Re: Using a MAC in addition to symmetric encryption

2008-06-29 Thread Greg Rose
Erik Ostermueller wrote: If I exchange messages with a system and the messages are encrypted with a symmetric key, what further benefit would we get by using a MAC (Message Authentication Code) along with the message encryption? Being new to all this, using the encrytpion and MAC together seem

Re: Using a MAC in addition to symmetric encryption

2008-06-29 Thread Eric Rescorla
At Fri, 27 Jun 2008 07:52:59 -0700 (PDT), Erik Ostermueller wrote: If I exchange messages with a system and the messages are encrypted with a symmetric key, what further benefit would we get by using a MAC (Message Authentication Code) along with the message encryption? Being new to all this,

Re: Using a MAC in addition to symmetric encryption

2008-06-29 Thread Jonathan Katz
On Fri, 27 Jun 2008, Erik Ostermueller wrote: Hello all, If I exchange messages with a system and the messages are encrypted with a symmetric key, what further benefit would we get by using a MAC (Message Authentication Code) along with the message encryption? Being new to all this, using