Fwknop
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↑ https://serverfault.com/a/608976
"FireWall KNock OPerator" implements an authorization scheme called Single Packet Authorization (SPA) (encrypted, non-replayed, with an HMAC SHA-256)
fwknop --key-gen
See also
- Port knocking,
fail2ban
[1]fwknop
, DenyHosts - OpenSSH (changelog):
/etc/ssh/sshd_config
|/etc/ssh/ssh_config
|~/.ssh/
|openSSL | sshd logs
|sftp
|scp
|authorized_keys
|ssh-keygen
|ssh-keyscan
|ssh-add
|ssh-agent
|ssh
|Ssh -O stop
|ssh-copy-id
|CheckHostIP
|UseKeychain
, OpenSSF iptables
ufw
firewalld
nftables
firewall-cmd
ipfw (FreeBSD)
PF (OpenBSD)
, netsh advfirewall- Security tools: Vulnerability scanner, port scan, Host sweep,
nmap
,nping
,ncat, nc
,psad
, Gordon Lyon - Port Knocking
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