초록 ▼

Use of an electronic design in a configurable device is controlled by a secure device. The configurable device includes an authorization code generator having a sequence generator and an encryption core implementing an encryption algorithm. The secure device uses the same sequence generator and encr

Use of an electronic design in a configurable device is controlled by a secure device. The configurable device includes an authorization code generator having a sequence generator and an encryption core implementing an encryption algorithm. The secure device uses the same sequence generator and encryption core in its own authorization code generator. The sequence generators in the configurable device and secure device generate identical streams of values that are encrypted using the encryption algorithm. The encrypted values are compared in the configurable device by a comparator. When the streams of encrypted values are not identical, the electronic design is prevented from operating. Where the period of the sequence generated by the sequence generators is long, such as 264, the output of the encryption cores will contain that many different encrypted values, a substantial amount of highly randomized output used as authorization code for the protection of the electronic design.

대표청구항 ▼

1. A method comprising: receiving at a configurable device a configuration of a protection circuit, wherein the protection circuit is a portion of the configurable device after the configurable device is configured;receiving at the configurable device a plurality of secure device encrypted sequence

1. A method comprising: receiving at a configurable device a configuration of a protection circuit, wherein the protection circuit is a portion of the configurable device after the configurable device is configured;receiving at the configurable device a plurality of secure device encrypted sequence values, the secure device encrypted sequence values generated by a secure device authorization code generator that is separate from the configurable device;generating a plurality of configurable device encrypted sequence values, wherein said generating is performed by the protection circuit of the configured configurable device; andcomparing the plurality of secure device encrypted sequence values with the plurality of configurable device encrypted sequence values; andfurther comprising enabling operation of an electronic design when the plurality of secure device encrypted sequence values are identical to the plurality of configurable device encrypted sequence values. 2. The method of claim 1 further comprising disabling operation of an electronic design when the plurality of secure device encrypted sequence values are not identical to the plurality of configurable device encrypted sequence values. 3. The method of claim 1, wherein the configurable device comprises a programmable logic device. 4. The method of claim 1 further comprising: generating a plurality of configurable device sequence values, wherein said generating is performed using the protection circuit; andencrypting the plurality of configurable device sequence values to generate the plurality of configurable device encrypted sequence values. 5. The method of claim 1 further comprising receiving a configuration of an electronic design, wherein the electronic design is a portion of the configurable device. 6. A configurable device comprising: a protection circuit configurable using configuration data received from a memory device, wherein the protection circuit is operable to generate a plurality of configurable device encrypted sequence values; anda comparator operable to compare a plurality of secure device encrypted sequence values with the plurality of configurable device encrypted sequence values generated by the protection circuit of the configured configurable device, wherein the plurality of secure device encrypted sequence values are generated by a secure device authorization code generator that is separate from the configurable device: andfurther comprising: an electronic design; andan enabling circuit operable to enable an operation of the electronic design when the plurality of secure device encrypted sequence values is identical to the plurality of configurable device encrypted sequence values. 7. The configurable device of claim 6 further comprising: a circuit operable to disable an operation of the electronic design when the plurality of configurable device encrypted sequence values is not identical to the plurality of secure device encrypted sequence values. 8. The configurable device of claim 6, wherein the configurable device is a programmable logic device. 9. The configurable device of claim 6 further comprising: a configurable device sequence generator operable to generate a plurality of configurable device sequence values; anda configurable device encryption core operable to encrypt the plurality of configurable device sequence values to generate the plurality of configurable device encrypted sequence values. 10. The configurable device of claim 9, wherein the configurable device sequence generator comprises a counter, a linear feedback shift register, or a pseudo-random number generator. 11. The configurable device of claim 9, wherein the configurable device encryption core is operable to apply an Advanced Encryption Standard (AES), a Data Encryption Standard (DES), or triple DES to generate the plurality of configurable device encrypted sequence values. 12. The configurable device of claim 6 further comprising an electronic design wherein the electronic design is configurable from configuration data received from a memory device. 13. A system comprising: a protection circuit of a configurable device configurable using configuration data received from a memory device, wherein the protection circuit is operable to generate a plurality of configurable device encrypted sequence values;a secure device authorization code generator operable to generate a plurality of secure device encrypted sequence values, wherein the secure device authorization code generator is separate from the configurable device; anda comparator operable to compare the plurality of secure device encrypted sequence values with the plurality of configurable device encrypted sequence values: andwherein the configurable device comprises: an electronic design; andan enabling circuit operable to enable an operation of the electronic design when the plurality of secure device encrypted sequence values is identical to the plurality of configurable device encrypted sequence values. 14. The system of claim 13 wherein the configurable device further comprises: a circuit operable to disable an operation of the electronic design when the plurality of configurable device encrypted sequence values is not identical to the plurality of secure device encrypted sequence values. 15. The system of claim 13, wherein the configurable device is a programmable logic device. 16. The system of claim 13, wherein the configurable device comprises: a configurable device sequence generator operable to generate a plurality of configurable device sequence values; anda configurable device encryption core operable to encrypt the plurality of configurable device sequence values to generate the plurality of configurable device encrypted sequence values,wherein the secure device authorization code generator comprises: a secure device sequence generator operable to generate a plurality of secure device sequence values; anda secure device encryption core operable to encrypt the plurality of secure device sequence values to generate the plurality of secure device encrypted sequence values. 17. The system of claim 16, wherein the configurable device sequence generator comprises a counter, a linear feedback shift register, or a pseudo-random number generator, and wherein the secure device sequence generator comprises a counter, a linear feedback shift register, or a pseudo-random number generator. 18. The system of claim 16, wherein the configurable device encryption core is operable to apply an Advanced Encryption Standard (AES), a Data Encryption Standard (DES), or triple DES to generate the plurality of configurable device encrypted sequence values, and wherein the secure device encryption core is operable to apply an AES, a DES, or triple DES to generate the plurality of secure device encrypted sequence values.