US5465387A
Expired / Lapsed
US
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Adaptive fraud monitoring and control
Assignee: AT&T Inc
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Filing: 1993-10-08
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Granted: 1995-11-07
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Expires: 2013-10-08
Abstract
Abstract Access to a resource such as a telecommunications system is monitored and prevented adaptively on a real-time basis by establishing with the customer, a steady state low level of surveillance and arbitrary intermittent interruption during which the telecommunications company demands authentication, by personal identification number (PIN), of a given fraction of access demands (for example, telephone calls), and, in response to signals indicating that arrival of an alert condition, and preferably at least one prior invalid call, raising the level of authentication demands.
Inventors
- 👤 Arabinda Mukherjee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:56
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/38; H04M15/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
60 words
The method of monitoring access to a system, comprising: establishing a rate of interruption for demanding authentication from a potential accessor; denying access in the event of failure to authenticate in response to each demand; and automatically varying the rate of interruption to a another rate in response to predetermined conditions; one of the predetermined conditions including prior failed authentications.
Claim 2
Independent Claim
60 words
The method of monitoring access to a system, comprising: establishing a rate of interruption for demanding authentication from a potential accessor; denying access in the event of failure to authenticate in response to each demand; and automatically varying the rate of interruption to a another rate in response to predetermined conditions; one of the predetermined conditions including prior failed authentications.
Claim 3
Dependent Claim
22 words
The method as in claim 1, wherein the rate of interruption is varied on the basis of the rate of failed authentications.
Claim 4
Dependent Claim
21 words
The method as in claim 1, wherein a further one of the predetermined conditions is an alert condition related to time.
Claim 5
Independent Claim
82 words
The method of monitoring access to a system, comprising: establishing a rate of interruption for demanding authentication from a potential accessor; denying access in the event of failure to authenticate in response to each demand; and automatically varying the rate of interruption to a another rate in response to predetermined conditions; the step of establishing a rate of interruption including determining whether calls are suspicious and determining the rate of interruptions on the basis of only the rate of failed suspicious calls.
Claim 6
Independent Claim
82 words
The method of monitoring access to a system, comprising: establishing a rate of interruption for demanding authentication from a potential accessor; denying access in the event of failure to authenticate in response to each demand; and automatically varying the rate of interruption to a another rate in response to predetermined conditions; the step of establishing a rate of interruption including determining whether calls are suspicious and determining the rate of interruptions on the basis of only the rate of failed suspicious calls.
Claim 7
Dependent Claim
41 words
The method as in claim 4, wherein automatically varying the rate of interruption to a another rate includes determining the rate of failed authentication demands and adjusting the rate of interruption on the basis of the rate of failed authentication demands.
Claim 8
Dependent Claim
32 words
The method as in claim 1, wherein the established rate of interruption is P, where P is equal to any value of from 0 to 1.0 and each 1/P-th call is interrupted.
Claim 9
Dependent Claim
59 words
The method as in claim 1, wherein the step of varying the rate of interruptions includes raising the rate of interruptions if the number of authentication failures exceeds a given number over a period of time, and decreasing the rate of interruptions if the number of authentication failures is less than a given amount over a period of time.
Claim 10
Dependent Claim
22 words
The method as in claim 1, wherein predetermined conditions include an alert condition related to time and the number of failed authentications.
Claim 11
Dependent Claim
35 words
The method as in claim 1, wherein the step of varying the rate of interruptions includes setting three default rates, and varying between the three rates on the basis of the rate of failed authentications.
Claim 12
Independent Claim
67 words
An apparatus for monitoring access to a system, comprising: means for establishing a rate of interruption for demanding authentication from a potential accessor; means for denying access in the event of failure to authenticate in response to each demand; and means for varying the rate of interruption to another in response to predetermined conditions selected by the customer, one of the predetermined conditions including prior failed authentications.
Claim 13
Independent Claim
67 words
An apparatus for monitoring access to a system, comprising: means for establishing a rate of interruption for demanding authentication from a potential accessor; means for denying access in the event of failure to authenticate in response to each demand; and means for varying the rate of interruption to another in response to predetermined conditions selected by the customer, one of the predetermined conditions including prior failed authentications.
Claim 14
Dependent Claim
28 words
An apparatus as in claim 10, wherein the means for varying the rate of interruption includes means for varying on the basis of the rate of failed authentications.
Claim 15
Dependent Claim
19 words
An apparatus as in claim 10, wherein one to the predetermined conditions is an alert condition related to time.
Claim 16
Independent Claim
93 words
An apparatus for monitoring access to a system, comprising: means for establishing a rate of interruption for demanding authentication from a potential accessor; means for denying access in the event of failure to authenticate in response to each demand; and means for varying the rate of interruption to another in response to predetermined conditions selected by the customer, the means for establishing a rate of interruption including means for determining whether calls are suspicious and means for determining the rate of interruptions on the basis of only the rate of failed suspicious calls.
Claim 17
Independent Claim
93 words
An apparatus for monitoring access to a system, comprising: means for establishing a rate of interruption for demanding authentication from a potential accessor; means for denying access in the event of failure to authenticate in response to each demand; and means for varying the rate of interruption to another in response to predetermined conditions selected by the customer, the means for establishing a rate of interruption including means for determining whether calls are suspicious and means for determining the rate of interruptions on the basis of only the rate of failed suspicious calls.
Claim 18
Dependent Claim
48 words
An apparatus as in claim 13, wherein the means for automatically varying the rate of interruption to a another rate includes means for determining the rate of failed authentication demands and means for adjusting the rate of interruption on the basis of the rate of failed authentication demands.
Claim 19
Dependent Claim
32 words
An apparatus as in claim 10, wherein the established rate of interruption is P, where P is equal to any value of from 0 to 1.0 and each 1/P-th call is interrupted.
Claim 20
Dependent Claim
61 words
An apparatus as in claim 10, wherein the means for varying the rate of interruptions includes means for raising the rate of interruptions if the number of authentication failures exceeds a given number over a period of time, and decreasing the rate of interruptions if the number of authentication failures is less than a given amount over a period of time.
Claim 21
Dependent Claim
23 words
An apparatus as in claim 10, wherein further predetermined conditions include an alert condition related to time and the number of failed authentications.
Claim 22
Dependent Claim
39 words
An apparatus as in claim 10, wherein the means for varying the rate of interruptions includes means for setting three default rates, and means for varying between the three rates on the basis of the rate of failed authentications.
Claim 23
Dependent Claim
37 words
The method as in claim 1, wherein the step of establishing a rate of interruption includes determining whether calls are suspicious and determining the rate of interruptions on the basis of the rate of failed suspicious calls.
Claim 24
Dependent Claim
41 words
The method as in claim 19, wherein automatically varying the rate of interruption to a another rate includes determining the rate of failed authentication demands and adjusting the rate of interruption on the basis of the rate of failed authentication demands.
Claim 25
Dependent Claim
41 words
An apparatus as in claim 10, wherein the means for establishing a rate of interruption includes means for determining whether calls are suspicious and means for varying the rate of interruptions on the basis of the rate of failed suspicious calls.
Claim 26
Dependent Claim
47 words
An apparatus as in claim 21, wherein the means for automatically varying the rate of interruption to another rate includes means for determining the rate of failed authentication demands and means for adjusting the rate of interruption on the basis of the rate of failed authentication demands.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-11-06 | 1999-05-08 | 1999-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-06 | 2003-05-08 | 2003-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-06 | 2007-05-08 | 2007-11-07 | $7700.00 | Window Closed / Lapsed |