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Category: Security

Verify SSH host public key fingerprint

Published on 2020-03-11 Author admin

To check SSH host public key (Ed25519 key, MD5 checksum): ssh-keygen -l -E md5 -f /etc/ssh/ssh_host_ed25519_key.pub

Categories CentOS, Cryptography, Fedora, Linux, Security

Linux - disable TCP Offload for a network device

Published on 2019-10-16 Author admin

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:

Categories CentOS, Fedora, Linux, Networking, Security

Check CPU Vulnerabilities under Linux - Spectre, Meltdown, L1TF

Published on 2018-08-17 Author admin

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

Categories CentOS, Fedora, Linux, Security

Generate random bytes with openssl

Published on 2018-08-07 Author admin

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

Categories Cryptography, Linux, Security

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