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sudo apt update
sudo apt upgrade

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# Çå¿ÕÒÑÓйæÔò
sudo iptables -F
sudo iptables -X
sudo iptables -Z

# ÔÊÐíÏà¹ØÅþÁ¬
sudo iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

# ÔÊÐíÍâµØ»Ø»·
sudo iptables -A INPUT -i lo -j ACCEPT
sudo iptables -A OUTPUT -o lo -j ACCEPT

# ÔÊÐí³£ÓÃЧÀÍ
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT   # ÔÊÐíSSH
sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT   # ÔÊÐíHTTP
sudo iptables -A INPUT -p tcp --dport 443 -j ACCEPT  # ÔÊÐíHTTPS

# ¾Ü¾øÆäËüÅþÁ¬
sudo iptables -A INPUT -j DROP
sudo iptables -A OUTPUT -j DROP

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# ¸ü¸ÄÃÜÂëÓÐÓÃÆÚΪ90Ìì
sudo sed -i 's/PASS_MAX_DAYS    99999/PASS_MAX_DAYS    90/g' /etc/login.defs

# ÉèÖÃÃÜÂë×î¶Ì³¤¶ÈΪ8
sudo sed -i 's/PASS_MIN_LEN    5/PASS_MIN_LEN    8/g' /etc/login.defs

# ÉèÖÃ×î´óʧ°ÜµÇ¼´ÎÊýΪ5´Î
sudo sed -i 's/LOGIN_RETRIES    5/LOGIN_RETRIES    5/g' /etc/login.defs

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# ÌìÉúÃÜÔ¿¶Ô
gpg --gen-key

# ¼ÓÃÜÎĵµ
gpg -e -r recipient@example.com document.txt

# ½âÃÜÎĵµ
gpg -d document.txt.gpg > decrypted_document.txt

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