Time code telephone security access system
First Claim
1. A security access control system for controlling access of users to an information processing system, said security access control system comprising:
- a plurality of remote terminals each comprising a signal generating means for generating a coded identification signal and a transmitting means for transmitting said coded identification signal;
a base terminal comprising a receiving means for receiving said coded identification signals, a signal processing means for decoding and determining the validity of each of said coded identification signal, and an access control means for controlling access to said information processing system;
each of said coded identification signals generated by said signal generating means of said remote terminal comprising a sequence of a predetermined number of alphanumeric digits, a first group of said alphanumeric digits comprising a time code and a second group of said alphanumeric digits comprising an address code;
said time code changing periodically in a predetermined manner;
said address code remaining essentially constant over time;
each of said signal generating means comprising a first time code memory means containing a first predetermined sequence of time codes, and a first clock means for selecting a first time code from said first sequence of time codes contained in said first time code memory means;
said signal processing means of said base terminal comprising a second time code memory means containing a second predetermined sequence of time codes and a second clock means; and
said signal processing means further comprising first comparator means for comparing said time code component of said incoming identification signal with a second time code selected according to the time indicated by said second clock means from said second time code memory means;
whereby said base terminal denies access to said information processing system if said time code component of said incoming identification signal and said second time code are not identical.
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Accused Products
Abstract
The present invention comprises a novel means of controlling access to long distance telephone services or other information processing systems through the use of time dependent user ID numbers. The ID number of the present invention contains a fixed portion, and a changing portion that changes over time in a predetermined manner. Unless the fixed and changing portions of an incoming ID number received from a user attempting to gain access to the secured system are both correct, access is denied. The invention also includes a multi-use detector that determines if a valid ID number is used simultaneously by two different users.
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Citations
18 Claims
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1. A security access control system for controlling access of users to an information processing system, said security access control system comprising:
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a plurality of remote terminals each comprising a signal generating means for generating a coded identification signal and a transmitting means for transmitting said coded identification signal; a base terminal comprising a receiving means for receiving said coded identification signals, a signal processing means for decoding and determining the validity of each of said coded identification signal, and an access control means for controlling access to said information processing system; each of said coded identification signals generated by said signal generating means of said remote terminal comprising a sequence of a predetermined number of alphanumeric digits, a first group of said alphanumeric digits comprising a time code and a second group of said alphanumeric digits comprising an address code; said time code changing periodically in a predetermined manner; said address code remaining essentially constant over time; each of said signal generating means comprising a first time code memory means containing a first predetermined sequence of time codes, and a first clock means for selecting a first time code from said first sequence of time codes contained in said first time code memory means; said signal processing means of said base terminal comprising a second time code memory means containing a second predetermined sequence of time codes and a second clock means; and said signal processing means further comprising first comparator means for comparing said time code component of said incoming identification signal with a second time code selected according to the time indicated by said second clock means from said second time code memory means; whereby said base terminal denies access to said information processing system if said time code component of said incoming identification signal and said second time code are not identical. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for verifying the authenticity of incoming identification signals received by an access control means of a secured information processing system to prevent access by unauthorized users to said system, said verification method comprising the steps of:
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providing each of a plurality of authorized users of said system with a unique, multi-digit alphanumeric address code; providing each of said authorized users with a predetermined sequence of multi-digit alphanumeric time codes, each time code corrresponding to different period of time; providing each of said authorized users with a means for combining said address code and said time code in a predetermined pattern; dividing an incoming identification signal into time code portions and address code portions corresponding to said predetermined patterns; comparing said address code portion of said incoming identification signal to a list of valid address codes of authorized users; rejecting said incoming identification signal as invalid if said address code portion of said incoming identification signal is not identical to any of said valid address codes; comparing said time code portion of said incoming identification signal to the time code corresponding to the time at which said incoming identification signal is received; and rejecting said incoming identification signal as invalid if said time code portion of said incoming identification signal is not identical to said corresponding time code. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification