Increase salt size


 
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# 1  
Increase salt size

Unix protect its password by using salt
It that mean larger the salt size the more secure?
if the salt size increase greatly, will the password still able to be cracked?

thank you for helping
# 2  
Not quite. In Unices, passwords are protected by hashing them, which means that they are sent through a cryptographic function which is (allegedly) impossible to revert. The salt has 2 functions in this:
  1. increase the time needed to brute-force the passwords (for each password there are 4096 different hashes (traditional crypt)
  2. avoid collisions if 2 users use the same password
Since the introduction of shadowed passwords and the MD5 scheme, the salt is 8 bytes large, with variable sized passwords, which makes it very infeasible to brute-force them. Newer implementations using the SHA1 family or Blowfish are even harder.
And any password is crackable given enough computing power and time... or social engineering.
 

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