Explain the meaning of Cryptography.
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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 stream cipher?
How do elliptic curve cryptosystems compare with other cryptosystems ?
What is a hash function? What is a message digest?
What other hash functions are there ?
What are interactive proofs and zero-knowledge proofs ?
What is the secure hash algorithm (sha and sha-1)?
What are rsa digital signatures?
What are covert channels ?
What are RC2 and RC4?
What is a compression function?
What is a PKI ?