Gotcha! Computer Technology Helps Catch the Bad Guys

Life’s becoming a little more difficult for lawbreakers, thanks to some new digital technologies. For example, British researchers have developed a fingerprint compression technology that transmits prints from a crime scene to a fingerprint bureau in a fraction of the typical four to 20 minutes. The same researchers are working on a technology to identify shoe impressions taken from crime scenes-a procedure currently done manually.

Police in Richmond, Virginia, are introducing data mining, predictive analysis and business intelligence tools to respond more rapidly to a crime, and possibly to prevent future crime from occurring. LAPD police are using video surveillance and criminal recognition software to get a bird’s-eye view of activities in a crime-riddled area.


Various technologies are gaining prominence, such as the somewhat controversial but highly regarded CompStat. CompStat assists law enforcement organizations in collecting and organizing crime information quickly. This, in turn, allows officials to identify emerging patterns in criminal activity, and allows police agencies to deploy resources more effectively.

According to , proponents describe this technology as an “advanced statistical analysis of crime aimed at preventing future crime.”

This award-winning program is said to have reduced crime rates through increased police accountability. Various law enforcement agencies across the United States, including the NYPD and the LYPD, use this program to analyze data and plan crime-prevention tactics. The program apparently played a key role in the well-documented reduction in crime enjoyed by New York City under the hand of former mayor Rudy Giuliani.

In With the Old

Sometimes harnessing the power of crime-fighting technologies involves using older technologies in new and inventive ways. For example, in late 2006, New York City announced plans to equip 911 call centers to receive digital images and digital videos sent from cell phones and computers. When citizens report a crime in progress, they can simultaneously send pictures or video of the crime scene, the perpetrator or the victim.

The digital imagery provides emergency response workers and law enforcement teams with a better understanding of the situation, and is likely to offer information not provided by panicked callers. The response teams can therefore better access the preferred approach to handling the incident. Empowering citizens to use everyday technology in this way was a world first, according to Mayor Michael Bloomberg.

In a similar vein, the New York City is combating domestic violence in part through the MapInfo Professional mapping software application. This tool allows law enforcement personnel to better visualize relationships between data and geography.

The city is also using MapInfo’s Mapmaker tool for mapping and analyzing data and adding geographic coordinates to database records. A city spokesperson reported that he had imported miscellaneous, city-based data-such as roadmaps, English proficiency ratings and homicide rates-into MapInfo, and then overlaid that over a map of the city to display patterns and trends.

The information generated by these tools assists the city in deciding how resources should be allocated. It also reveals information about an area’s cultural makeup and languages most often spoken in that community. Knowing where domestic violence victims live and the language they speak allows law enforcement officers to better communicate with victims.

Real-Life Success

These and other forensic technologies translate into real-life success stories that impact upon our lives in ways we could not have imagined 20 years ago. For example, in San Jose in October, a man driving a stolen Toyota kidnapped a 12-year-old girl. The girl escaped and reported the incident to the police. The kidnapper abandoned the Toyota. Some hours later, a patrol car using license-plate recognition technology passed the Toyota. “Stolen car” remarked the technology’s computer-generated voice. The police officer discovered evidence in the Toyota that led to the arrest of the kidnapper.

Europe and Britain have used license-plate recognition technology for more than 20 years, but it is relatively new on the scene in the United States. The police have been able to enter license plates into a computer manually, but this technology lets them scan the plate of every car they pass. An officer can now check as many as 12,000 plates per shift, instead of the 50 that could be done manually. Although the technology raises concerns with privacy watchdogs, it is difficult to argue that any privacy violation occurred in this example.

In another interesting and recent development, Thai researchers used nanotechnology to develop a set of eyeglasses that easily detect invisible traces of bodily fluids left at a crime scene. The scientists applied nano crystallized indium osynitride to glass or plastic lenses. These special lenses can filter light waves of various lengths, and allow the user to see invisible traces of saliva, sperm, blood and lymph immediately.

The current technology-a forensic light source-also allows investigators to see traces that cannot be seen with the naked eye. However, this is an awkward and time-consuming procedure, since forensic teams must check separately for each type of fluid. Once the new technology is patented and commercialized, it will dramatically speed up this process.

Closer to home, researchers at the University of Missouri-Columbia have found a mathematical solution that can separate one sound from another in a recording of a noisy environment. In what is referred to as the “cocktail party” problem, sound editing technologies have been unable to separate one voice from many voices in busy environments, such as the cocktail party example, or in a crowded mall. Researchers in the past have separated voices, but could not reproduce the voice’s characteristics.

