Difference between pages "CDMA" and "Jhead"

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(Software: Added Oxygen Forensic Suite 2)
 
(Example output.)
 
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'''Code division multiple access''' ('''CDMA''') is a cellular frequency that, originally developed during World War II for military purposes, incorporates "spread spectrum" techniques. Unlike other cellular systems like [[GSM]] and [[TDMA]], every channel on the network uses the full available spectrum. This allows each user (identified by a unique [[pseudonoise code]] ([[PN]])) to communicate over several frequencies, as opposed to only one. CDMA is an improved version of TDMA (Time Division Multiple Access). TDMA uses a time-sharing protocol to provide three to four times more capacity than analog systems, just as a GSM.
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{{Infobox_Software |
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  name = jhead |
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  maintainer = [[Matthias Wandel]] |
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  os = [[Linux]], [[Windows]] |
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  genre = [[Metadata]] |
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  license = [[Public Domain]] |
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  website = [http://www.sentex.net/~mwandel/jhead/ sentex.net/~mwandel/jhead/] |
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}}
  
== History ==
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'''jhead''' is a program which can display or manipulate the non-image part of [[Exif]] compliant [[JPEG]] files.
  
[[Qualcomm]] developed the key advances that made CDMA suitable for [[cell phones|cellular phones]] and conducted an open demonstration in San Diego in November 1989.
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== Example ==
  
The first CDMA network was launched commercially in 1995 as [[cdmaOne]] and provided approximately 10 times more capacity than analog networks. CDMA has become the fastest-growing of all wireless technologies, with over 100 million subscribers worldwide.
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This is an example of the output of jhead:
  
== Benefits ==
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$ jhead [[:Image:Simpic.jpg|Simpic.jpg]]
 
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File name    : Simpic.jpg
* Greater capacity. Provides 10-20 times the capacity of analog equipment and three times the capacity of other digital platforms.
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File size    : 146060 bytes
* Excellent voice and call quality through the filtering out of background noise, cross-talk, and interference.
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File date    : 2006:04:04 20:10:51
* Rapid deployment. CDMA systems can be expanded quickly and more cost effectively than most landline networks.
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Camera make  : Canon
* Fewer dropped calls.
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Camera model : Canon PowerShot Pro1
* Improved security and privacy because of CDMA's digitally encoded transmissions.
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Date/Time    : 2005:12:15 14:47:02
* Reduced background noise and interference by combining multiple signals which improves signal strength.
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Resolution  : 779 x 524
 
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Flash used  : No
== Forensics ==
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Focal length : 10.6mm  (35mm equivalent: 158mm)
 
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CCD width    : 2.40mm
CDMA phones do not have the advantage of [[SIM Cards]], so forensics can only be done on the phone itself, as all relevant data is stored directly on the phone. This information includes the [[phonebook]], [[call history]] log, [[SMS]] messages, and any calendar or to-do applications the phone might have.
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Exposure time: 0.0031 s  (1/320)
 
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Aperture    : f/4.0
Due to the fact that the phone must be physically connected to a forensics workstation for data acquisition, it is important to be aware of the phone's battery state (a charging cable should be obtained to ensure constant power), and blocking the phone's signal. Also, the correct data cable must be obtained to connect the phone to the workstation ([[Susteen]] provides a kit that includes many cables for the most popular phones).
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ISO equiv.   : 50
 
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Exposure bias: 1.00
=== Software ===
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Whitebalance : Manual
 
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Metering Mode: center weight
Software for acquiring a CDMA-based phone includes:
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Exposure Mode: Manual
 
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Exposure Mode: Auto bracketing
* [[BitPIM]]
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* [[DataPilot Secure View]]
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* [[Oxygen Forensic Suite 2]]
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* [[Paraben Cell Seizure]]
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== External Links ==
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* [http://en.wikipedia.org/wiki/Cdma Wikipedia: CDMA]
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* [http://www.bitpim.org BitPIM]
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* [http://www.susteen.com DataPilot Secure View]
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* [http://www.paraben-forensics.com Paraben Device Seizure]
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Revision as of 13:13, 4 April 2006

jhead
Maintainer: Matthias Wandel
OS: Linux, Windows
Genre: Metadata
License: Public Domain
Website: sentex.net/~mwandel/jhead/

jhead is a program which can display or manipulate the non-image part of Exif compliant JPEG files.

Example

This is an example of the output of jhead:

$ jhead Simpic.jpg 
File name    : Simpic.jpg
File size    : 146060 bytes
File date    : 2006:04:04 20:10:51
Camera make  : Canon
Camera model : Canon PowerShot Pro1
Date/Time    : 2005:12:15 14:47:02
Resolution   : 779 x 524
Flash used   : No
Focal length : 10.6mm  (35mm equivalent: 158mm)
CCD width    : 2.40mm
Exposure time: 0.0031 s  (1/320)
Aperture     : f/4.0
ISO equiv.   : 50
Exposure bias: 1.00
Whitebalance : Manual
Metering Mode: center weight
Exposure Mode: Manual
Exposure Mode: Auto bracketing