Digital forensics: Suppose that we a record but not sure which one is the original one and which one has been modified: A) Bob leaves the hotel at 7:00 pm B) Bob leaves the hotel at 6:00 pm Fortunately, we have the hash value of the original record, calculated by SHA-256: 2655a8151189efae706db96460d368ab6adb9f5a1b88e5aa5c6ea18ba65beadd Please tell us which one is the original one, A or B?  (Hint: You can use the SHA-256 calculator at https://xorbin.com/tools/sha256-hash-calculator).

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A:

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Cryptography

Cryptography is a term used in computer science to describe secure information and communication techniques that transform messages in difficult-to-decipher ways using mathematical concepts and a set of rule-based calculations known as algorithms.