[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\Schannel\Ciphers\AES 128\128} GCM cipher mode encryption,and then completely remove CBC mode ciphers from group policy and allow only GCM mode ciphers, and Enable only TLS 1.2 Protocol. should probably return to his/her pen testers to discuss whether their specific use of CBC modes may be acceptable for a while longer until GCM is better adopted, before testing any adjustements to the Functions list.įor this you need to add high strength cipher like AES 128/128 and AES 256/256 to allow Of the specific information and not an approach like CBC is "bad" GCM is "good". A balanced approach for information assurance is needed depending on the categorization AES-GCM are still not completely widespread (March 2016) in all clients/browsers and OS versions.Īs with much of crypto, what might be appropriate for state top-secrets and what might be appropriate for information of very low confidentiality won't always be the same. Supportįor modern modes of block cipher operation such as e.g. Adjusting this list must be done with great care as misconfiguration will prevent sucesful connections. Removal of CBC modes of operation from the list would prevent their sucesful negociation, but removal of all CBC is likely to have negative impact.
HKLM\System\CurrentControlSet\Control\Cryptography\Configuration\Local\SSL\00010002 Functions This controls the preferred order and what is acceptable when the transport security is negotiatedīetween server/webserver and client/browser. In order to direct how the transport security is negotiated in this more granular level, they will also need to look at the content and ordering of the Functions list. This is not fully covered in that answer.
#Microsoft access for mac 2008 how to#
The linked article is a very good description for how to enable and disable cipher suites like SSL 2.0 etc, but SH's pen test comments posted are also concerned about the mode of operation of the ciphers used - specifically about removing the use of CBC (Cipherīlock Chaining) and using Counter (CTR) or Galois Counter (GCM). While not "incorrect" Steven's answer is incomplete.
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