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MPPE-128 encryption (which uses RC4 encryption with a 128bit key) MS-CHAPv2 authentication (which uses SHA-1) strong passwords (minimum 128 bits of entropy) I realize that RC4 and SHA-1 have weaknesses, but I am interested in practical impact. Are there known attacks or exploits that would succeed against a PPTP VPN with the above configuration?
6 de oct. de 2020 · MS-MPPE-Recv-Key; See the StrongSwan wiki on this topic: For EAP methods providing an MSK, the RADIUS server must include the key within the MPPE-Send/Receive Keys [...] See this Security StackExchange answer on this topic. See RFC5216: Enc-RECV-Key = MSK(0,31) = Peer to Authenticator Encryption Key (MS-MPPE-Recv-Key in [RFC2548]).
20 de oct. de 2020 · IEEE 802.1X-2010 states: "Generate an MSK of at least 64 octets, as required by IETF RFC 3748 [B14] Section 7.10, of which the first 16 or 32 octets are used by this standard as described in 6.2.2." RFC3748 states: "EAP method supporting key derivation MUST export a Master Session Key (MSK) of at least 64 octets".
10 de may. de 2013 · I am trying to get the MS-MPPE-Send-key and MS-MPPE-Recv-key from the MS-CHAPv2 challenge material. I am able to follow the RFCs 2548 3078 and 3079 to the step of getting the GetNewKeyFromSHA() it is 16 bytes long. I can use the key to encrypt data as the example in 3079.
8 de mar. de 2017 · I'm in the process of implementing 802.1x WPA2 Enterprise Authentication using FreeRadius and EAP-TLS (Mutual TLS Cert Based Auth). I am keen to understand how to actual protocols work together and how they keep our WiFi network safe. I understand the basics of Cert-based auth, using pub/priv keys. I also know that in regular HTTPS, a session ...
The encryption, MPPE, uses RC4. But, there is no message authentication, so it is possible for an attacker to modify your traffic in transit, quite possibly without it being detected. And RC4 is getting weaker by the day (which is a whole other topic)... Microsoft, for their part, recommend using L2TP or IPSec or SSTP.
5 de dic. de 2014 · The IPsec stack does not create it's own keys, or request any keys for that matter, instead the IKE daemon generates as much key material as required for the negotiated encryption and authentication algorithms using the PRF+ (which can basically return an arbitrary amount of key material).
1 de abr. de 2020 · RADIUS packet matching with station MS-MPPE-Send-Key (sign) - hexdump(len=32): 10 02 c1 45 3f cd ea a0 29 35 17 86 3e fc 00 50 2d 6a 16 4c e5 85 b2 a0 fd 95 a5 b2 d2 ea b4 33 MS-MPPE-Recv-Key (crypt) - hexdump(len=32): 5a a5 09 23 0d ce e0 f0 b4 8a bb be d7 ff 6a e7 2b 8a 6f be 84 9d 64 07 88 d7 7d 7c a1 02 07 63 decapsulated EAP packet (code=3 ...
26 de dic. de 2017 · MPPE (Microsoft Point-to-Point Encryption- 微软 点对点加密术）协议是由Microsoft设计的，它规定了如何在 数据链路层 对通信机密性保护的机制。. 它通过对PPP链接中PPP分组的加密以及PPP封装处理，实现数据链路层的机密性保护。. MPPE包传输前，PPP必须已经进入网络层协议 ...
13 de mar. de 2015 · L2TP should always obviously be used with IPSec because L2TP doesn't actually feature any encryption if you run it as a standalone, which is why you will mostly see it paired with IPSec. IPSec tends to be pretty secure. Below is a list of the Cryptographic algorithms it uses: Confidentiality: 3DES-CBC it can also use AES-CBC and AES-GCM.
