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Skype Network Administrator’s Guide Skype 3.0 Beta 19

2006-10-31 Document version 2.0 Beta

Privacy and Sharing Contact Details

To help manage communication and protect privacy, the Skype client supports a set of

features to give users control of who can see their on-line status (presence information) and

who can contact them. In earlier versions of Skype, this system was referred to as

authorizations.

In general, sharing contact details issues an approval certificate that one Skype user

transmits to another Skype user to grant permission to see on-line status. Sharing contact

details also gives the user permission to communicate freely (call, send IMs, etc.) by

avoiding restrictions that apply to other, non-authorized users, depending on how a given

Skype user has configured his or her privacy preference settings.

Each time a Skype user adds a Skype name to his Contacts List, the Skype client prompts

that user to send a request to share contact details. If the intended person grants the request,

both users will be able to see each other’s on-line status. See “An Example – Sharing

Contact Details” to see how this process unfolds.

If the user denies or ignores the request, his on-line status information will not be visible to

the person who sent the request.

If a user adds a Skype name to his contact list but is not granted permission, the on-line

status information associated with the Skype name is not displayed, and the user gains no

special privileges to communicate with the Skype name based on privacy preferences set

by the user.

A request to share contact details involves a digital signature that gets assigned to the

request, which (once signed) is then sent back to the requestor. It is tied to the same sign-in

credential that is used to authenticate a Skype identity. This method does not simply set

flag or a bit in the message. Therefore, is nearly impossible to fool the system.

Without a doubt, the ability to share contact details is important for Skype users to be able

to maintain their privacy. It is also essential for maintaining control of who can contact

users. Skype allows each user to set his or her own privacy thresholds in terms of who can

call and send IMs.

Specifically, Skype users can set voice/video calling preferences which allow them to

specify that:

• Anyone can call,

• Only people on a user’s Contacts List can call, and

• Only people who are authorized can call.

Users can set IM preferences independently to specify that:

• Anyone can send an IM,

• Only people on the user’s Contacts List can IM,

• Only people the user has authorized can send an IM, and

• File-transfer preferences can be set independently of both calls and IMs.

An Example - Sharing Contact Details

Every time a user adds another user to his or her contact list, a request to share contact

details is generated.

For example, lets say that user Bob wishes to add user Alice to his contact list. In this case,

Bob would select Tools ->Add a Contact... and enter Alice as the Skype username to add

to his contact list.

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Skype - 3.0 beta Guide de l'utilisateur Page 19

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