Which OSI layer is responsible for encrypting and decrypting data?
2012
Which OSI layer is responsible for encrypting and decrypting data?
Answer: C. Presentation layer — ConceptIn the OSI model, the presentation layer manages the representation of application data. Its abstract functions include translation between data…
- A.
Physical layer
- B.
Data Link layer
- C.
Presentation layer
- D.
Session layer
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Correct answer: C
Concept
In the OSI model, the presentation layer manages the representation of application data. Its abstract functions include translation between data formats, compression and decompression, and encryption and decryption.
Application
The task named in the question is the transformation of readable data into a protected representation and the inverse transformation at the receiver. In the OSI functional model, these transformations belong to the presentation layer.
Contrast
Physical layer: carries raw bits by electrical, optical, or radio signals.
Data Link layer: forms frames and manages delivery across one link.
Session layer: establishes and coordinates dialogs between applications.
Cross-check
IBM’s OSI model description lists data translation, encryption/decryption, and compression as presentation-layer responsibilities. These are representation-level transformations rather than signaling, framing, or dialog-control functions.
Result
Therefore, the responsible OSI layer is the presentation layer.