MORE SECURE IMAGE-BASED "CAPTCHA" TECHNIQUE

• US 20130347090A1
• Filed: 05/26/2011
• Published: 12/26/2013
• Est. Priority Date: 05/26/2011
• Status: Active Grant

• Current Assignee: More Secure Image-Based "Captcha" Technique
• Original Assignee: More Secure Image-Based "Captcha" Technique
• Inventors: Foote, Evan Michael
• Granted Patent: US 9,075,983 B2
• Time in Patent Office: Days
• US Class Current: 726/7
• CPC Class Codes: G06F 21/31 User authentication
• CPC Class Codes: G06F 21/36 by graphic or iconic representation
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04L 63/083 using passwords cryptographic mechanisms or cryptographic arrangements for entity authentication using a predetermined code H04L9/3226
• CPC Class Codes: H04L 63/1408 by monitoring network traffic monitoring network traffic per se H04L43/00

Abstract

A more secure CAPTCHA makes use of a distorted alphanumeric character string or strings that include one or more glyphs, pictures or symbols foreign to a target audience. Adding at least one of a glyph, picture or symbol makes recognition of the distorted string trivial since humans who would know which of the character set to expect, but a very difficult decision for a computer already struggling to decide where a character begins and ends, let alone identifying the character as being valid.

Claims

1. A method for authorizing access, comprising the step of:

generating for display at least one distorted string of alphanumeric characters, in combination with at least one of a glyph, picture or symbol, the glyph, picture or symbol being foreign to a target audience; and

comparing a response of a user entered to in reaction to the distorted string of alphanumeric characters to a reference string of characters to determine whether to grant access.

2. The method according to claim 1 wherein the generating for display step further comprises the steps of:

generating a random background; and

combining the random background with the at least one string of random alphanumeric characters that includes at least one of the glyph, picture or symbol, using a random template.

3. The method according to claim 1 wherein the at least one string of random alphanumeric characters comprises at least one word.

4. The method according to claim 2 wherein the random background has one or more randomly selected colors, shapes, features and/or textures.

5. The method according to claim 2 further including the step of obfuscating the at least one string of random alphanumeric characters that includes at least one of the glyph, picture or symbol, using a random template.

6. The method according to claim 5 wherein the obfuscating step includes mixing the background and the at least one random alphanumeric string.

7. A method for authorizing access, comprising the step of:

generating for display at least one distorted string of alphanumeric characters, in combination with at least one of a glyph, picture or symbol, the glyph, picture or symbol being foreign to a target audience, the generating step including;

generating a random background and

combining the random background with the at least one string of random alphanumeric characters that includes at least one of the glyph, picture or symbol, using a random template; and

comparing a response of a user entered to in reaction to the distorted string of alphanumeric characters to a reference string of characters to determine whether to grant access.

8. The method according to claim 7 wherein the at least one string of random alphanumeric characters comprises at least one word.

9. The method according to claim 7 wherein the random background has one or more randomly selected colors, shapes, features and/or textures.

10. The method according to claim 7 further including the step of obfuscating the at least one string of random alphanumeric characters that includes at least one of the glyph, picture or symbol, using a random template.

11. The method according to claim 10 wherein the obfuscating step includes mixing the background and the at least one random alphanumeric string.