Transport-layer security is important to consumers who are concerned about privacy. Skype's use of supernodes and relay hosts as part of its network architecture creates a requirement for robust transport-layer security, because under certain circumstances, Skype network traffic may travel through computers that are not party to a call, text chat, or file-transfer session. Transport-layer security is a concept that speaks to the degree to which network traffic between such systems is protected by some sort of cryptographic model. Transport layer is a term defined by the Open Systems Interconnection (OSI) standard, which is a reference model that speaks to the end-to-end transfer of data between users and systems in a network.
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