System and method for filtering message

• US 7,725,550 B2
• Filed: 12/16/2005
• Issued: 05/25/2010
• Est. Priority Date: 12/17/2004
• Status: Active Grant

• Current Assignee: NHN Corporation
• Original Assignee: NHN Corporation
• Inventors: Choi, Sung-Wone
• Primary Examiner(s): Meky; Moustafa M
• Application Number:
  US11/793,373
• Publication Number:
  US 20080263159A1
• Time in Patent Office: 1,621 Days
• Field of Search: 709200-206, 709217-219
• US Class Current: 709/206
• CPC Class Codes: H04L 51/04 Real-time or near real-time messaging, e.g. instant messaging [IM]
• CPC Class Codes: H04L 51/212 using filtering or selective blocking
• CPC Class Codes: H04L 67/565 Conversion or adaptation of application format or content adding application control or application functional data H04L67/561

Abstract

A system and method for message filtering are disclosed. A conversion target letter table is generated which stores information on letters that may be used to elude filtering, the table storing the hex code information of each letter that may be used for eluding filtering and the conversion letter information regarding the conversion letter to which each letter is to be converted. A hex code of a message text inputted by a user is compared with the hex codes of the table, and when a conversion target letter is included, it is converted to the conversion letter stored in the conversion target table associated with the letter. When the conversion is completed, it is determined whether or not pre-configured prohibited words are included in the converted message; and message filtering is performed.

Claims

1. A method of filtering messages, comprising the steps of:

(a) generating a conversion target letter table storing hex code information corresponding to each conversion target letter that may be used for eluding filtering and conversion letters corresponding to each of the conversion target letters;

(b) comparing a hex code of a letter of a message text inputted by a user with the hex code information stored in the conversion target letter table;

(c) when the hex code matches any one of the hex code information stored in the conversion target letter table, converting the letter to the corresponding conversion letter stored in the conversion target letter table;

(d) repeating the steps (b) and (c) for all of letters of the message text so as to create a converted message text; and

(e) when a pre-configured prohibited word or words are included in the converted message text, filtering the converted message text.

2. The method of claim 1, wherein the message text includes at least one selected from the group consisting of a memo message, an instant message, a mail message, and a message post for a bulletin board.

3. The method of claim 1, wherein the letters for eluding filtering stored in the conversion target letter table include at least one selected from the group consisting of symbols, phonetic signs, and loanwords.

4. The method of claim 1, wherein the step (e) comprises performing string matching to determine whether or not a prohibited word or words are included in the converted message text.

5. The method of claim 1, wherein the filtering comprises blocking the transmission of the message text to a specified user, when the message text is a memo message, an instant message or a mail message.

6. The method of claim 1, wherein the filtering comprises blocking the registration of the message text on a bulletin board, when the message text is a message post.

7. The method of claim 1, wherein when the message text is a mail message, the steps (b) and (c) are performed on title or content of the mail message,

and the filtering further comprises blocking storage of the mail message in a mail box or storing the mail message in a spam mail folder.

8. A message filtering system, comprising:

a conversion target letter table for storing hex code information corresponding to each conversion target letter that may be used for eluding filtering and conversion letters corresponding to each of the conversion target letters;

a character matching module for comparing a hex code of letter of a message text inputted by a user with the hex code information stored in the conversion target letter table;

a letter conversion module for converting, when the hex code matches any one of the hex code information stored in the conversion target letter table, the letter to the corresponding conversion letter stored in the conversion target letter table so as to create a converted message text; and

a filtering module for filtering, when a pre-configured prohibited word or words are included in the converted message text, the converted message text.

9. The message filtering system of claim 8, wherein the message text includes at least one selected from the group consisting of a memo message, an instant message, a mail message, and a message post for a bulletin board.

10. The message filtering system of claim 8, wherein the letters for eluding filtering stored in the conversion target letter table include at least one selected from the group consisting of symbols, phonetic signs, and loanwords.

11. The message filtering system of claim 8, wherein the filtering module performs string matching to determine whether or not a prohibited word or words are included in the converted message text.

12. A mobile terminal for performing filtering of short messages edited using special characters, comprising:

a conversion target letter table for storing hex code information corresponding to each conversion target letter that may be used for eluding filtering and conversion letters corresponding to each of the conversion target letters;

a character matching module for comparing a hex code of a letter of a message text inputted by a user with the hex code information stored in the conversion target letter table;

a letter conversion module for converting, when the hex code matches any one of the hex code information stored in the conversion target letter table, the letter to the corresponding conversion letter stored in the conversion target letter table so as to create a converted message text; and

a filtering module or filtering, when a pre-configured prohibited word or words are included in the converted message text, the converted message text.

13. A method of filtering short messages in a mobile communication system at a short message service center, comprising the steps of:

(a) generating a conversion target letter table storing hex code information corresponding to each conversion target letter that may be used for eluding filtering and conversion letters corresponding to each of the conversion target letters;

(b) comparing a hex code of a letter of a message text inputted by a user with the hex code information stored in the conversion target letter table;

(c) when the hex code matches any one of the hex code information stored in the conversion target letter table, converting the letter to the corresponding conversion letter stored in the conversion target letter table;

(d) repeating the steps (b) and (c) for all of letters of the message text so as to create a converted message text; and

(e) when a pre-configured prohibited word or words are included in the converted message text, filtering the converted message text.