Clear guidance on ransomware, privacy, and safer file handling.
Learn why downloaded file sizes differ across websites, devices, archives, and HTTP transfers, then use a practical checklist to diagnose the cause.
Compare SHA-256 and MD5 for file verification, choose the right published digest, and understand what a checksum match cannot establish.
A file checksum is a value calculated from file contents. Learn what a match or mismatch means, how checksums differ from hashes, and what they cannot prove.
Calculate a SHA-256 checksum on Windows, macOS, Linux, or in your browser, then compare it with the publisher’s value before opening the download.
Use a practical nine-step workflow and a simple share register to send client files, test recipient access, and close old sharing routes.
Learn what ransomware is, how attacks unfold, what to do if you are hit, and how tested, isolated backups and layered security can reduce the damage.