However, as I discussed, while 10 million combinations is high for an online attack, it is well within the range of offline attacks, particularly if GPU enhanced.   This means that instead of 1 billion options per second, there are only 10 million possible options, but this is still at the high end of reasonable for most web-based attackers. As previously mentioned, the RFC doesn't actually require true nanosecond accuracy, instead it specifies 100 nanosecond intervals. We see that Python has historically, and continues to, correctly leverage nanosecond level accuracy. To validate this, we can look at the python UUID code. In reality, this appears limited to NodeJS implementations (classic). The major issue pointed out in the original blog post was that some implementations don't use the RFC specified 100 nanosecond intervals, instead using milliseconds. Given the small search space of the sequence factor (only ~16000 combos) the only real variability is introduced by the timestamp and MAC address. UUIDv1 draws its search space from a timestamp, a 14-bit random sequence factor, and a MAC address. This week we take a more in-depth gander at how Python decides which MAC address to use for UUIDv1/v2 as this is a key part of the 'security' of UUID. It's been a few weeks since I expanded the work on UUIDv1 security from a previous blog. I’ve decided to keep a record of my adventures. If you provide incorrect password, the command would fail with the error message “ Logon failure: unknown user name or bad password.Every week, almost without fail, I come across one thing that confuses, entertains, or most commonly infuriates me. If you try this for a Linux machine you would get the error “ The RPC server is unavailable.” Using getmac command we can retrieve the mac addresses of the machines running windows OS only.  You will be prompted to enter the password and the command execution will take place after that. If you do not want to specify the password, you can skip /p parameter.  Just run the command getmac to get the mac addresses. It works on XP, Vista, Windows 7, Server 2003 and Server 2008 operating systems. Below are few examples on how to use this command. This can be used to get mac address for remote computers also. We can find mac address (physical address) of a computer using the command ‘ getmac‘.

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