every day--'

  `I'VE been to a day-school, too,' said Alice; `you needn't be
so proud as all that.'

  `With extras?' asked the Mock Turtle a little anxiously.

  `Yes,' said Alice, `we learned French and music.'

  `And washing?' said the Mock Turtle.

  `Certainly not!' said Alice indignantly.

  `Ah! then yours wasn't a really good school,' said the Mock

 *       code, or even to discover <i>any</i> two distinct inputs that yield the same result. These
 *       are called <i>cryptographic hash functions</i>. But, whenever it is learned that either of
 *       these feats has become computationally feasible, the function is deemed "broken" and should
 *       no longer be used for secure purposes. (This is the likely eventual fate of <i>all</i>

every day--'

  `I'VE been to a day-school, too,' said Alice; `you needn't be
so proud as all that.'

  `With extras?' asked the Mock Turtle a little anxiously.

  `Yes,' said Alice, `we learned French and music.'

  `And washing?' said the Mock Turtle.

  `Certainly not!' said Alice indignantly.

  `Ah! then yours wasn't a really good school,' said the Mock