Correlating Log files are an important aspect when responding to incidents/attacks/outages regarding your Cisco devices.
However I have noticed for a while that my logging timestamps are off an hour from the actual clock synced by NTP.
After some digging I realized that Cisco devices use service timestamps log datetime
as a default. You can check the default values using the command: sh run all | inc timestamp
In order for your logs to use the local clock time you need to issue the command device(config)# service timestamp log datetime localtime
From now on, your logging timestamp should be identical to your local time on the device.
Crypto 101 started as a presentation at PyCon 2013. It tries to go through all of the major dramatis personae of cryptography to make TLS work in 45 minutes. This book is the natural extension of that, with an extensive focus on breaking cryptography.
Internet censorship is bad – especially when it is abused to censor media reports about potentially corrupt government officials. Luckily a lot of incompetent people try to implement censorship via DNS.
Censorship via DNS is a method which is pretty easy to bypass and some people have responded to this this: