The client creates a session key using its random number generator. Then a 256-bit AES-encrypted session is established with the Skype server. The private key and a password hash are stored on the user's computer. Skype locally generates public and private keys. As part of user registration, the user selects a desired username and password. The Skype server has a private key and distributes that key's public counterpart with every copy of the software. Skype says that it uses public-key encryption as defined by RSA to accomplish this. 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.
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