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Feb
10
accepted Why is Diffie-Hellman considered in the context of public key cryptography?
Feb
10
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Feb
10
comment Why is Diffie-Hellman considered in the context of public key cryptography?
OK - that is where the confusion lies - DH is usually discussed in the realm of public key cryptography while used in the realm of symmetric key cryptography. Duh
Feb
10
comment Why is Diffie-Hellman considered in the context of public key cryptography?
Thanks - if we do apply we end up with a symmetric key - no ? So in this case DH is used to create and exchange the symmetric keys - or is never used like this ?
Feb
10
comment Why is Diffie-Hellman considered in the context of public key cryptography?
Hmm - thanks. The symmetric key K = f((g^x)^y) part made me think that DF may be discussed in the realm of symmetric cryptography (I know it is not a cipher) - but your explanation clarifies why it is considered public key. See also the wikipedia article : Once Alice and Bob compute the shared secret they can use it as an encryption key, known only to them, for sending messages across the same open communications channel. Looks like symmetric - no ? Could be s (g^(xy)) be used as the key in AES for instance ?
Feb
10
asked Why is Diffie-Hellman considered in the context of public key cryptography?