LeakedSource commented about the password sasying,
"Passwords were stored in SHA1 with no salting. This is not what internet standards propose. Only 117m accounts have passwords and we suspect the remaining users registered using Facebook or some similarity."
Additionally, security researcher Troy Hunt Tweeted that as the passwords are encrypted with SHA-1, it will be easily cracked.
Things about the LinkedIn breach:— Troy Hunt (@troyhunt) May 18, 2016
- Dates to 2012
- SHA1 with no salt (I believe it's changed since)
- Weak passwords will be easily cracked