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 [...]

For those interested in staying up to date and taking part in computer security and privacy, these are some active mailing lists that deal with it: Off The Record (Encryption for IRC and IM) This list is used for open discussion about Off-the-Record (OTR) Messaging software. Subscribe at: http://lists.cypherpunks.ca/mailman/listinfo/otr-users Archived mailing list: http://lists.cypherpunks.ca/pipermail/otr-users/ The or-talk [...]

For those of you comfortable on the command line, there’s an alternative way to password a file using the free utility OpenSSL. Say you want to password protect a tar archive of documents called unencrypted-data.tar. From the command line, type: $ openssl des3 -salt -in unencrypted-data.tar -out encrypted-data.tar.des3 enter des-ede3-cbc encryption password: Verifying – enter [...]

This tutorial shows how you can use GnuPG to secure and verify data on your Linux box but the first part is relevant for Windows users too.