Method and apparatus for verifying secure document timestamping
First Claim
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1. A method comprising:
- receiving a timestamp from a caller via a telephone connection;
receiving a device identifier from the caller, in which the device identifier identifies a device;
determining a cryptographic key based on the device identifier;
determining a representation of a time based on the timestamp and the cryptographic key;
providing the representation of the time to the caller;
determining an account; and
charging a fee to the account.
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Abstract
According to one embodiment of the invention, a method is provided for receiving a timestamp from a caller via a telephone connection; receiving a device identifier from the caller, in which the device identifier identifies a device; determining a cryptographic key based on the device identifier; determining an indication of a time based on the timestamp and the cryptographic key; providing the indication of the time to the caller; determining an account; and charging a fee to the account.
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Citations
24 Claims
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1. A method comprising:
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receiving a timestamp from a caller via a telephone connection;
receiving a device identifier from the caller, in which the device identifier identifies a device;
determining a cryptographic key based on the device identifier;
determining a representation of a time based on the timestamp and the cryptographic key;
providing the representation of the time to the caller;
determining an account; and
charging a fee to the account. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method comprising:
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receiving a sequence of DTMF signals from a caller via a telephone connection;
determining a timestamp based on the DTMF signals;
receiving a device identifier from the caller, in which the device identifier identifies a device;
determining a cryptographic key based on the device identifier;
determining a representation of a time based on the timestamp and the cryptographic key;
providing the representation of the time to the caller;
determining an account; and
charging a fee to the account.
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24. A method comprising:
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receiving a timestamp from a timestamp recipient via an Internet connection;
receiving a device identifier via the Internet connection, in which the device identifier identifies a device;
determining a cryptographic key based on the device identifier;
determining a representation of a time based on the timestamp and the cryptographic key;
providing the representation of the time to the timestamp recipient via the Internet connection;
determining an account; and
charging a fee to the account.
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Specification