Member Leave Protocol Sample Clauses

Member Leave Protocol. When a Member Leave event happens, the key tree should be modified and some keys should be replaced for forward secrecy. Upon receiving the leaving message, all the members in the group will update the key tree accordingly and decide on a sponsor. Suppose a member Uc is leaving the group. Upon receiving the member leaving request, all the members in the group will agree on a sponsor and update the key tree as follows. If the parent node of the member node originally assigned to the leaving member has more than two child nodes, than the member node assigned to the leaving member is removed directly, and the sponsor is the member associated with the rightmost remaining child node under the deleted member node's parent node. Otherwise, if the parent node of the member node assigned to the leaving member has only two child nodes, after the removal of the member node assigned to the leaving member, there is only one child node left. The member associated with this solitary node is promoted and re-associated with its parent node and will be the sponsor; this solitary node is no more necessary and is removed too. After updating the key tree, the sponsor, who knows all the necessary keys, will stand out and be responsible for the key refreshing. The sponsor computes and updates all the blinded keys and union blinded keys of the nodes on its key path. Then, the sponsor will broadcast these refreshed keys to all of the group members. After receiving the broadcast message, each legitimate member in the group can derive all the key generation keys on his/her key path, and all the legitimate members can obtain the same new group key. For example, as shown in Figure 4, there are thirteen members in this group and the member U7
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Member Leave Protocol. We again have a group of n members when a member Md ( d ≤ n ) leaves the group. If d > 1, the sponsor Ms is the leaf node directly below the leaving member, i.e., M d– 1. Otherwise, the sponsor is M 2 . Upon hearing about the leave event from the group communication system, each remaining member updates its key tree by deleting the nodes LN〈d 〉 corresponding to Md and its parent node IN〈d〉 . The nodes above the leaving node are also renumbered. The former sibling IN〈d –1 〉 of Md is promoted to replace (former) Md ’s parent. The sponsor Ms selects a new secret session random, computes all keys (and blinded keys) up to the root, and broadcasts BT〈s〉 to the group. This information allows all members to recompute the new group key. In summary, the leave protocol takes one communication round and involves a single broadcast. The cryptographic cost varies depending on two factors: 1) the position of the departed member, and 2) the position of the remaining member who needs to compute the new key. The total number of serial cryptographic operations in the leave protocol can be expressed as (assuming n is the original group size): ■ 2(n – d ) + 1 + ( n – d ) + 1 = 3n – 3d + 2 when d > 2 ■ 3n – 7 when d = 1,2 In the worst case, M1 or M 2 leave the group. The cost for this leave operation is equal to the leave of member M3, which is 3n – 7. The average leave cost is 3n /2 + 2. The leave protocol provides forward secrecy since a former member cannot compute the new key owing to the sponsor’s changing the session random. The protocol also provides key independence since knowledge of the new key cannot be used to derive the previous keys; this is, again, due to the sponsor refreshing its session random.
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Related to Member Leave Protocol

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  • Catastrophic Leave Program Leave credits, as defined below, may be transferred from one (1) or more employees to another employee, on an hour-for-hour basis, in accordance with departmental policies upon the request of both the receiving employee and the transferring employee and upon approval of the employee's appointing authority, under the following conditions: A. The receiving employee is required to be absent from work due to injury or the prolonged illness of the employee, employee's spouse, registered domestic partner, a domestic partner listed on an “Affidavit for Enrollment of Domestic Partners,” submitted to employee benefits, parent or child, has exhausted all earned leave credits, including but not limited to sick leave, compensatory time, holiday credits and disability leave and is therefore facing financial hardship. B. The transfers must be for a minimum of four (4) hours and in whole hour increments thereafter. C. Transfers shall be allowed to cross-departmental lines in accordance with the policies of the receiving department. D. The total maximum leave credits received by an employee shall normally not exceed five hundred twenty (520) hours; however, if approved by his/her appointing authority, the total leave credits may be up to one thousand forty (1,040) hours. Total leave credits in excess of one thousand forty (1,040) hours will be considered on a case-by-case basis by the appointing authority subject to the approval of the Chief Administrative Officer. E. The transfers are irrevocable, and will be indistinguishable from other leave credits belonging to the receiving employee. Transfers will be subject to all taxes required by law. F. Leave credits that may be transferred under this program are defined as the transferring employee’s vacation credits or up to twenty-four (24) hours of sick leave per fiscal year. G. Transfers shall be administered according to the rules and regulations of the Auditor and Controller, and made on a form prescribed by the Auditor and Controller. Approvals of the receiving and donating employee, the donating employee's appointing authority and the receiving employee's appointing authority (in the case of an interdepartmental transfer) will be provided for on such form. H. This program is not subject to the Grievance Procedure of this Agreement.

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