APC NBRK0320E Datasheet download pdf (Page 208)

Using Your Appliance 199

Verifying Signed M-JPEG AVI Files

NetBotz has included a simple command line utility that enables you to verify that digitally signed

M-JPEG files have not been tampered with since they were generated by your NetBotz appliance.

This command line utility, AVIVRFY.BAT, is automatically installed along with the Advanced View

and can be accessed from the Advanced View installation directory.

To use this utility, open a command line session and change directories to the Advanced View

installation directory. Then, type at the command line

avivrfy avifilename.avi

where avifilename.avi is the filename of the AVI file that you want to verify, and then press Enter.

Output Examples

Here is an example of the output that AVIVRFY.BAT generates when used on a valid signed AVI file:

sample.avi is valid

Appliance Serial: 00:02:D3:02:C1:DB

Camera Serial: CAMERA_00:02:D3:02:C1:DB

Number of signatures: 1

Signature #1

Signature Timestamp: Thu Nov 18 09:05:45 CST 2004 (1100790345503)

Number of distinct images: 9

Image timestamps:

Thu Nov 18 09:04:33 CST 2004 (1100790273097)

Thu Nov 18 09:04:34 CST 2004 (1100790274094)

Thu Nov 18 09:04:36 CST 2004 (1100790276094)

Thu Nov 18 09:04:37 CST 2004 (1100790277104)

Thu Nov 18 09:04:38 CST 2004 (1100790278104)

Thu Nov 18 09:04:39 CST 2004 (1100790279104)

Thu Nov 18 09:04:40 CST 2004 (1100790280114)

Thu Nov 18 09:04:41 CST 2004 (1100790281114)

Thu Nov 18 09:04:42 CST 2004 (1100790282114)

Image SHA-1 Hash: 490220249CFF986B581CEFC2EEA421AE303AB83A

Here is an example of the output that AVIVRFY.BAT generates when used on a signed AVI file that

has been tampered with:

sample.avi is not valid - Invalid length - 203398!=206012

Note

• If the AVI file is not stored in the same directory as the AVIVRFY.BAT program, be sure

to specify the fully qualified path to the file as part of avifilename.

• AVIVRFY.BAT can be used to verify multiple signed AVIs simultaneously. To verify

multiple AVIs, simply append additional avifilename parameters to the command. For

example, using the command

avivrfy sample.avi sample1.avi sample2.avi

would verify three AVI files, named sampl.avi, sample1.avi, and sample2.avi

simultaneously.

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APC NBRK0320E Datasheet Page 208