Communications
GnuPG (The GNU Privacy Guard)
GPG is a powerful alternative to PGP from NAI Labs. Like PGP, GPG encrypts/decrypts mail or data with a mix of symmetric and asymmetric encryption. GPG is widely used by CSIRTS around the world to communicate confidential/sensitive data. GPG is a command-line tool, some graphical user interfaces and plugins for mailprograms exist. The program is sponsored by german gouvernment.
Listserv
Listserv is a commercial mailing list package that can be used to maintain distribution lists for incident response teams.
PGP (Pretty Good Privacy)
PGP, developed by Phil Zimmerman, is used to encrypt/decrypt mail or files with a mix of symmetric and asymmetric encryption. PGP is widely used by CSIRTs around the world to communicate confidential/sensitive data. The official PGP program was purchased by NAI Labs, who have recently stopped supporting the program. PGP will be further developed by pgp.com, version 9.x ist available and looks promising. A free version of older PGPiversions is available at the link below.
