Who needs a key?
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How does the length of a hash value affect security?
What is RSAREF?
What is a digital time-stamping service?
What is a hash function ?
What is the GSS-API ?
What is blakleys secret sharing scheme?
What is quantum cryptography ?
What are micropayments ?
what is cryptography?
How is RSA used for authentication in practice?
What is a message digest?
How can signatures remain valid beyond the expiration dates of their keys, or, How do you verify a 20-year-old signature?