I have previously mentioned Mixmaster ont his blog, a great software tool to send anonymous email and also used to post to Usenet groups anonymously, but visiting a website in order to send an anonymous email is not a good idea because your IP will be logged by the site server. You could use a [...]

Mixmaster is is an anonymous remailer software. It encrypts your email messages before sending them, it typically fires off the messages through a series of anonymous proxies, you can choose how many and what proxies you want on the chain, it also provides protection against traffic analysis by delaying the sending of the messages at [...]

This article is from 2007, I found it to be an excellent and detailed review of the most common tools that exist to encrypt data in Unix systems. These different tools and methods are still valid and in use nowadays. It provides some insights on encryption techniques, code quality, and the relative merits of the [...]

eCryptfs is a cryptographic filesystem embedded inside the Linux kernel (versions 2.6.19 and later), it is also a stacked filesystem, which means that eCryptfs is a layer that works on top of other standard, lower file systems, such as ext4, FAT32, XFS and ReiserFS. Some of the great advantadges of eCryptfs over other encryption methods [...]

This tutorial shows how you can use GnuPG to secure and verify data on your Linux box.