Current technologies are not completely reliable because they confuse voices with other voices with similar pitches. With the new mathematical solution and assistance from computer programmers, the researchers hope to develop a software application that will allow law enforcement agencies or the Department of Homeland Security to isolate voices or sounds with reliability.

Sadly, though, there’s a flip side to all this good news. In an interview with Computerworld magazine, Frank Abagnale, the notorious (former) criminal depicted in the movie Catch Me if you Can , remarked that it would be 4,000 times easier for him to commit his crimes today than it was 40 years ago-and that today he probably wouldn’t go to prison for it.

“Technology breeds crime-it always has, it always will,” he is reported to have said.

Get To Know What is Forensic Science

Most people got to know about forensic science due to the very famous television program, shown throughout the world – Crime Scene Investigation (CSI). This series have somehow given viewers an in-depth exposure in the forensic industry. In the show, there are several teams comprised of young investigators or probers equipped with vast forensic skills to crack and disclose the most mysterious and complicated criminal cases. Most of the time, the analysis of such evidences will lead to very unpredictable results. In reality, there are few areas that live under the field of forensic.

There is forensic anthropology. These forensic experts will search, recover and analyze dead bodies with the intention of disclosing the real identities of those unidentified victims. They can deal with a wide array of corpses; mummified, skeletons or decomposed, burned or also unrecognizable bodies to determine their height, age at death, pathology, ancestry and sex. Other evaluations such as time and manner of death can also be estimated. They also encompass cases where deaths are caused by accident, suicide, mass disasters or even the violations of human rights.

Another forensic field operating under forensic science is the forensic pathology. These experts are also known as medical examiners where they perform autopsies onto corpses to determine the cause of death and their identities. Autopsies are usually carried out if the death was sudden or unexpected, particularly cases like suicides, accidents, tragedies or homicides.

There are also minor islands in the sea of forensic. The forensic dentistry or odontology is the specialized experts in using dental proofs to determine the identity. During tragedies where plenty of deaths occur, dental remains would be very helpful. Besides, these forensic experts can also analyze bite marks and make comparisons to the dental features of a suspect. Forensic nurses will handle the recognition affairs of abuse cases, either physical, sexual or child abuse as well as criminal cases involving sexual abuse and adult violence.

Forensic technology and forensic chemistry are responsible for chemical analysis such as drugs or poisons that are present in the corpses or crime scenes. Molecular biology and DNA analysis are also getting popular in the field of forensic science as they are really useful in corpse identification.

Beginner’s Guide to Computer Forensics

Computer forensics is the practice of collecting, analysing and reporting on digital information in a way that is legally admissible. It can be used in the detection and prevention of crime and in any dispute where evidence is stored digitally. Computer forensics has comparable examination stages to other forensic disciplines and faces similar issues.

About this guide
This guide discusses computer forensics from a neutral perspective. It is not linked to particular legislation or intended to promote a particular company or product and is not written in bias of either law enforcement or commercial computer forensics. It is aimed at a non-technical audience and provides a high-level view of computer forensics. This guide uses the term “computer”, but the concepts apply to any device capable of storing digital information. Where methodologies have been mentioned they are provided as examples only and do not constitute recommendations or advice. Copying and publishing the whole or part of this article is licensed solely under the terms of the Creative Commons – Attribution Non-Commercial 3.0 license

Uses of computer forensics
There are few areas of crime or dispute where computer forensics cannot be applied. Law enforcement agencies have been among the earliest and heaviest users of computer forensics and consequently have often been at the forefront of developments in the field. Computers may constitute a ‘scene of a crime’, for example with hacking [ 1] or denial of service attacks [2] or they may hold evidence in the form of emails, internet history, documents or other files relevant to crimes such as murder, kidnap, fraud and drug trafficking. It is not just the content of emails, documents and other files which may be of interest to investigators but also the ‘meta-data’ [3] associated with those files. A computer forensic examination may reveal when a document first appeared on a computer, when it was last edited, when it was last saved or printed and which user carried out these actions.

