LinkedIn spent between $500,000 and $1 million on forensic work after a large number of passwords were breached. CFO Steve Sordello said the 175-million-member company continued to strengthen its website’s security and is expected to add $2 million to $3 million in costs in the current quarter. The stolen passwords were camouflaged using an outdated cryptographic hash function, SHA-1, created by the National Security Agency. LinkedIn failed to add additional security layers such as salting the passwords, a technique which randomly appends a string of characters.
Source: https://thehackernews.com/2012/08/linkedin-data-breach-costs-1-million.html