CN110035069A - A kind of Internet of Things information safety protecting method - Google Patents
A kind of Internet of Things information safety protecting method Download PDFInfo
- Publication number
- CN110035069A CN110035069A CN201910197334.5A CN201910197334A CN110035069A CN 110035069 A CN110035069 A CN 110035069A CN 201910197334 A CN201910197334 A CN 201910197334A CN 110035069 A CN110035069 A CN 110035069A
- Authority
- CN
- China
- Prior art keywords
- data
- encryption
- segmentation
- segment
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
- H04L63/0478—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload applying multiple layers of encryption, e.g. nested tunnels or encrypting the content with a first key and then with at least a second key
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/12—Applying verification of the received information
Abstract
The present invention discloses a kind of Internet of Things information safety protecting method; include the following steps: that data sending terminal generates data and reads incoming end model, identification sequence number, encryption table and current time end to end; correspond to current time and encryption table end to end; and generate just encryption data; first encryption data is encrypted again by SCB2 algorithm, to obtain re-encrypting data.The Internet of Things information safety protecting method; by the utilization for encrypting table, current time and SCB2 algorithm end to end; further increase the safety of data; strengthen protection effect; it is sent after being segmented data by the way of segmentation; and every segment data is examined respectively and reporting an error respectively; without integrally being transmitted data again when to which error in data occurs; it improves work efficiency, records after the exploratory detection data issued by third party and malicious data is analyzed well in time with this.
Description
Technical field
The present invention relates to internet of things field, specially a kind of Internet of Things information safety protecting method.
Background technique
Internet of Things is the important component of generation information technology and the important development stage of information age, is cared for
Name Si Yi, Internet of Things are exactly the connected internet of object object, and application innovation is the core of Internet of Things development, in the application of Internet of Things,
It needs to carry out protection operation to the transmission of data using Internet of Things information safety protecting method.
Traditional Internet of Things information safety protecting method, Encryption Algorithm is too simple, and protecting effect is bad, if while data
It then needs to carry out entirety to data in the presence of mistake to transmit again, working efficiency is low, and is difficult to well carry out malicious data
Record and analysis, use while reducing working efficiency to user are made troubles.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of Internet of Things information safety protecting method, Internet of Things are solved
Net information safety protecting method Encryption Algorithm is too simple, and protecting effect is bad, while mistake then needs logarithm to data if it exists
It is transmitted again according to entirety is carried out, working efficiency is low, and is difficult to the problem of malicious data is recorded and analyzed well.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs: a kind of Internet of Things information safety protection
Method, which comprises the steps of:
S1, data generate: data sending terminal generates data and reads incoming end model, identification sequence number, encryption table end to end
And current time；
S2, data just encrypt: corresponding to current time and encryption table end to end, and generate just encryption data；
S3, data re-encrypt: first encryption data being encrypted again by SCB2 algorithm, to obtain re-encrypting number
According to；
S4, data sectional: re-encrypting data is divided into three preceding segmentation, middle segmentation and rear segmentation segmentations；
S5, segmental machining prepare: reading segmentation table end to end, and randomly choose and be segmented a certain cell in table end to end, read
Its corresponding final value, fragment header numerical value and segmentation mantissa value；
S6, segmental machining: preceding segment data, middle segment data and rear segment data are generated respectively；
S7, data transmission: preceding segment data, middle segment data and rear segment data are successively sent to receiving end；
S8, segmentation are examined: successively by the fragment header data of preceding segment data, middle segment data and rear segment data, segmentation
Mantissa's evidence and final value take out simultaneously corresponding segments, and table checks whether correctly, step S9 to be carried out if correct, if incorrect send out end to end
Transmit signal again out, data sending terminal receives transmit signal again after corresponding segmentation retransmitted according to corresponding segment serial number
Data, data receiver re-start step S8 after receiving new corresponding segments data；
S9, algorithm decryption: after data obtained in step S8 are taken out corresponding segments, three segment datas are integrated and is led to
Crossing the decryption of SCB2 algorithm becomes first encryption data；
S10, removal encryption head, encryption tail: by first encryption data, according to current time therein and encryption, table is tested end to end
Whether card encryption head, encryption tail are correct, if correct take out transmission data, and control corresponding mechanism according to transmission data and are corresponded to
Operation, if encryption head, encryption tail it is incorrect if be not responding to, and record be not responding to data and its receiving time.
Preferably, in S1, sheet format is as follows end to end for the encryption: row: the hour numerical value of current time；Column: when current
Between minute numerical value；Cell: the numerical value of head and the numerical value of encryption tail are encrypted.
Preferably, in S2, the just encryption data format are as follows: encryption head+transmission data+encryption tail；Encrypt head format
Are as follows: incoming end model+identification number+encryption head numerical value+current time；Encrypt tail format are as follows: incoming end model+identification number+
Encrypt mantissa value+current time.