More recently, commercial organisations have used computer forensics to their benefit in a variety of cases such as;

  • Intellectual Property theft
  • Industrial espionage
  • Employment disputes
  • Fraud investigations
  • Forgeries
  • Matrimonial issues
  • Bankruptcy investigations
  • Inappropriate email and internet use in the work place
  • Regulatory compliance

For evidence to be admissible it must be reliable and not prejudicial, meaning that at all stages of this process admissibility should be at the forefront of a computer forensic examiner’s mind. One set of guidelines which has been widely accepted to assist in this is the Association of Chief Police Officers Good Practice Guide for Computer Based Electronic Evidence or ACPO Guide for short. Although the ACPO Guide is aimed at United Kingdom law enforcement its main principles are applicable to all computer forensics in whatever legislature. The four main principles from this guide have been reproduced below (with references to law enforcement removed):

  1. No action should change data held on a computer or storage media which may be subsequently relied upon in court.
  2. In circumstances where a person finds it necessary to access original data held on a computer or storage media, that person must be competent to do so and be able to give evidence explaining the relevance and the implications of their actions.
  3. An audit trail or other record of all processes applied to computer-based electronic evidence should be created and preserved. An independent third-party should be able to examine those processes and achieve the same result.
  4. The person in charge of the investigation has overall responsibility for ensuring that the law and these principles are adhered to.

In summary, no changes should be made to the original, however if access/changes are necessary the examiner must know what they are doing and to record their actions.

Live acquisition
Principle 2 above may raise the question: In what situation would changes to a suspect’s computer by a computer forensic examiner be necessary? Traditionally, the computer forensic examiner would make a copy (or acquire) information from a device which is turned off. A write-blocker[4] would be used to make an exact bit for bit copy [5] of the original storage medium. The examiner would work then from this copy, leaving the original demonstrably unchanged.

However, sometimes it is not possible or desirable to switch a computer off. It may not be possible to switch a computer off if doing so would result in considerable financial or other loss for the owner. It may not be desirable to switch a computer off if doing so would mean that potentially valuable evidence may be lost. In both these circumstances the computer forensic examiner would need to carry out a ‘live acquisition’ which would involve running a small program on the suspect computer in order to copy (or acquire) the data to the examiner’s hard drive.

By running such a program and attaching a destination drive to the suspect computer, the examiner will make changes and/or additions to the state of the computer which were not present before his actions. Such actions would remain admissible as long as the examiner recorded their actions, was aware of their impact and was able to explain their actions.

Stages of an examination
For the purposes of this article the computer forensic examination process has been divided into six stages. Although they are presented in their usual chronological order, it is necessary during an examination to be flexible. For example, during the analysis stage the examiner may find a new lead which would warrant further computers being examined and would mean a return to the evaluation stage.

Forensic readiness is an important and occasionally overlooked stage in the examination process. In commercial computer forensics it can include educating clients about system preparedness; for example, forensic examinations will provide stronger evidence if a server or computer’s built-in auditing and logging systems are all switched on. For examiners there are many areas where prior organisation can help, including training, regular testing and verification of software and equipment, familiarity with legislation, dealing with unexpected issues (e.g., what to do if child pornography is present during a commercial job) and ensuring that your on-site acquisition kit is complete and in working order.

The evaluation stage includes the receiving of clear instructions, risk analysis and allocation of roles and resources. Risk analysis for law enforcement may include an assessment on the likelihood of physical threat on entering a suspect’s property and how best to deal with it. Commercial organisations also need to be aware of health and safety issues, while their evaluation would also cover reputational and financial risks on accepting a particular project.

The main part of the collection stage, acquisition, has been introduced above. If acquisition is to be carried out on-site rather than in a computer forensic laboratory then this stage would include identifying, securing and documenting the scene. Interviews or meetings with personnel who may hold information which could be relevant to the examination (which could include the end users of the computer, and the manager and person responsible for providing computer services) would usually be carried out at this stage. The ‘bagging and tagging’ audit trail would start here by sealing any materials in unique tamper-evident bags. Consideration also needs to be given to securely and safely transporting the material to the examiner’s laboratory.

Analysis depends on the specifics of each job. The examiner usually provides feedback to the client during analysis and from this dialogue the analysis may take a different path or be narrowed to specific areas. Analysis must be accurate, thorough, impartial, recorded, repeatable and completed within the time-scales available and resources allocated. There are myriad tools available for computer forensics analysis. It is our opinion that the examiner should use any tool they feel comfortable with as long as they can justify their choice. The main requirements of a computer forensic tool is that it does what it is meant to do and the only way for examiners to be sure of this is for them to regularly test and calibrate the tools they use before analysis takes place. Dual-tool verification can confirm result integrity during analysis (if with tool ‘A’ the examiner finds artefact ‘X’ at location ‘Y’, then tool ‘B’ should replicate these results.)

This stage usually involves the examiner producing a structured report on their findings, addressing the points in the initial instructions along with any subsequent instructions. It would also cover any other information which the examiner deems relevant to the investigation. The report must be written with the end reader in mind; in many cases the reader of the report will be non-technical, so the terminology should acknowledge this. The examiner should also be prepared to participate in meetings or telephone conferences to discuss and elaborate on the report.

