New cryptographic support on windows server 2008 OS

PPTP
Only 128-bit RC4 encryption algorithm is supported.


40 and 56-bit RC4 support is removed, but can be added (not recommended) by changing a registry key.



L2TP/IPsec
Data Encryption Standard (DES) encryption algorithm with Message Digest 5 (MD5) integrity check support is removed, but can be added (not recommended) by changing a registry key.

IKE Main Mode will support:

Advanced Encryption Standard (AES) 256 (new), AES 192 (new), AES 128 (new), and 3DES encryption algorithms.


Secure Hash Algorithm 1 (SHA1) integrity check algorithm.


Diffie-Hellman (DH) groups 19 (new) and 20 (new) for Main Mode negotiation.


IKE Quick Mode will support:

AES 256 (new), AES 192 (new), AES 128 (new), and 3DES encryption algorithms.


SHA1 integrity check algorithm.



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