pls,
    ... probability of been in the bad state is 0.96. ... Now i need to create an array to store the values of the simulation ... The inside of the while- or for-loop can be made simpler and you ...
    (comp.soft-sys.matlab)
  • Re: Grocery Shopping, buy 3 items @ 2 stores
    ... say there were 500 possible items in each store. ... Given that I will purchase three needed items from one store and then ... another three needed items from another store, what is the probability ... 100 of them could sum to $9.92. ...
    (sci.stat.math)
Quantcast