Skype uses this information to authenticate call recipients and assure that callers seeking authentication access a Skype server rather than an impostor. Skype holds registration information both on the caller's computer and on a Skype server. Implementation and protocols Registration This claim was undermined in May 2013 by evidence that Microsoft (owner of Skype) has pinged unique URLs embedded in a Skype conversation this could only happen if Microsoft has access to the unencrypted form of these messages. No intermediate node ( router) has access to the meaning of these messages. Messages transmitted between Skype users (with no PSTN users included) are encrypted from caller to caller.Each verifies the other's evidence before the session can carry messages. Each caller provides the other with proof of identity and privileges whenever a session is established. Callers must present a username and password or another authentication credential.The company's security policy states that:
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