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Exploring Dropbox image downloads to iPhone via safari: File system versus camera roll validation study.

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Digital image forensic integrity was assessed transferring from Dropbox to iPhones. Results confirm content integrity is maintained, crucial for digital evidence collection and legal standards like Daubert.

Keywords:
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Area of Science:

  • Digital Forensics
  • Cybersecurity
  • Mobile Device Forensics

Background:

  • Digital images are critical evidence in legal cases.
  • Collecting digital evidence from mobile devices presents unique challenges.
  • Standardized forensic tools are not always available for mobile evidence acquisition.

Purpose of the Study:

  • To evaluate the forensic integrity of digital images transferred from Dropbox to iPhones using Safari.
  • To compare the integrity of images downloaded to the Files app versus the Photos app on iOS devices.
  • To determine if this transfer method preserves data integrity for legal admissibility.

Main Methods:

  • Quantitative, quasi-experimental design analyzing 60 digital images.
  • Testing across three iPhones with iOS versions 14.2 and 14.4.
  • Utilizing cryptographic Secure Hash Algorithm 256 (SHA256) for content integrity and Multiscale Structural Similarity Index (MS-SSIM) for quality assessment.

Main Results:

  • 100% match in SHA256 stream hashes confirmed unchanged pixel data (content integrity).
  • MS-SSIM scores of 1.0 indicated no perceptible image quality degradation.
  • File container hashes were altered in the Photos app but not in the Files folder, due to iOS modifications.

Conclusions:

  • The transfer method preserves digital image content integrity, supporting compliance with legal standards like Daubert.
  • The Files folder maintained container integrity, unlike the Photos app, highlighting structural differences in iOS handling.
  • Further research is recommended across diverse iOS versions, cloud platforms, and devices to broaden applicability.