peterh – WindowsTechs.com

Why openssl verify does not work for the certificate chain of a correctly configured site?

Posted on January 10, 2024 by peterh

I download its certificates. To do that, I used the openssl debug output of the command
openssl s_client -connect security.stackexchange.com:443 -servername security.stackexchange.com -showcerts -debug </dev/null 2>&1|tee out

Th… Continue reading Why openssl verify does not work for the certificate chain of a correctly configured site?→

Does a searchable public database exist of (hostname; ip) mappings?

Posted on October 13, 2019 by peterh

This question is not about the trivial usage of the forward/reverse DNS.

Getting the IP of a hostname is trivial (DNS), and using reverse DNS, also we can get (typically) a single hostname of an IP.

However, particularly for massive http… Continue reading Does a searchable public database exist of (hostname; ip) mappings?→

Is it possible to prevent unauthorized copying or recording of data by photographing screens?

Posted on September 12, 2015 by peterh

I am thinking on a way which would prevent unauthorized copying or recording of data by photographing screens.

I also think, if the content of a screen is understable for an eye of a living human, it is also photographable by any mobile.
… Continue reading Is it possible to prevent unauthorized copying or recording of data by photographing screens?→