encrypting MAC using RSA?

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stig - 19 Mar 2004 19:44 GMT

hi

if i have a MAC (message authentication code) created with
javax.crypto.Mac, is there some way of encrypting this MAC using a RSA
with a public key?

whats the difference beetween a digest and a MAC?
can i use the digest instead?

sun java SDK 1.4.2 is used.

/stig

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Michael Amling - 20 Mar 2004 03:20 GMT

> if i have a MAC (message authentication code) created with
> javax.crypto.Mac, is there some way of encrypting this MAC using a RSA
> with a public key?

Yes, but why would you want to?

> whats the difference beetween a digest and a MAC?
> can i use the digest instead?

A MAC is formed with a secret key. Only those who know the key can
form a valid MAC or verify an existing MAC. A digest is unkeyed.

--Mike Amling

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