- A message digest is a cryptographic hash function containing a string of digits created by a one-way hashing formula.
- Encryption is a two-step process used to first encrypt and then decrypt a message
- Hashing condenses a message into an irreversible fixed-length value, or hash
- MD5 & SHA-1
- Only used to verify the data. Message cannot be retrieved back.
- Hash is a result of the original message plus a secret key
- md5sum and sha1sum utilities on a Linux or UNIX machine to experiment with hashing
- Also known as Message Digest , Hashing, Checksum.
- Checksums or digital fingerprints at download sites
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