What command will correctly reformat the Unix passwordcopy and shadowcopy Tiles for input to John The Ripper?

The correct answer is C. /Unshadow shadowcopy passwdcopy >john file. The marked answer C appears to be incorrect. The standard unshadow syntax is: unshadow <passwd-file> <shadow-file> > <output-file> - the passwd file (passwdcopy) must come FIRST, followed by the shadow file (shadowcopy). Answer C reverses this order (shadowcopy before passwdcopy)

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Question

Options

A/Un shadow passwd copy shadowcopy > johnfile
B/Unshadow passwdcopy shadowcopy > johnfile
C/Unshadow shadowcopy passwdcopy >john file
D/Unshadow passwdcopy shadowcopy > johnfile

How the community answered

(61 responses)

A
13% (8)
B
3% (2)
C
79% (48)
D
5% (3)

Explanation

The marked answer C appears to be incorrect. The standard unshadow syntax is: unshadow <passwd-file> <shadow-file> > <output-file> - the passwd file (passwdcopy) must come FIRST, followed by the shadow file (shadowcopy). Answer C reverses this order (shadowcopy before passwdcopy) and introduces a space in 'john file', both of which are errors. Answers B and D both show the correct argument order (/Unshadow passwdcopy shadowcopy > johnfile). The unshadow utility merges the two files so John the Ripper can match hashed passwords in /etc/shadow with usernames and metadata in /etc/passwd for dictionary or brute-force cracking.

Topics

#John the Ripper#unshadow#Unix passwords#password cracking

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