For the general public, it's easy: Some cryptography (everything that uses SHA-1) has been broken and we need to move on to a better scheme. Luckily, we did th

For the general public, it's easy: Some cryptography (everything that uses SHA-1) has been broken and we need to move on to a better scheme. Luckily, we did this years ago because we suspected it could be broken. But unfortunately some people are still using the old stuff so if they haven't switched already they DEFINITELY need to switch now. If you are talking to the general public, the words 'hash', 'one-way', 'function', 'trapdoor', 'collision' should not appear in your statement.