AUTHENTICATION OF CLIENT DEVICES USING MODIFIED IMAGES

• US 20180103050A1
• Filed: 10/11/2016
• Published: 04/12/2018
• Est. Priority Date: 10/11/2016
• Status: Active Grant

• Current Assignee: Salesforce.com, Inc.
• Original Assignee: Salesforce.com, Inc.
• Inventors: MASON, Paul Anthony
• Granted Patent: US 10,212,189 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 63/1416 Event detection, e.g. attack signature detection
• CPC Class Codes: H04L 63/1483 service impersonation, e.g. phishing, pharming or web spoofing detection of rogue wireless access points H04W12/12
• CPC Class Codes: H04L 63/168 above the transport layer

Abstract

Systems and methods for detecting phishing attacks and identifying attackers are described. In embodiments, a server system may modify a template image based on user information and provide the modified image to a user system with a login page. The server system may obtain authentication credentials with an image rendered by the user system. The server system may authenticate the user system based on the authentication credentials and information included in the rendered image. Other embodiments may be described and/or claimed.

Claims

1. A computer program for detection of phishing attacks, the computer program comprising a set of instructions operable to:

obtain, from the user system, a first message comprising a request for a login page and first user information associated with the user system;

modify, based on the first user information, a first image to obtain a second image;

provide, to the user system in response to the first message, a second message comprising the login page and the second image;

obtain, from the user system, a third message comprising authentication credentials, second user information, and a third image, wherein the third image is a version of the second image as rendered by the user system; and

authenticate the user system based on the second user information and third user information embedded in the third image.

2. The computer program of claim 1, wherein to modify the first image, the set of instructions is operable to:

determine a user information number based on a numeric representation of the first user information; and

one or both of;

perform a stenographic procedure on a first image to hide the user information number in a set of pixels in the first image;

or

encode the first image with the user information number during a compression operation of the first image.

3. The computer program of claim 2, wherein to perform the stenographic procedure, the set of instructions is operable to:

adjust bits located at desired bit positions in a first number to match bits of a corresponding portion of the user information number, wherein the first number with the adjusted bits is a second number, and wherein the first number is a numeric representation of the first image and the second number is a numeric representation of the second image.

4. The computer program of claim 3, wherein the desired bit positions comprises a least significant bit (LSB) of each of color value of each pixel in the set of pixels.

6. The computer program of claim 2, wherein to encode the first image with the user information number, the set of instructions is further operable to:

apply a discrete cosign transform (DCT) on a first number to obtain an array of DCT coefficients, wherein the first number is a numeric representation of the first image; and

adjust bits located at desired bit positions in each of the DCT coefficients to match bits of a corresponding portion of the user information number, wherein the array with the adjusted DCT coefficients is a second number, and wherein the second number is a numeric representation of the second image.

7. The computer program of claim 6, wherein the desired bit positions are an LSB position of each of the DCT coefficients.

8. The computer program of claim 1, wherein to authenticate the user system, the set of instructions is operable to:

extract the second user information from the third message;

extract the third user information from the third image; and

determine whether the second user information matches the third user information.

9. The computer program of claim 8, wherein to extract third user information from the third image, the set of instructions is operable to:

identify desired bit positions within a numeric representation of the third image;

obtain numerals located at the desired bit positions;

group the removed numerals together to obtain a numeric representation of the third user information; and

convert the numeric representation of the third user information into the third user information.

10. The computer program of claim 9, wherein the set of instructions is further operable to:

encrypt the user information number,

wherein to perform the stenographic procedure, the set of instructions is further operable to hide the encrypted user information number in the set of pixels,

wherein to encode the first image, the set of instructions is further operable to encode the first image with the encrypted user information number during the compression operation, and

wherein to authenticate the user system, the set of instructions is further operable to decrypt the numeric representation of the third user information to obtain the third user information.