Along with the readiness stage, the review stage is often overlooked or disregarded. This may be due to the perceived costs of doing work that is not billable, or the need ‘to get on with the next job’. However, a review stage incorporated into each examination can help save money and raise the level of quality by making future examinations more efficient and time effective. A review of an examination can be simple, quick and can begin during any of the above stages. It may include a basic ‘what went wrong and how can this be improved’ and a ‘what went well and how can it be incorporated into future examinations’. Feedback from the instructing party should also be sought. Any lessons learnt from this stage should be applied to the next examination and fed into the readiness stage.

Issues facing computer forensics
The issues facing computer forensics examiners can be broken down into three broad categories: technical, legal and administrative.

Encryption – Encrypted files or hard drives can be impossible for investigators to view without the correct key or password. Examiners should consider that the key or password may be stored elsewhere on the computer or on another computer which the suspect has had access to. It could also reside in the volatile memory of a computer (known as RAM [6] which is usually lost on computer shut-down; another reason to consider using live acquisition techniques as outlined above.

Increasing storage space – Storage media holds ever greater amounts of data which for the examiner means that their analysis computers need to have sufficient processing power and available storage to efficiently deal with searching and analysing enormous amounts of data.

New technologies – Computing is an ever-changing area, with new hardware, software and operating systems being constantly produced. No single computer forensic examiner can be an expert on all areas, though they may frequently be expected to analyse something which they haven’t dealt with before. In order to deal with this situation, the examiner should be prepared and able to test and experiment with the behaviour of new technologies. Networking and sharing knowledge with other computer forensic examiners is also very useful in this respect as it’s likely someone else may have already encountered the same issue.

Anti-forensics – Anti-forensics is the practice of attempting to thwart computer forensic analysis. This may include encryption, the over-writing of data to make it unrecoverable, the modification of files’ meta-data and file obfuscation (disguising files). As with encryption above, the evidence that such methods have been used may be stored elsewhere on the computer or on another computer which the suspect has had access to. In our experience, it is very rare to see anti-forensics tools used correctly and frequently enough to totally obscure either their presence or the presence of the evidence they were used to hide.

Legal issues
Legal arguments may confuse or distract from a computer examiner’s findings. An example here would be the ‘Trojan Defence’. A Trojan is a piece of computer code disguised as something benign but which has a hidden and malicious purpose. Trojans have many uses, and include key-logging [7], uploading and downloading of files and installation of viruses. A lawyer may be able to argue that actions on a computer were not carried out by a user but were automated by a Trojan without the user’s knowledge; such a Trojan Defence has been successfully used even when no trace of a Trojan or other malicious code was found on the suspect’s computer. In such cases, a competent opposing lawyer, supplied with evidence from a competent computer forensic analyst, should be able to dismiss such an argument.

Accepted standards – There are a plethora of standards and guidelines in computer forensics, few of which appear to be universally accepted. This is due to a number of reasons including standard-setting bodies being tied to particular legislations, standards being aimed either at law enforcement or commercial forensics but not at both, the authors of such standards not being accepted by their peers, or high joining fees dissuading practitioners from participating.

Fitness to practice – In many jurisdictions there is no qualifying body to check the competence and integrity of computer forensics professionals. In such cases anyone may present themselves as a computer forensic expert, which may result in computer forensic examinations of questionable quality and a negative view of the profession as a whole.

Resources and further reading
There does not appear to be a great amount of material covering computer forensics which is aimed at a non-technical readership. However the following links at links at the bottom of this page may prove to be of interest prove to be of interest:

1. Hacking: modifying a computer in way which was not originally intended in order to benefit the hacker’s goals.
2. Denial of Service attack: an attempt to prevent legitimate users of a computer system from having access to that system’s information or services.
3. Meta-data: at a basic level meta-data is data about data. It can be embedded within files or stored externally in a separate file and may contain information about the file’s author, format, creation date and so on.
4. Write blocker: a hardware device or software application which prevents any data from being modified or added to the storage medium being examined.
5. Bit copy: bit is a contraction of the term ‘binary digit’ and is the fundamental unit of computing. A bit copy refers to a sequential copy of every bit on a storage medium, which includes areas of the medium ‘invisible’ to the user.
6. RAM: Random Access Memory. RAM is a computer’s temporary workspace and is volatile, which means its contents are lost when the computer is powered off.
7. Key-logging: the recording of keyboard input giving the ability to read a user’s typed passwords, emails and other confidential information.