172 Chapter7·TheSSHServerBasics Frequently Asked Questions Q: What RFC's apply to SSH server? A: IETF RFC's 4250, 4251, 4252, 4253, and 4254 (see Chapter 4 for more details). Q: What is the most popular SSH server available today? A: OpenSSH (from the OpenSSH Group http://www.openssh.org) is the most popular in use today. Q: How strong are the encryption algorithms in use today? A: 3DES and AES can use up to a 256-bit key. These algorithms are industry standards and are currently susceptible to breach. Q: Where can I learn more about these encryption standards? A: Cryptography for Developers, published by Syngress Publishers in 2006, will help you understand the cryptography standards in use, both in SSH and in other security protocols. Q: Are there packages of SSH server that I don't have to compile myself?