Crypt::IDA is a Perl module that implements Rabin's Information Dispersal Algorithm. This is what's known as a "threshold system": a secret is divided into n shares with the property that any k (the "quorum" or "threshold") of those shares (with k <= n) can be combined at a later time to reconstruct the secret. The algorithm should be cryptographically secure in the sense that if fewer shares than the quorum k are presented, no information about the secret is revealed. The module uses Math::FastGF2 to efficiently implement the algorithm, making it suitable for securely sharing and distributing even large files. The Crypt::IDA::ShareFile module implements a file format for creating, storing, and distributing shares created with Crypt::IDA.
Although widely used, currently popular peer-to-peer (P2P) applications offer no user privacy. By design, services like BitTorrent and Gnutella share data with anyone that asks for it, allowing a third-party to systematically monitor user behavior. As a result, using a P2P network means that your online activities become public knowledge. OneSwarm is a peer-to-peer tool that provides users with explicit control over their privacy by letting them determine how data is shared. Instead of sharing data indiscriminately, data shared with OneSwarm can be made public, shared with friends, shared with some friends but not others, and so forth.
P6P is a decentralized public virtual network designed for traversing NAT. It's useful mainly for peer-to-peer applications that don't implement NAT traversal themselves. It uses an unrouted segment of IPv6 (Unique-local), so it doesn't collide with other networks. It does not implement any additional security.
SFTP Applet is a JFileUpload add-on that adds SSH File Transfer Protocol support to all JFileUpload applets. It works with basic JFileUpload and all other derived products such as JDiskExplorer, JBatchUpload, JImageFilter, and JImageUpload. It supports SSH2, SFTP versions 0, 1, 2, and 3, resuming, and file management commands.