Verify SSH host public key fingerprint
To check SSH host public key (Ed25519 key, MD5 checksum): ssh-keygen -l -E md5 -f /etc/ssh/ssh_host_ed25519_key.pub
Category: Security
Linux - disable TCP Offload for a network device
Use below command to disable TCP Offload for a network device: ethtool -K eth0 tx off Settings verification: ethtool --show-offload eth0 You can see results before (left) and after (right) making changes:
Check CPU Vulnerabilities under Linux - Spectre, Meltdown, L1TF
Check CPU Vulnerabilities under Linux cat /sys/devices/system/cpu/vulnerabilities/spectre_v2 cat /sys/devices/system/cpu/vulnerabilities/l1tf cat /sys/devices/system/cpu/vulnerabilities/spec_store_bypass cat /sys/devices/system/cpu/vulnerabilities/spectre_v1 cat /sys/devices/system/cpu/vulnerabilities/meltdown
Generate random bytes with openssl
Generate 32 bytes, hex encode: openssl rand -hex 32 Generate 32 bytes, base64 encode: openssl rand -base64 32 Generate 32 bytes, save output to file: openssl rand -out file.txt 32