CN100435591C

CN100435591C - A method for implementing invisible character transmission on short message communication platform

Info

Publication number: CN100435591C
Application number: CNB2003101177180A
Authority: CN
Inventors: 韦昌荣; 陈从华; 王余良; 余建成; 高洪君
Original assignee: Xiamen Yaxon Networks Co Ltd
Current assignee: Xiamen Yaxon Networks Co Ltd
Priority date: 2003-12-31
Filing date: 2003-12-31
Publication date: 2008-11-19
Anticipated expiration: 2023-12-31
Also published as: CN1635804A

Abstract

The present invention discloses a method for implementing invisible character transmission on a short message communication platform. In the method, firstly, six-bit codes and tables corresponding to visible characters are respectively defined at a communication transmitting terminal and a receiving terminal of short messages; data (eight-bit codes) to be transmitted is converted into a six-bit code; the six-bit codes and the tables corresponding to visible characters are searched, and corresponding visible characters are searched out; the visible characters are transmitted to a control center by a short message SMS; the control center searches out the corresponding six-bit code according to the received visible characters from the six-bit codes and the tables corresponding to visible characters; the six-bit code is converted into the original data of the eight-bit code by inverse operation. The problem of transmitting invisible characters is solved by the method; additionally, visible characters can also use the method, and in this way, codes transmitted in the transmission process are not original codes; simultaneously, the problem of poor transmission safety of plaintexts is solved.

Description

A kind of method that on the short message communication platform, realizes the invisible character of transmission

Technical field

The present invention relates to method, relate in particular to the transmission of invisible character by the note transmission character.

Background technology

Present note can only be advanced transmission to character visible, promptly only (0X00～0XFF) middle 0X20～interior character of 0X7F scope transmits to the ASCII character table, to general SMS, the content of its transmission all is a character visible, but when transmitting the information of some field such as GPS vehicle satellite fix with note, some invisible characters are just extremely important in information of vehicles, if only transmit the character visible part, then miss the information of very important invisible part, made the accuracy of information to ensure.

Summary of the invention

The object of the invention is to propose a kind of method that solves invisible character transmission.

Concrete implementation is:

A kind of on the short message communication platform, realize the invisible character of transmission method: the correspondence table that all defines six codings and character visible at the communication transmitting terminal and the receiving terminal of note at first; The data that will transmit (eight codings) change into six codings; Search six codings and find out corresponding character visible with the correspondence table of character visible; SMS is transferred to information centre with character visible by note; Information centre finds out six corresponding codings with the character visible of receiving by six codings and the correspondence table of character visible; Six codings are converted into the initial data of eight codings by inverse operation.

Described eight codings are adopted and are converted into six codings in the following method:

(1) adds two zero before per six of group octet coding binary sequence;

(2) one group of new number is separated into a new byte by per eight, not enough eight back is with eight on spot patch foot.

Described eight coded datas will transmitting are invisible character.

Described eight coded datas will transmitting also can be character visible.

Pass through said method, after invisible character is six codings through code conversion, the front two of each six coding all is zero, so the value of each six coding is all in the scope of these 64 values of 0X00～0X3F, converting them to visible symbol according to code conversion table (value in the table all is a character visible) sends by note SMS, just solved the transmission problem of invisible character, in addition, character visible also can adopt aforesaid way, what transmit in transmission course like this is not original coding, has solved the problem of plaintext transmission poor stability simultaneously.

Embodiment

At first one group of information of vehicles (binary data, eight codings) is carried out six code conversion:

A byte (A) of binary data is expression like this:

A7，A6，A5，A4，A3，A2，A1，A0

Eight coded representations of the ABCD... of one group of binary data are:

A7，A6，A5，A4，A3，A2，A1，A0、B7，B6，B5，B4，B3，B2，B1，B0、C7，C6，C5，C4，C3，C2，C1，C0、D7，D6，D5，D4，D3，D2，D1，D0...

Carry out six codings: promptly add two 0 in per six front and by new eight as a new byte, eight of last byte less thaies mend enough eight with 0, be:

0，0，A7，A6，A5，A4，A3，A2//0，0，A1，A0、B7，B6，B5，B4//0，0，B3，B2，B1，B0，C7，C6//0，0，C5，C4，C3，C2，C1，C0//0，0，D7，D6，D5，D4，D3，D2//D1，D0...

Through each the byte front two after the conversion all is 0, so the span of a byte is in the scope of value of these 64 values of 0X00～0X3F.

To change each byte of back (0,0, b5, b4, b3, b2, among the b1, back 6 b5～b0 b0) and predefined code conversion table (following table) character visible carry out corresponding, b5, b4, b3 respectively corresponding first be listed as in three positions of each group.Three positions of each group in corresponding respectively first row of b2, b1, b0.Corresponding character in the table can be the character visible that is provided with arbitrarily, then forms one group of character visible by mapping like this.

	000	001	010	011	100	101	110	111
	000	001	010	011	100	101	110	111	000	2E	2C	30	31	32	33	34	35
001	36	37	38	39	41	42	43	44	000	2E	2C	30	31	32	33	34	35
001	36	37	38	39	41	42	43	44	010	45	46	47	48	49	4A	4B	4C
011	4D	4E	4F	50	51	52	53	54	010	45	46	47	48	49	4A	4B	4C
011	4D	4E	4F	50	51	52	53	54	100	55	56	57	58	59	5A	61	62
101	63	64	65	66	67	68	69	6A	100	55	56	57	58	59	5A	61	62
101	63	64	65	66	67	68	69	6A	110	6B	6C	6D	6E	6F	70	71	72
111	73	74	75	76	77	78	79	7A	110	6B	6C	6D	6E	6F	70	71	72

Character visible is passed to control centre by note SMS, and control centre looks into the code conversion table with the data of receiving, converts six codings to, by eight inverse operations of changeing six codings, converts six codings to original binary data.

The invention will be further described below in conjunction with instantiation:

As the data that will transmit be:

29 7f, 10 70 01 11 31 33 34 80 ef e3 20 (16 system)

Being converted to binary system is:

00101001 01111111 00010000 0111000 000000001 00010001 00110001

(29) (7f) (10) (70) (01) (11) (31)

00110011 00110100 10000000 11101111 11100011 0010000

(33) (34) (80) (ef) (e3) (20)

Converting six to is encoded to:

00001010 00010111 00111100 00010000 00011100 00000000

(0a) (17) (3c) (20) (2c) (00)

00000100 00010001 00001100 00010011 00001100 00110100 00100000

(04) (11) (0c) (13) (0c) (34) (20)

00001110 00111111 00100011 00001000 00000000

(0e) (3f) (23) (08) (00)

Look into conversion table and can get data:

38 4c 77 45 51 2e 32 46 41 48 41 6f 55 43 7a 58 36 2e

In this data corresponding A SCII code table:

“8LwEQ.2FAHAoUCzX6”

Vehicle sends this note to control centre, and middle the heart channel of Hang-Shaoyin inverse operation obtains data (29 7f, 10 7,001 11 31 33 34 80 ef e3 20).So just realized the transmission problem of invisible character, what transmit in transmission course simultaneously is not original coding, has solved the problem of plaintext transmission poor stability yet.

Aforesaid eight codings are converted into six Methods for Coding also can adopt existing other coding methods, now exemplifies two for example down:

(1) 64 system method

The data transaction of 16 systems is become the data of 64 systems.

2 byte conversion of the data of 16 systems become 64 systems with 3 byte representations.

For example: 16 system character strings: it is as follows that 27 00 29 41 7f ea b6 convert 64 system methods to:

To take out two bytes in order: 27 00

Its binary representation: 0,010 0,111 0,000 0000

Its 64 system is expressed as: 02 28 00

Take out two bytes again: 29 41

Its binary representation: 0,010 1,001 0,100 0001

Its 64 system is expressed as: 02 35 01

Take out two bytes again: 7f ea

Its binary representation: 0,111 1,111 1,110 1010

Its 64 system is expressed as: 07 63 42

Take out two byte: b6 00 (only remain a byte this moment, so fill a byte 00) again

Its binary representation: 1,011 0,110 0,000 0000

Its 64 system is expressed as: 11 24 00

So the data after the conversion are as follows: 02 28 00 02 35 01 07 63 42 11 24 00

(2) method of multibyte shuffling

Can adopt 6 byte conversion to become the method for 8 bytes.As the data number is not 6 multiple, can mend 0, makes it to become 6 multiple.

If any following data: 45 23 3e fe 40 00

Binary representation is as follows: 0,100 0101

0010 0011

0011 1110

1111 1110

0100 0000

0000 0000

Fetch data and fill in front by each binary data same position and can obtain 8 bytes for two 0:

00 000100(04)

00 100110(26)

00 011100(1c)

00 001100(0c)

00 101100(2c)

00 011100(1c)

00 110000(30)

Claims

1, a kind of method that realizes the invisible character of transmission on the short message communication platform is characterized in that: the correspondence table that at first defines six codings and character visible; The invisible character data of eight codings that will transmit changes into six codings; Search six codings and find out corresponding character visible with the correspondence table of character visible; By note character visible is transferred to control centre; Control centre finds out six corresponding codings with the character visible of receiving by six codings and the correspondence table of character visible; Six codings are converted into the invisible character data of eight codings by inverse operation.

2, a kind of method that on the short message communication platform, realizes the invisible character of transmission as claimed in claim 1, it is characterized in that: described eight codings are adopted and are converted into six codings in the following method:

Add two zero before per six of (1) one group octet coding binary sequence;

(2) one group of new number is separated into a new byte by per eight, not enough for eight eight on spot patch foot.