Protocol Unification Sample Clauses

Protocol Unification. Although described separately in Section IV, the four STR operations (join, leave, merge and partition) actually represent different strands of a single protocol. We justify this claim with an informal argument below.
AutoNDA by SimpleDocs
Protocol Unification. Although described separately in the preceding sections, the four TGDH operations (join, leave, merge and partition) actually represent different strands of a single protocol. We justify this claim with an informal argument below. Obviously, join and leave are special cases of merge and partition, respectively. We observe that merge and partition can be collapsed into a single protocol, since, in either case, the key tree changes and remaining group members lack some number of bkeys. This prevents them from computing the new root key. In a partition, the remaining members (in any surviving group fragment) reconstruct the tree where some bkeys are missing. In case of a merge of two groups, let us suppose that a taller (deeper) tree is merged with a shorter (shallower) tree . Similar to a partition, all members formerly in construct the new tree where some bkeys – those in – are missing. (This view is symmetric since the members in see the same tree but with missing bkeys in the subtree .) We now established that both partition and merge initially result in a new key tree with a number of missing bkeys. In the first round of merge protocol, sponsor in each group broadcasts the key tree after updating its session random. Upon receiving this broadcast message, every member rebuilds a key tree which has some missing bkeys. Filling up this bkeys takes at most rounds. A partition is very similar except the first broadcast message of merge. The apparent similarity between partition and merge allows us to collapse the protocols stemming from all mem- bership events into a single unified protocol. Figure 10 shows the pseudocode. The incentive for doing this is threefold. First, unification allows us to simplify the implementation and minimize its size. Second, the overall security and cor- rectness are easier to demonstrate with a single protocol. Third, we can now claim that (with a slight modification) TGDH is self-stabilizing and fault-tolerant as discussed below. 7 In a join, the new member simply generates its first share.
Protocol Unification. Although described separately in the preceding sections, the four STR oper- ations: join, leave, merge and partition, actually represent different expression of a single protocol. We justify this claim with an informal argument below. Obviously, join and leave are special cases of merge and partition, respec- tively. It is less clear that merge and partition can be collapsed into a single protocol, because in either case, the key tree changes and the remaining group members lack some number (sometimes none) of blinded keys or blinded ses- sion randoms which prevents them from computing the new root key. When a partition occurs, the remaining members reconstruct the tree where some blinded keys are missing. In case of a merge, a shorter tree A is merged into a taller tree B. Any member in B now can compute the group key since it knows blinded session random of any member in A. The deepest member in A also can compute the group key since it knows the blinded session random of any other member in A and blinded group key of B. Using the broadcast message any member now can compute the new group key. We established that both partition and merge initially result in a new key tree with a number of missing blinded keys. In case of merge, the missing blinded keys can be distributed in two rounds. This is because a sponsor in both of A and B broadcasts its own subtree including all blinded keys. Any member in a given subtree can compute the new root key after receiving both broadcasts. The case of partition is very similar except that the missing blinded keys and the new group key can be distributed in one round. This apparent similarity between partition and merge allows us to lump the protocols stemming from all membership events into a single, unified protocol. The following figure shows the pseudocode. receive msg (msg type = membership event) construct new tree while there are missing blinded keys if (I can compute any missing keys and I am the sponsor) compute missing blinded keys broadcast new blinded keys endif receive msg (msg type = broadcast) update current tree endwhile The incentive for this is threefold. First, unification allows us to simplify the implementation and minimize its size. Second, the overall security and correctness are easier to demonstrate with a single protocol. Third, we can now claim that (with a slight modification) the STR protocol is self-stabilizing and fault-tolerant as discussed below.
Protocol Unification. Although described separately in the preceding sections, the four TGDH operations (join, leave, merge and partition) actually represent different strands of a single protocol. We justify this claim with an informal argument below. B A A B A B Obviously, join and leave are special cases of merge and partition, respectively. We observe that merge and partition can be collapsed into a single protocol, since, in either case, the key tree changes and remaining group members lack some number of bkeys. This prevents them from computing the new root key. In a partition, the remaining members (in any surviving group fragment) reconstruct the tree where some bkeys are missing. In case of a merge of two groups, let us suppose that a taller (deeper) tree is merged with a shorter (shallower) tree . Similar to a partition, all members formerly in construct the new tree where some bkeys – those in – are missing. (This view is symmetric since the members in see the same tree but with missing bkeys in the subtree .) We now established that both partition and merge initially result in a new key tree with a number of missing bkeys. In the first round of merge protocol, sponsor in each group broadcasts the key tree after updating its session random. Upon receiving this broadcast message, every member rebuilds a key tree which has some missing bkeys. Filling up this bkeys takes at most log2k rounds. A partition is very similar except the first broadcast message of merge. Recall that every member reconstructs the key tree after a partition in at most min(log2 p, h) rounds, where h is the tree height and p is the number of leaving members.
Protocol Unification. Although described separately in the preceding sections, the four STR operations: join, leave, merge and partition, actually represent different expression of a single protocol. We justify this claim with an informal argument below. Obviously, join and leave are special cases of merge and partition, re- spectively. It is less clear that merge and partition can be collapsed into a single protocol, because in either case, the key tree changes and the re- maining group members lack some number (sometimes none) of blinded keys or blinded session randoms which prevents them from computing the new root key. When a partition occurs, the remaining members re- construct the tree where some blinded keys are missing. In case of a merge, a shorter tree is merged into a taller tree . Any member in now can compute the group key since it knows blinded session ran- dom of any member in . The deepest member in also can compute the group key since it knows the blinded session random of any other member in and blinded group key of . Using the broadcast message any member now can compute the new group key.

