Question 61

Hashing should be performed to verify the integrity of a file transferred from one device to another.

Hashing is a process that generates a fixed-size string of characters (a hash) from input data, which can then be used to verify the integrity of that file. If the hash value of the transferred file matches the original hash value, it confirms that the file has not been altered during the transfer.

A) Authentication

Authentication is the process of verifying the identity of a user or device, ensuring that they are who they claim to be. While important for access control, it does not specifically address the integrity of the file itself during transfer.

B) Obfuscation

Obfuscation involves making data unclear or unintelligible to protect it from unauthorized access. While this can enhance security, it does not serve the purpose of verifying whether the file has been altered during transmission.

C) Hashing

Hashing is the correct method for verifying file integrity, as it creates a unique hash value for the original file. When the file is transferred, generating a new hash value and comparing it to the original will confirm if the file has remained unchanged.

D) Encryption

Encryption is the process of converting information into a code to prevent unauthorized access. While it secures data in transit, it does not provide a mechanism to check if the file has retained its integrity after transfer.

Conclusion

Hashing is the definitive method for verifying the integrity of files, as it allows for the comparison of hash values to detect any alterations. The other options do not address integrity verification directly, focusing instead on aspects of security or identity verification that are not relevant to this specific task.