Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Time-sharing gap encrypting-diencrypting technology suitable for group path channels

An encryption, decryption, and time slot technology, which is applied in the field of signal transmission, can solve problems such as many idle time slots, large waste of transmission resources, and inability to protect group signals, achieving the effect of channel encryption and saving transmission resources

Inactive Publication Date: 2008-11-26
NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this encryption and decryption method has restrictions on the need to separately encrypt and decrypt certain signals, or require different signals to be protected by different algorithms, and in network applications with asymmetrical points, the traditional multiplexer is The channel machine cannot be connected in a multi-level system, the waste of transmission resources is large, and there are many idle time slots for transmission. It cannot protect the group signal with multiple algorithms, so that it is impossible to implement algorithms with different encryption levels for different data with different importance. Encryption and decryption protection

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Time-sharing gap encrypting-diencrypting technology suitable for group path channels
  • Time-sharing gap encrypting-diencrypting technology suitable for group path channels
  • Time-sharing gap encrypting-diencrypting technology suitable for group path channels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The time-slot encryption circuit or decryption circuit of the present invention includes a frame positioning circuit module for locating the signal before encryption and for locating the signal before decryption, and converts the signal to be encrypted or decrypted to generate a time slot control signal The time slot control circuit module, the algorithm selection circuit module for algorithm selection for signals that need to be encrypted or decrypted, and the frame error reporting and password synchronization circuit module for ensuring the synchronous operation of corresponding algorithms at both ends of the line.

[0021] The logic flow of the time-slot encryption circuit or decryption circuit of the present invention is: at the sending end, the security machine performs frame positioning on the clear code sent by the multiplexer through the frame positioning module to obtain a frame positioning signal, and according to this frame positioning signal, the The time slo...

Embodiment 2

[0023] Taking the primary group of PCM30 / 32 as an example, ITUG704 proposes to define its time slot as:

[0024] Frame length: 125s

[0025] Number of time slots per frame: 32

[0026] Road time slot width: 3.9s

[0027] Number of bits per slot: 8

[0028] Frames per multiframe: 16

[0029] Compression and expansion type A-law (1TUG.711 recommendation)

[0030] Total bit rate: 2.048Mb / s

[0031] Line code type: AMI or HD3 code

[0032] Sampling frequency: 8kHz

[0033] The G703PACK interface converter of CTC Company is used to convert the group signal in G704 frame format into the above frame format suggested by ITUG.704, so that the occupation of various low-speed signals in the group signal is reflected in the occupation of time slots . Such as Figure 5 Among them, assuming that the image is 512kb / s, it will occupy 8 time slots in PCM30 / 32. Therefore, when the user requests to protect only the image, only the time slot occupied by the encryption and decryption ima...

Embodiment 3

[0035] According to the frame out-of-synchronization and frame synchronization stipulated in the ITUG732 proposal, there are optional frame alignment circuits in the prior art.

[0036] At the same time, according to the frame alignment signal determined by the frame alignment circuit and the relative position of the encrypted time slot, the corresponding encrypted time slot control waveform diagram can be obtained, thereby obtaining the encrypted time slot control circuit, such as figure 2 In , the circuit diagram of encrypting time slot A with Algorithm B. Calculator 1 is used to calculate the number of clocks between the frame alignment signal and the first bit of time slot A that needs to be encrypted, and calculator 2 is used to calculate the number of clocks between the frame alignment signal and the last bit of time slot A that needs to be encrypted, through the register D can get an algorithm selection signal, so as to realize accurate control of the encryption time s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses technique suitable to group channel transmission for crypting or decrypting signal division time slot in single signal or in asymmetric network. Based on definition of time slot proposed in TTU G704, group signal through relevant process is converted to the frame format proposed in TTU G704. Thus, occupancy in a group signal by each signal in low speed is realized by occupying time slot so that process of crypting or decrypting time slot realizes purpose of the invention. The invention saves transmission resources, protects group signal by using multiple algorithms. Algorithms in different security levels can be used to crypt or decrypt data in different importances.

Description

Technical field: [0001] The invention relates to the technical field of signal transmission, in particular to a technology suitable for encrypting or decrypting a single signal or signal time slots in an asymmetrical network in group channel transmission. Background technique: [0002] Several low-speed digitized voice, image, data or other signals can be combined into a high-speed data bit stream through a multiplexer, which is called a group signal. At present, symmetrical channel encryption and decryption devices are usually used for the encryption and decryption protection of the physical layer of the group signal, that is, at the sending end, a channel encryption device is required to encrypt and protect the group signal before sending it into the channel; at the receiving end, a channel encryption device is also required. The same channel decryption device decrypts and restores the received group signal. During the entire working process, the encryption device or decr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04K1/00
Inventor 董仲林王瑛李毅李庭胜邱敏
Owner NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com