Related to Protocol Unification

  • Protocols Each party hereby agrees that the inclusion of additional protocols may be required to make this Agreement specific. All such protocols shall be negotiated, determined and agreed upon by both parties hereto.

  • Protocol The attached Protocol shall be an integral part of this Agreement.

  • Quality Agreement Concurrently with execution of this Agreement, the Parties will enter into an agreement that details the quality assurance obligations of each Party with respect to the Manufacture and supply of Supplied Products under this Agreement (the “Quality Agreement”). Each Party shall perform its obligations under the Quality Agreement in accordance with the terms and conditions thereof. In the event of a conflict between the terms of the Quality Agreement and the terms of this Agreement, the provisions of the Quality Agreement shall govern.

  • Project Implementation Manual The Recipient, through the PCU, shall: (i) take all action required to carry out Parts 1.1, 1.3, 1.4, 2, 3.1(b), 3.2, 3.3 and 4 (ii) of the Project in accordance with the provisions and requirements set forth or referred to in the Project Implementation Manual; (ii) submit recommendations to the Association for its consideration for changes and updates of the Project Implementation Manual as they may become necessary or advisable during Project implementation in order to achieve the objective of Parts 1.1, 1.3, 1.4, 2, 3.1(b), 3.2, 3.3 and 4(ii) of the Project; and (iii) not assign, amend, abrogate or waive the Project Implementation Manual or any of its provisions without the Association’s prior agreement. Notwithstanding the foregoing, if any of the provisions of the Project Implementation Manual is inconsistent with the provisions of this Agreement, the provisions of this Agreement shall prevail and govern.

  • Research Use Reporting To assure adherence to NIH GDS Policy, the PI agrees to provide annual Progress Updates as part of the annual Project Renewal or Project Close-out processes, prior to the expiration of the one (1) year data access period. The PI who is seeking Renewal or Close-out of a project agree to complete the appropriate online forms and provide specific information such as how the data have been used, including publications or presentations that resulted from the use of the requested dataset(s), a summary of any plans for future research use (if the PI is seeking renewal), any violations of the terms of access described within this Agreement and the implemented remediation, and information on any downstream intellectual property generated from the data. The PI also may include general comments regarding suggestions for improving the data access process in general. Information provided in the progress updates helps NIH evaluate program activities and may be considered by the NIH GDS governance committees as part of NIH’s effort to provide ongoing stewardship of data sharing activities subject to the NIH GDS Policy.

  • Prescription Safety Glasses Prescription safety glasses will be furnished by the employer. The employer retains the authority to establish reasonable rules and procedures regarding frequency of issue, replacement of damaged glasses, limits on reimbursement costs and coordination with the employer's vision plan.

  • Musculoskeletal Injury Prevention and Control The hospital in consultation with the Joint Health and Safety Committee (JHSC) shall develop, establish and put into effect, musculoskeletal prevention and control measures, procedures, practices and training for the health and safety of employees.

  • Technical Specifications The Technical Specifications furnished on the CD are intended to establish the standards for quality, performance and technical requirements for all labor, workmanship, material, methods and equipment necessary to complete the Work. When specifications and drawings are provided or referenced by the County, these are to be considered part of the Scope of Work, and to be specifically documented in the Detailed Scope of Work. For convenience, the County supplied specifications, if any, and the Technical Specifications furnished on the CD.

  • Quality Management System Supplier hereby undertakes, warrants and confirms, and will ensue same for its subcontractors, to remain certified in accordance with ISO 9001 standard or equivalent. At any time during the term of this Agreement, the Supplier shall, if so instructed by ISR, provide evidence of such certifications. In any event, Supplier must notify ISR, in writing, in the event said certification is suspended and/or canceled and/or not continued.

  • Management of Special and Technical Environment Each certificated support person demonstrates an acceptable level of performance in managing and organizing the special materials, equipment and environment essential to the specialized programs.

Draft better contracts in just 5 minutes Get the weekly Law Insider newsletter packed with expert videos, webinars, ebooks, and more!