Exam SY0-601 topic 1 question 81 discussion

Answer: Calculate the checksum using a hashing algorithm. (D) A checksum is specifically intended to verify the integrity of data or find data corruption. Comparing a file's original and current checksum. And if a byte or even a piece of the file's data has been changed, the original and current checksum will be different, and therefore you will know whether it's the same file or not. ===================== (A) - This is essentially the physical version of checking if something was tampered but wouldn't work for virtual data (B) - Dont need to encrypt anything (C) - Even if a proper chain of custody was followed, it doesn't guarantee that data hasn't been modified by anyone that had access to the data.

Procedure to establish the Chain of Custody In order to assure the authenticity of the chain of custody, a series of steps must be followed. It is important to note that the more information Forensic expert obtains concerning the evidence, the more authentic is the created chain of custody. You should ensure that the following procedure is followed according to the chain of custody for electronic devices: Save the original material Take photos of the physical evidence Take screenshots of the digital evidence. Document date, time, and any other information on the receipt of the evidence. Inject a bit-for-bit clone of digital evidence content into forensic computers. Perform a hash test analysis to authenticate the working clone.

He or she needs to run a checksum.

"...needs to prove that data has not been tampered" The only way to prove this, is by calculating a CHECKSUM for data collected at each stage of the discovery (D). Ensuring a "chain of custody" is adhered to, would not be enough basis of proof, that someone within the chain DID NOT tamper with the data, and pass it further along.

Everyone picking Chain of Custody is missing the point. Establishing a chain of custody doesn't prevent tampering nor allow you to prove that data has been tampered. What it does is give you an audit trail to follow if you discover that evidence was in fact tampered with, and you can use it to identify who in the chain of custody tampered with the evidence. To actually PROVE that the data hasn't been tampered with, you would calculate a checksum, likely at each step of the chain of custody when the data is received by the next party.

There is no chain of custody for data transmission, chain of custody is mainly for equipment/devices that are used on the network by end-users. Hashing and checksum are the only ways to check the integrity of data.

It's D. Consider the role. The analyst, as the expert, would validate the checksum. A lawyer or court official would validate via the CoC. Additionally, anyone can access the data, change it, and properly mark up the chain of custody. If only using the chain of custody without validating the integrity, false data would be accepted.

The question asked for what method to verify the integrity of the file in question. the simple answer is to compare the hash valve with the original when it was collected. The correct answer is D. Ensuring that the proper chain of custody was followed is still subject to interpretation and can not prove the data has not changed.

My answer is D

A checksum is a value derived from the content of data, and it serves as a unique identifier for that data. When data is collected for forensic analysis, the forensic analyst can calculate the checksum using a hashing algorithm (such as MD5, SHA-256, etc.). If the data remains unchanged and has not been tampered with, the checksum will remain the same. Any alteration or tampering of the data would result in a different checksum value. By comparing the calculated checksum of the collected data with a known, trusted checksum (such as the original value), the forensic analyst can verify that the data has not been tampered with since it was collected. This process ensures data integrity and is commonly used in digital forensics to validate the authenticity of evidence.

Calculating the checksum using a hashing algorithm is a common technique in forensic analysis to ensure data integrity. A hashing algorithm takes the data as input and generates a unique hash value, which is a fixed-length string of characters. Even a small change in the input data will result in a significantly different hash value. By comparing the calculated checksum of the collected data with a previously generated checksum of the original data, the forensic analyst can determine if any tampering or alteration has occurred.

i started with C after i read all the comment and i was sure it was D but i find this and it make me change my mind Difference Between a Checksum and a Hash Checksums and similarity hashes are often used interchangeably, but they have slight differences. In a nutshell, a Checksum is a hash, but a hash isn’t necessarily a Checksum. Hashing Applications Encryption Storage Performance Why Use Checksums? Why use checksums to compare data over byte-by-byte comparison? The answer: because it is much smaller (256 bits). Byte by Byte comparison requires having the entire copy of files which can be very large (gigabytes). A checksum’s relatively small size is small enough to be treated as file metadata. How can Checksums be Used? Checksums can be used in many ways: in search engines to check for duplicate documents, in engineering to check for corrupted files in cryptography to transfer data securely.

To prove that data has not been tampered with since it was collected, a forensic analyst would MOST likely calculate the checksum using a hashing algorithm. A hashing algorithm generates a unique fixed-size string of characters, called a hash or checksum, from a given input. By calculating the hash of the collected data and comparing it to the hash calculated at the time of collection, the analyst can verify that the data has not been altered.

C. Ensure proper procedures for chain of custody are being followed. Proper chain of custody procedures ensure that the evidence is properly collected, stored, and transferred to prevent tampering or alteration. By following these procedures, the forensic analyst can demonstrate that the evidence has not been tampered with since it was collected, and can be relied upon as authentic and admissible in court. The other options do not directly address the issue of proving that data has not been tampered with.

While ensuring proper chain of custody is critical, following the process is how you ensure that tampering/mishandling doesn't occur, not how you prove it didn't. To prove that tampering did not occur, the analyst would use hashing.

A checksum is a unique value that is generated from a mathematical algorithm applied to the data. If the data is tampered with in any way, the checksum value will also change, indicating that the data has been altered. By comparing the original checksum value with the current checksum value, the forensic analyst can determine whether the data has been tampered with since it was collected.

I believe that the correct option is C. When they say "data" they do not specific which type of data, could be digital or not. If not digital then the checksum will not be helful. In this case the most likely approach would be keep chain of custody.