On Tue, 17 Sep 2013, Raimo Niskanen wrote:

> Suppose you are limited to length 1 strings of [a-z], then you have
> 29 possible strings.
> 
> Still. If you select one of those strings and calculates its SHA-1
> hash value. When you try any of the other 28 strings (or any other
> string of any lenght) and calculates this other strings SHA-1 hash
> value, the probability that it has the same hash value is 2 ^ (-160).

It seems likely that someone has calculated those hashes of 1 byte strings 
and determined that they have different hashes.  If so, then the 
probability of having the same hash value would be zero, not 2^(-160).

Eric

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