"The only way to salt an existing hash is to recalculate the hash after a user logs in, or for the users to have all changed their passwords," Wisniewski said.
Silveira's comments about only a few hashed passwords being decoded and published are also puzzling, he said. "Why they believe only a small percentage have been solved is confusing. While only a small percentage have been published, most all of them have been discovered, according to many sources who have been trying to crack them," he said.
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