At what point does an attack become practical ?
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How can signatures remain valid beyond the expiration dates of their keys, or, How do you verify a 20-year-old signature?
What is a hash function? What is a message digest?
What is Mondex ?
What is a linear feedback shift register?
What is SecurID ?
Which is easier, factoring or discrete log?
How are certificates used?
What if the certifying authority's key is lost or compromised?
What is blowfish?
How is RSA used for encryption in practice?
What is the current status of DSS?
Who are the escrow agencies?