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Clearly since SHA-1 hashing produces 40 characters each time, there is a finite number of possible hashes—does anyone know exactly how many?
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SHA-1 or Secure Hash Algorithm 1 is a cryptographic hash function which takes an input and produces a 160-bit (20-byte) hash value.
What does a SHA1 hash look like? The SHA1 algorithm generates a 160-bits message digest, represented as a 40 characters hexadecimal number. For example, “A94A8FE5CCB19BA61C4C0873D391E987982FBBD3” is a SHA1 hash.
The length of a SHA1 hash is 160 bits or 20 bytes. In this application it is represented by 40 characters in hexadecimal form.
SHA-1 Hash. SHA-1 or Secure Hash Algorithm 1 is a cryptographic hash function which takes an input and produces a 160-bit (20-byte) hash value. This hash value is known as a message digest. This message digest is usually then rendered as a hexadecimal number which is 40 digits long.
SHA-1 is prone to length extension attacks. In cryptography, SHA-1 ( Secure Hash Algorithm 1) is a cryptographically broken but still widely used hash function which takes an input and produces a 160- bit (20- byte) hash value known as a message digest – typically rendered as a hexadecimal number, 40 digits long.
This SHA-1 tool hashes a string into a message digested SHA-1 hash. This is a quick way for you to verify a hash you are working with is correct. If you are using salt, make sure to include that in the string. What is a SHA-1 Hash? SHA-1 (Secure Hash Algorithm) is a 160 bit cryptographic hash function created by the NSA in 1995.
SHA-1 produces 160-bit outputs, and it should be able to produce just about any sequence of 160 bits, There are 2 160 such sequences, i.e. close to 1461 billions of billions of billions of billions of billions. That's kind of big. However we have no proof that every single one of them is reachable.
SHA-1 hashes have 160 bits, so 2160 of them.
(2160 = 1461501637330902918203684832716283019655932542976 ~= 1.46 x 1048)
Note that since you have a much larger message space than possible hashes, collisions are bound to occur.
Also note that the probability of collision is much higher than you might think. At just 280 messages the probability of a collision is 50%, thanks to the Birthday paradox. (ie: with just 23 people the probability that 2 people have the same birthday is 50%).
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