Cryptographic Properties Sample Clauses

Cryptographic Properties. In this section we summarize the desired properties for a secure group key agreement protocol. Following the model of [18], we define four such properties:
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Cryptographic Properties. There are four important security properties encountered in group key agreement. (Assume that a group key is changed m times and the sequence of successive group keys is K = fK0; :::; Kmg).
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Cryptographic Properties. In this section we summarize the desired properties for a secure group key agreement protocol. Following the model of [KPT00], we define six such properties: Weak Backward Secrecy guarantees that previously used group keys must not be discovered by new group members. Weak Forward Secrecy guarantees that new keys must remain out of reach of former group members. Group Key Secrecy guarantees that it is computationally infeasible for a passive adversary to discover any group key. Forward Secrecy (Not to be confused with Perfect Forward Secrecy or PFS) guarantees that a passive adversary who knows a contiguous subset of old group keys cannot discover subsequent group keys. Backward Secrecy guarantees that a passive adversary who knows a contiguous subset of group keys cannot discover preceding group keys. Key Independence guarantees that a passive adversary who knows any proper subset of group keys cannot discover any other group key. The relationship among the properties is intuitive. The first two (often typically called Forward and Backward Secrecy in the literature) are different from the others in the sense that the adversary is assumed to be a current or a former group member. The other properties additionally include the cases of inadvertently leaked or otherwise compromised group keys. Forward and Backward Secrecy is a stronger condition than Weak Forward and Backward Secrecy. Either of Backward or Forward Secrecy subsumes Group Key Secrecy and Key Independence subsumes the rest. Finally, the combination of Backward and Forward Secrecy yields Key Independence. In this paper we do not assume key authentication as part of the group key management protocols. All communication channels are public but authentic. The latter means that all messages are digitally signed by the sender using some sufficiently strong public key signature method such as DSA or RSA. All receivers are required to verify signatures on all received messages. Since no other long-term secrets or keys are used, we are not concerned with Perfect Forward Secrecy (PFS) as it is achieved trivially.
Sample 1
Cryptographic Properties. In this section we summarize the desired properties for a secure group key agreement protocol. Following the model of [KPT00], we define six such properties: ■ Weak Backward Secrecy guarantees that previously used group keys must not be discovered by new group members. ■ Weak Forward Secrecy guarantees that new keys must remain out of reach of former group members. ■ Group Key Secrecy guarantees that it is computationally infeasible for a passive adversary to discover any group key. ■ Forward Secrecy (Not to be confused with Perfect Forward Secrecy or PFS) guarantees that a passive adversary who knows a contiguous subset of old group keys cannot discover subsequent group keys.
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  • Owned Properties The "Owned Real Property Schedule" attached hereto sets forth a list of all owned real property (the "Owned Real Property") used by the Company or any of it Subsidiaries in the operation of the Company's or any of it Subsidiaries' business. With respect to each such parcel of Owned Real Property and except for Liens in favor of the Senior Lenders: (i) such parcel is free and clear of all covenants, conditions, restrictions, easements, liens or other encumbrances, except Permitted Encumbrances; (ii) there are no leases, subleases, licenses, concessions, or other agreements, written or oral, granting to any person the right of use or occupance of any portion of such parcel; and (iii) there are no outstanding actions or rights of first refusal to purchase such parcel, or any portion thereof or interest therein.

  • Access to Properties Subject to the rights of Tenants, Borrower shall permit agents, representatives and employees of Lender to inspect the Properties or any part thereof at reasonable hours upon reasonable advance notice.

  • Access to Properties and Records (a) CCE shall, and shall cause TPC to, afford to ETP and ETP’s accountants, counsel and representatives full reasonable access during normal business hours throughout the period prior to the Closing Date (or the earlier termination of this Agreement pursuant to Article VII hereof) to all of the properties, books, contracts, commitments and records (including all environmental studies, reports and other environmental records and all pipeline cost-of-service and rate-related studies, reports and records related to TPC and, during such period, shall furnish to ETP all information concerning the business, properties, Liabilities and personnel related to TPC as ETP may request, provided, however, that no investigation or receipt of information pursuant to this Section 5.2 shall affect any representation or warranty of CCE or the conditions to the obligations of ETP. To the extent not located at the offices or properties of TPC as of the Closing Date, as promptly as practicable thereafter, CCE shall deliver, or cause its appropriate Affiliates to deliver to ETP all of the books of accounts, minute books, record books and other records (including safety, health, environmental, maintenance and engineering records and drawings) pertaining to the business operations of TPC and all financial and accounting records related to TPC. Such delivery shall include all work papers, pleadings, testimony, exhibits, spread sheets, research, drafts, memoranda, correspondence and other documents related to the TPC Rate Case (“TPC Rate Case Work Product”). TPC Rate Case Work Product has been and will be prepared in contemplation of litigation, and the use of TPC Rate Case Work Product has been and will be under the control of TPC’s attorneys. Notwithstanding anything to the contrary contained in this Agreement, CCE shall not be obligated to provide to ETP any documents or records relating to litigation and regulatory matters in which TPC is involved to the extent that CCE reasonably believes such documents or records are subject to the attorney-client or other applicable privilege in circumstances in which TPC is not the sole client unless the parties entitled to such attorney-client or other applicable privilege shall consent thereto and enter into an appropriate joint defense agreement for the purpose of preservation of such attorney-client or other applicable privilege.

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