blog dds

2007.08.28

The Treacherous Power of Extended Regular Expressions

I wanted to filter out lines containing the word "line" or a double quote from a 1GB file. This can be easily specified as an extended regular expression, but it turns out that I got more than I bargained for.

Continue reading "The Treacherous Power of Extended Regular Expressions"

2007.08.02

Location-Based Dictionary Attacks

I get daily security reports from the hosts I manage. Typically these contain invalid user attempts for users like guest, www, and root. (Although FreeBSD doesn't allow remote logins for root, I was surprised to find out that many Linux distributions allow them.)

Continue reading "Location-Based Dictionary Attacks"


Creative Commons License Last update: Wednesday, March 8, 2017 2:07 pm
Unless otherwise expressly stated, all original material on this page created by Diomidis Spinellis is licensed under a Creative Commons Attribution-Share Alike 3.0 Greece License.