1. A method for generating an encryption key, the method comprising:
an initiator KMS receiving, from an initiator UE, one or more values used in generation of an encryption key, including obtaining at least one value associated with a RANDRi;
the initiator KMS sending the at least one value associated with the RANDRi to a responder KMS; and
the responder KMS generating the encryption key using the one or more values.
2. The method of claim 1, wherein the at least one value associated with the RANDRi is one of a Request_Init message or the RANDRi.
3. The method of claim 1, wherein the obtaining comprises receiving the at least one value associated with the RANDRi.
4. The method of claim 1, wherein the obtaining comprises generating the RANDRi.
5. A method performed by a responder KMS for generating an encryption key, the method comprising:
receiving, from an initiator KMS, one or more values used in generation of an encryption key, including obtaining at least one value associated with a RANDRi; and
generating the encryption key using the one or more values, including the at least one value associated with the RANDRi.
6. The method of claim 5, wherein the at least one value associated with the RANDRi is one of a Request_Init message or a RANDRi value.
7. The method of claim 5, wherein the obtaining comprises receiving the at least one value associated with the RANDRi.
8. The method of claim 5, wherein the obtaining comprises generating the RANDRi.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A gas turbine engine comprising:
a first spool;
a first gear system connected to and driven by the first spool;
a second spool;
a second gear system connected to and driven by the second spool;
a first starter-generator having a first shaft with splines; and
a splined collar connected to the first shaft for selectively coupling the first starter-generator to the first gear system when the splined collar is in a first position and selectively coupling the first starter-generator to the second gear system when the splined collar is in a second position.
2. The gas turbine engine of claim 1, and further comprising:
a second starter-generator connected to and driven by the second gear system.
3. The gas turbine engine of claim 1, and further comprising:
a mechanical lever connected to the splined collar for actuating the splined collar between the first and second positions.
4. The gas turbine engine of claim 1, and further comprising:
a hydraulic actuator connected to the splined collar for actuating the splined collar between the first and second positions.
5. The gas turbine engine of claim 1, wherein the first gear system and the second gear system are substantially independent.
6. The gas turbine engine of claim 1, wherein the first gear system, the second gear system, and the splined collar are positioned substantially inside a common gearbox.
7. The gas turbine engine of claim 1, wherein the first gear system has a first gear, wherein the second gear system has a second gear, and wherein the first gear, the second gear, and the splined collar are substantially concentric.
8. The gas turbine engine of claim 1, wherein the first spool is a low pressure spool and the second spool is a high pressure spool.
9. The gas turbine engine of claim 8, and further comprising:
a first tower shaft connecting the first gear system to the low pressure spool; and
a second tower shaft connecting the second gear system to the high pressure spool.
10. The gas turbine engine of claim 1, wherein the splined collar has splines on its radially outer surface for coupling to gears of the first and second gear systems.
11. A method for operating a gas turbine engine, the method comprising:
driving a first starter-generator via a first gear system connected to a first spool;
driving a second starter-generator via a second gear system connected to a second spool;
actuating a switchable coupling to disconnect the first starter-generator from the first gear system and to connect the first starter-generator to the second gear system; and
wherein actuating the switchable coupling comprises sliding a splined collar along splines of a shaft of the first starter-generator.
12. The method of claim 11, and further comprising:
starting the gas turbine engine via the first starter-generator when the switchable coupling is connected to the second gear system; and
starting the gas turbine engine via the second starter-generator when the switchable coupling is connected to the first gear system.
13. The method of claim 11, wherein actuating the switchable coupling comprises:
manually moving a lever connected the switchable coupling to move the switchable coupling.
14. The method of claim 11, wherein actuating the switchable coupling comprises:
moving a hydraulic actuator connected to the switchable coupling to move the switchable coupling.
15. The method of claim 11, wherein the switchable coupling is actuated to connect the first starter-generator to the second gear system in response to a failure of the second starter-generator.
16. The method of claim 15, wherein the switchable coupling is actuated to reconnect the first starter-generator to the first gear system in response to the second starter-generator having been repaired.
17. The method of claim 11, wherein the first spool is a low pressure spool and the second spool is a high pressure spool.
18. The method of claim 11, wherein the first gear system and the second gear system are substantially independent.