AppSec Blog: Tag - encryption

ASP.NET Padding Oracle Vulnerability

A very serious vulnerability in ASP.NET was revealed this past month that allows attackers to completely compromise ASP.NET Forms Authentication, among other things. When things like this happen, as developersit's important to see what lessons can be learned in order to improve the defensibility of our software. Source: 'Padding Oracle' Crypto Attack Affects Millions of … Continue reading ASP.NET Padding Oracle Vulnerability


Top 25 Series - Rank 20 - Download of Code Without Integrity Check

Checking the integrity of code you download is important and has to be done not just for the initial download, but for updates as well. We will discuss the options to implement integrity checks correctly. Continue reading Top 25 Series - Rank 20 - Download of Code Without Integrity Check


Top 25 Series - Rank 24 - Use of a Broken or Risky Cryptographic Algorithm

There are a few rules every developer should follow when applying encryption: - don't invent your own algorithm Cryptography is a difficult topic, best left to the experts. Implementing encryption algorithms is difficult and there are many traps waiting. Many times, you can get away with a broken custom algorithm, but only because nobody challenges … Continue reading Top 25 Series - Rank 24 - Use of a Broken or Risky Cryptographic Algorithm


Argument for Database encryption in web apps

I regularly get consulted on various web application security issues and defensive strategies. One of the recent "frequently asked questions" is around database encryption of web application. My answers to these kind of questions usually lead to awkward looking faces. I always start off asking more questions about the requirements, "Who are you trying to … Continue reading Argument for Database encryption in web apps


How can I tell if my password is encrypted?

For most websites, we don't have the source code available. As a user, we more or less trust the site is doing "the right thing", or well, we just use a throw away password that we accept to be compromised. Sometimes, it is obvious. For example the site is sending you your password in the … Continue reading How can I tell if my password is encrypted?