Patent
Method and apparatus for managing secure collaborative transactions
Walter Tuvell,Nimisha Asthagiri +1 more
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TLDR
In this paper, different levels of security are provided in a security system so that users can decide the security level of their own communications and maintain a low level of security and maintain the security overhead as low as possible.Abstract:
Different levels of security are provided in a security system so that users can decide the security level of their own communications. Users can choose a low level of security and maintain the security overhead as low as possible. Alternatively, they can choose higher levels of security with attendant increases in security overhead. The different levels of security are created by the use of one or more of two keys: an encryption key is used to encrypt plaintext data in a delta and a message authentication key is used to authenticate and insure integrity of the data. Two keys are used to avoid re-encrypting the encrypted data for each member of the telespace. In one embodiment, the security level is determined when a telespace is created and remains fixed through out the life of the telespace. For a telespace, the security level may range from no security at all to security between the members of the telespace and outsiders to security between pairs of members of the telespace. In another embodiment, subgroups called “tribes” can be formed within a telespace and each tribe adopts the security level of the telespace in which it resides.read more
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References
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Journal ArticleDOI
Secure group communications using key graphs
TL;DR: It is shown that the group key management service, using any of the three rekeying strategies, is scalable to large groups with frequent joins and leaves, and the average measured processing time per join/leave increases linearly with the logarithm of group size.
Proceedings ArticleDOI
Multicast security: a taxonomy and some efficient constructions
TL;DR: A taxonomy of multicast scenarios on the Internet and an improved solution to the key revocation problem are presented, which can be regarded as a 'midpoint' between traditional message authentication codes and digital signatures.
Journal ArticleDOI
Prudent engineering practice for cryptographic protocols
Martín Abadi,Roger M. Needham +1 more
TL;DR: The principles are informal guidelines that complement formal methods, but do not assume them, and are however helpful, in that adherence to them would have avoided a considerable number of published errors.
Patent
Method and apparatus for collaborative document control
TL;DR: In this article, a method and apparatus for controlling collaborative access to a work group document by the users of a computer system is described, where a combination of public-key cryptographic methods, symmetric cryptographic methods and message digest generation methods are used.
Patent
Method and apparatus for identifying and discarding junk electronic mail
TL;DR: In this paper, a group of trusted users can collectively determine whether a given electronic mail message is junk e-mail, and if the message is determined to be junk mail, other trusted users in the group dispose of unviewed copies of the junk e mail.