What is claimed is:
1. A method of reproducing information by scanning information marks, disposed with a predetermined mark pitch therebetween and recorded on tracks inside a predetermined information recording region, by an optical spot, detecting an optical change of said information marks by said scanning operation, applying signal processing to a reproducing signal obtained by said detection operation so as to reduce inter-symbol interference of an interference amount varying from one of said information marks to another of said information marks, and reproducing the information corresponding to said information mark, comprising the steps of:
a) detecting the size of the optical change resulting from said information mark;
b) calculating a plurality of equalization coefficients used for an equalization processing for the size of said optical change detected for each of said information marks; and
c) reducing said inter-symbol interference on the basis of said equalization coefficients by said equalization processing;
wherein said equalization coefficient used for said equalization processing of the size of said optical change by a first information mark of a first length to reduce said inter-symbol interference in said step c) is greater than said equalization coefficient used for said equalization processing of the size of said optical change by a second information mark of a second length which is greater than said first information mark.
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 computerized wagering game system, comprising:
a gaming module comprising gaming code which is operable to present a wagering game on which monetary value can be wagered; and
a security module operable to check the authenticity of a wagering game component using at least one of two or more available encryption keys.
2. The computerized wagering game system of claim 1, wherein the wagering game component comprises at least one of a BIOS, an operating system, a data volume, wagering game code, and a peripheral device.
3. The computerized wagering game system of claim 1, wherein at least one of the two or more available encryption keys are stored in a trusted platform module.
4. The computerized wagering game system of claim 1, wherein the two or more available encryption keys are each used to check authentication of the game component until the component is authenticated or all of the two or more available keys have been tried.
5. The computerized wagering game system of claim 1, wherein checking the authenticity of the component by using at least one encryption key comprises verifying a digital signature of the wagering game system component.
6. The computerized wagering game system of claim 5, wherein the digital signature of the wagering game system component comprises a digital signature of a hash value of a volume of data.
7. The computerized wagering game system of claim 1, wherein the authentication is performed in at least one of a pre-boot execution environment, a BIOS environment, or a booting operating system environment.
8. A method of operating a computerized wagering game system, comprising:
presenting a wagering game on which monetary value can be wagered; and
checking the authenticity of a wagering game component using at least one of two or more available encryption keys.
9. The method of operating a computerized wagering game system of claim 8, wherein checking the authenticity of a wagering game component occurs in at least one of a pre-boot execution environment, a BIOS environment, or a booting operating system environment.
10. The method of operating a computerized wagering game system of claim 8, wherein the wagering game component comprises at least one of a BIOS, an operating system, wagering game code, a peripheral device, and a data volume.
11. The method of operating a computerized wagering game system of claim 8, wherein authentication comprises using each of the two or more available encryption keys to attempt authentication of the game component until the component is authenticated or all of the two or more available keys have been tried.
12. The method of operating a computerized wagering game system of claim 8, wherein checking the authenticity of the component by using at least one encryption key comprises verifying a digital signature of the wagering game system component.
13. The method of operating a computerized wagering game system of claim 12, wherein the digital signature of the wagering game system component comprises a digital signature of a hash value of a volume of data.
14. The method of operating a wagering game system of claim 8, wherein checking the authenticity of the wagering game system component occurs in a trusted platform module.
15. The method of operating a wagering game system of claim 8, wherein the two or more available keys are stored in a trusted platform module.
16. A machine-readable medium with instructions stored thereon, the instructions when executed operable to cause a computerized wagering game system to:
present a wagering game on which monetary value can be wagered; and
check the authenticity of a wagering game component using at least one of two or more available encryption keys.
17. The machine-readable medium of claim 16, wherein checking the authenticity of a wagering game component occurs in at least one of a pre-boot execution environment, a BIOS environment, or a booting operating system environment.
18. The machine-readable medium of claim 16, wherein authentication comprises using each of the two or more available encryption keys to attempt authentication of the game component until the component is authenticated or all of the two or more available keys have been tried.
19. The machine-readable medium of claim 16, wherein confirming the authenticity of the component by using at least one encryption key comprises verifying a digital signature of the wagering game system component.
20. The machine-readable medium of claim 19, wherein the digital signature of the wagering game system component comprises a digital signature of a hash value of a volume of data.