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Three jobs, three tools

Three jobs, three tools

Three-panel comparison of compression shrinking file size, encryption turning plaintext into ciphertext with a key, and hashing producing a fixed-length digest.

Computers transform data for three main reasons: to make it smaller, to keep it secret, or to check it has not changed. Those goals are handled by compression, encryption and hashing.

Compression, Encryption and Hashing Lesson

  1. A Level
  2. /Computer Science
  3. /Compression, Encryption and Hashing

Step-by-step lessons on OCR A Level Computer Science Compression, Encryption and Hashing. Each one builds up to exam-style questions.

Lessons