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ScanSSH supports scanning a list of addresses and networks for open proxies, SSH protocol servers, Web and SMTP servers. Where possible ScanSSH, displays the version number of the running services. ScanSSH protocol scanner supports random selection of IP addresses from large network ranges and is useful for gathering statistics on the deployment of SSH protocol servers in a company or the Internet as whole.

The scrypt key derivation function was originally developed for use in the Tarsnap online backup system and is designed to be far more secure against hardware brute-force attacks than alternative functions such as PBKDF2 or bcrypt.

Seahorse is a Gnome front end for GnuPG - the Gnu Privacy Guard program. It is a tool for secure communications and data storage. Data encryption and digital signature creation can easily be performed through a GUI and Key Management operations can easily be carried out through an intuitive interface.

SecPanel serves as a GUI for managing and running SSH (Secure Shell) and SCP (Secure Copy) connections. Nearly all connection-parameters are adjusted by one mouseclick (compression, port-forwarding, etc.). It also manages the SSH-agent.

This is the sectok tool from citi.umich.edu. Originally targeted for OpenBSD. This is a quick port of the basic application; it relies upon the libsectok library for ISO 7816 Smart Card device communication.

This program implements a standard PGP Key Server, which can be assumed to be in addition to the public key server at MIT.

sig2dot can be used to generate a graph of all of the signature relationships in a GPG/PGP keyring. It converts the output of "gpg --list-sigs" to a .dot file, which is a graph definition that can be rendered by springgraph or graphviz.

The Open Vulnerability Assessment System (OpenVAS) is a framework of several services and tools offering a comprehensive and powerful vulnerability scanning and vulnerability management solution. This package contains core libraries.

signing-party is a collection for all kinds of PGP/GnuPG related things, including signing scripts, party preparation scripts, etc. * caff: CA - Fire and Forget signs and mails a key * pgp-clean: removes all non-self signatures from key * pgp-fixkey: removes broken packets from keys * gpg-mailkeys: simply mail out a signed key to its owner * gpg-key2ps: generate PostScript file with fingerprint paper strips * gpglist: show who signed which of your UIDs * gpgsigs: annotates list of GnuPG keys with already done signatures * keylookup: ncurses wrapper around gpg --search