Secure cognitive radio transmissions

1. A method for transmitting a communication, the method comprising:

detecting at least two different frequencies of one or more spectrum holes;

dividing, by other than bit-by-bit serial-to-parallel conversion, a communication into a first portion and a second portion, wherein the second portion follows the first portion within the communication in a sequential order;

selecting a first frequency and a second frequency from the detected frequencies, wherein the first and second frequencies are different from each other;

assigning the first frequency to the first portion;

assigning the second frequency to the second portion;

transmitting, via a communications device, the first portion at the first frequency assigned to the first portion; and

transmitting, via the communications device, the second portion at the second frequency assigned to the second portion.

2. The method of claim 1 , wherein the first and second frequencies are chosen randomly from the detected frequencies.

3. The method of claim 1 , wherein the first and second frequencies are chosen sequentially from the detected frequencies.

4. The method of claim 1 , wherein the first portion and the second portion are transmitted in the sequential order such that the first portion is transmitted before the second portion is transmitted.

5. The method of claim 1 , wherein the first portion and the second portion are transmitted in a non-sequential order different from the sequential order such that the second portion is transmitted before the first portion is transmitted.

6. A method for transmitting a communication, comprising:

detecting at least one frequency of one or more spectrum holes;

dividing, by other than bit-by-bit serial-to-parallel conversion, a communication into a plurality of portions including a first portion and a second portion, wherein the second portion follows the first portion within the communication in a sequential order; and

transmitting, via a communications device, the first portion and the second portion at the at least one frequency and in a non-sequential order different from the sequential order.

7. The method of claim 6 , wherein the first portion and the second portion are transmitted in a random order.

8. The method of claim 6 , wherein the plurality of portions further includes a third portion that follows the second portion within the communication in the sequential order; and

wherein transmitting, via the communications device, the first portion and the second portion at the at least one frequency and in the non-sequential order different from the sequential order comprises transmitting, via the communications device, the first portion, the second portion, and the third portion at the at least one frequency and in the non-sequential order different from the sequential order.

9. The method of claim 6 , wherein the detecting comprises detecting at least two different frequencies of the one or more spectrum holes.

10. The method of claim 9 , further comprising:

selecting a first frequency and a second frequency from the detected frequencies, wherein the first and second frequencies are different from each other;

assigning the first frequency to the first portion;

assigning the second frequency to the second portion;

transmitting, via the communications device, the first portion at the first frequency assigned to the first portion; and

transmitting, via the communications device, the second portion at the second frequency assigned to the second portion.

11. A computer program product comprising software encoded in non-transitory computer-readable media, for transmitting a communication, the software comprising instructions, operable when executed, to:

detect at least two different frequencies of one or more spectrum holes;

divide, by other than bit-by-bit serial-to-parallel conversion, a communication into a first portion, a second portion, and a third portion, wherein the third portion follows the second portion within the communication in a sequential order, and wherein the second portion follows the first portion within the communication in the sequential order;

select a first frequency, a second frequency, and a third frequency from the detected frequencies, wherein the first, second, and third frequencies are different from each other;

assign the first frequency to the first portion;

assign the second frequency to the second portion;

assign the third frequency to the third portion;

transmit, via a communications device, the first portion at the first frequency assigned to the first portion;

transmit, via the communications device, the second portion at the second frequency assigned to the second portion; and

transmit, via the communications device, the third portion at the third frequency assigned to the third portion.

12. The computer program product of claim 11 , wherein the first, second, and third frequencies are chosen randomly from the detected frequencies.

13. The computer program product of claim 11 , wherein the first, second, and third frequencies are chosen sequentially from the detected frequencies.

14. The computer program product of claim 11 , wherein the first portion, the second portion, and the third portion are transmitted in the sequential order.

15. The computer program product of claim 11 , wherein the first portion, the second portion, and the third portion are transmitted in a non-sequential order different from the sequential order.

16. A computer program product comprising software encoded in non-transitory computer-readable media, for transmitting a communication, the software comprising instructions, operable when executed, to:

detect at least one frequency of one or more spectrum holes;

divide, by other than bit-by-bit serial-to-parallel conversion, a communication into a plurality of portions including a first portion, a second portion, and a third portion, wherein the third portion follows the second portion within the communication in a sequential order, and wherein the second portion follows the first portion within the communication in the sequential order; and

transmit, via a communications device, the first portion, the second portion, and the third portion at the at least one frequency and in a non-sequential order different from the sequential order.

17. The computer program product of claim 16 , wherein the first portion, the second portion, and the third portion are transmitted in a random order.

18. The computer program product of claim 16 , wherein the instructions to transmit, via the communications device, the first portion, the second portion, and the third portion at the at least one frequency and in the non-sequential order different from the sequential order comprise instructions to transmit other portions of the plurality of portions at the at least one frequency and in the non-sequential order different from the sequential order.

19. The computer program product of claim 16 , wherein the instructions to detect the at least one frequency of the one or more spectrum holes comprise instructions to detect at least two different frequencies of the one or more spectrum holes.

20. The computer program product of claim 19 , further comprising instructions, operable when executed, to:

select a first frequency, a second frequency, and a third frequency from the detected frequencies, wherein the first, second, and third frequencies are different from each other;

assign the first frequency to the first portion;

assign the second frequency to the second portion;

assign the third frequency to the third portion;

transmit, via the communications device, the first portion at the first frequency assigned to the first portion;

transmit, via the communications device, the second portion at the second frequency assigned to the second portion; and

transmit, via the communications device, the third portion at the third frequency assigned to the third portion.