11. The computer program of claim 1, wherein

the user information comprises one or more of an internet IP address of the user system, an operating system (OS) implemented by the user system, a version of the OS, a browser used to send the request, a version of the browser, a browser window size, a rendering engine implemented by the browser, a version of the rendering engine, a time that the request was submitted, a time zone in which the user system is located, a screen resolution of the user system, and a device type of the user system, and

the authentication credentials comprise one or more of a user name, a password, a personal identification number (PIN), a digital certificate, and biometric data.

12. A computer program to authenticate a user system, the computer program comprising a set of instructions operable to:

provide, to a server system, a first message to request a login page, wherein the first message comprises user information associated with the user system;

obtain, from the server system in response to the request message, a second message comprising the login page with a user-specific image, wherein the user-specific image is a version of a template image that is modified based on the user information, and wherein the user-specific image has a color scheme that is different and imperceptible than a color scheme of the template image;

render, in an application container implemented by the user system, the login page and the user-specific image; and

provide, to the server system via an interface of the login page, a third message comprising authentication credentials and a rendered image, wherein the rendered image is a version of the user-specific image as rendered in the application container.

13. The computer program of claim 12, wherein the third message further comprises second user information, and the user system is to be authenticated based on the second user information and third user information embedded in the rendered image.

14. The computer program of claim 13, wherein the set of instructions is operable to:

obtain, from the server system, a homepage to be rendered in the application container upon proper authentication of the user system.

15. The computer program of claim 12, wherein the template image comprises a plurality of pixels, wherein each pixel of the plurality of pixels has a corresponding color value, and the set of instructions is further operable to:

convert the rendered image into a number according to instructions included in the login page;

encrypt the number; and

insert the encrypted number in the third message.

16. A server system comprising:

a communications system to;

obtain, from a user system, a first message to request a login page with first user information,

send, to the user system in response to the request, a second message including the login page and a user-specific image, wherein the user-specific image is a modified version of a template image based on the first user information, and

obtain, from the user system, a third message including authentication credentials, a rendered image, and second user information, wherein rendered image is a version of the user-specific image as rendered by the user system; and

a processor system to;

generate the user-specific image by modification of the template image to include the first user information, wherein the user-specific image has a color scheme that is different and imperceptible than a color scheme of the template image,

extract second user information from the third message, and extract third user information from the rendered image, and

authenticate the user system based on the authentication credentials and the second and third user information.

17. The server system of claim 17, wherein to modify the template image, the processor system is to:

determine a user information number based on a numeric representation of the first user information;

encrypt the user information number; and

one or both of;

perform a stenographic procedure on the template image to hide the encrypted user information number in a set of pixels of the template image;

or

encode the template image with the encrypted user information number during a compression operation of the template image.

18. The server system of claim 17, wherein to perform the stenographic procedure, the processor system is to:

determine a numeric representation of the template image;

adjust bits located at desired bit positions in the numeric representation of the template image to match bits of a corresponding portion of the encrypted user information number; and

generate the user-specific image using the numeric representation of the template image with the adjusted bits as a color scheme.

19. The server system of claim 17, wherein to encode the first image with the user information number, the set of instructions is further operable to:

split the template image into a plurality of blocks;

determine a numeric representation of each block of the plurality of blocks;

perform a discrete cosign transform (DCT) on each block to obtain an array of DCT coefficients;

adjust bits located at desired bit positions in each of the DCT coefficients to match bits of a corresponding portion of the encrypted user information number; and

generate the user-specific image by performance of a quantization operation and an entropy encoding operation on the array of with the adjusted DCT coefficients.

20. The server system of claim 17, wherein to authenticate the user system, the processor system is to:

identify desired bit positions within a numeric representation of the rendered image;

identify numerals located at the desired bit positions;

group the identified numerals together to obtain a numeric representation of third user information;

decrypt the numeric representation of the third user information to obtain the third user information; and

determine whether the third user information matches the second user information.