Courtesy of tptacek, https://news.ycombinator.com/item?id=5776044 https://news.ycombinator.com/item?id=5776044 "Most are vulnerable to length extension attacks

Courtesy of tptacek, https://news.ycombinator.com/item?id=5776044 https://news.ycombinator.com/item?id=5776044 "Most are vulnerable to length extension attacks. SHA3 (Ketchup) is not vulnerable to length extension attacks, because resistance to length extension was a design criteria for the SHA3 contest."