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security software

FreeBSD Install gnupg Cryptographic Software

Q. How do I install gnugp security Cryptographic software on my FreeBSD 6.x server from a shell prompt over ssh session?
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Linux Password Cracking: Explain unshadow and john Commands ( John the Ripper Tool )

Can you tell me more about unshadow and john command line tools? How does it protect my server from crackers?
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