Preferably, in S4, the length of the re-encrypting data is fixed value, therefore the length of three segmentations is to fix
Value.
Preferably, in S5, table is as follows end to end for the segmentation: row: fragment header numerical value；Column: segmentation mantissa value；Unit
Lattice: final value.
Preferably, in S6, the preceding segment data format are as follows: fragment header numerical value+preceding segmentation+segmentation mantissa value+final value+right
Answer a section serial number；Middle segment data format are as follows: fragment header numerical value+middle segmentation+segmentation mantissa value+final value+corresponding segment serial number；After be segmented
Data format are as follows: fragment header numerical value+rear segmentation+segmentation mantissa value+final value+corresponding segment serial number；Wherein corresponding segment serial number is used for
Distinguish preceding segment data, the specific numbers of middle segment data and rear segment data.
Preferably, described to transmit signal format again in S8 are as follows: corresponding segment serial number+error code.
(3) beneficial effect
The present invention provides a kind of Internet of Things information safety protecting methods.Have it is following the utility model has the advantages that
The Internet of Things information safety protecting method, by encrypting the utilization of table, current time and SCB2 algorithm end to end, into
One step increases the safety of data, strengthens protection effect, sends after being segmented data by the way of segmentation, and right
Every segment data is examined respectively and reporting an error respectively, thus without integrally being transmitted data again when error in data occurs,
It improves work efficiency, is recorded in time with this after the exploratory detection data issued by third party well to malicious data
Being analyzed (since recorded data is examined by segmentation, can be very good to distinguish other signals and malice is believed
Number).
Specific embodiment
Described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
A kind of Internet of Things information safety protecting method, which comprises the steps of:
S1, data generate: data sending terminal generates data and reads incoming end model, identification sequence number, encryption table end to end
(table is as follows end to end for encryption: row: the hour numerical value of current time with current time；Column: the minute numerical value of current time；Unit
Lattice: the numerical value of head and the numerical value of encryption tail are encrypted), wherein incoming end model, the length of identification sequence number are three bytes (two
14) binary system ordered series of numbers, the hour numerical value of current time and the minute numerical value of current time are five bytes (40
Position) binary system ordered series of numbers；
S2, data just encrypt: corresponding to current time and encryption table end to end, and generate just encryption data (first encryption data lattice
Formula are as follows: encryption head+transmission data+encryption tail；Encrypt head format are as follows: incoming end model+identification number+encryption head numerical value+current
Time；Encrypt tail format are as follows: incoming end model+identification number+encryption mantissa value+current time), wherein encryption head and encryption tail
It is the binary system ordered series of numbers of five bytes (40)；
S3, data re-encrypt: first encryption data being encrypted again by SCB2 algorithm, to obtain re-encrypting number
According to；
S4, data sectional: re-encrypting data is divided into preceding segmentation, three segmentations of middle segmentation and rear segmentation (re-encrypt number
According to length be fixed value, therefore three segmentation length be fixed value)；
S5, segmental machining prepare: reading segmentation table end to end, and randomly choose and be segmented a certain cell in table end to end, read
(table is as follows end to end for segmentation: row: fragment header numerical value for its corresponding final value, fragment header numerical value and segmentation mantissa value；Column: segmentation tail
Numerical value；Cell: final value), wherein final value is the binary system ordered series of numbers of three bytes (24)；
S6, segmental machining: preceding segment data, middle segment data and rear segment data (preceding segment data format are generated respectively
Are as follows: fragment header numerical value+preceding segmentation+segmentation mantissa value+final value+corresponding segment serial number；Middle segment data format are as follows: fragment header numerical value+
Middle segmentation+segmentation mantissa value+final value+corresponding segment serial number；Segment data format afterwards are as follows: fragment header numerical value+rear segmentation+segmentation mantissa
Value+final value+corresponding segment serial number；Wherein corresponding segment serial number is for distinguishing preceding segment data, middle segment data and rear segment data
Specific numbers), wherein fragment header numerical value, segmentation mantissa value and corresponding segment serial number be four bytes (32) two into
Ordered series of numbers processed；
S7, data transmission: preceding segment data, middle segment data and rear segment data are successively sent to receiving end；
S8, segmentation are examined: successively by the fragment header data of preceding segment data, middle segment data and rear segment data, segmentation
Mantissa's evidence and final value take out simultaneously corresponding segments, and table checks whether correctly, step S9 to be carried out if correct, if incorrect send out end to end
Transmit signal again out, data sending terminal receives transmit signal again after corresponding segmentation retransmitted according to corresponding segment serial number
Data, data receiver, which receives, to be re-started step S8 after new corresponding segments data and (transmits signal format again are as follows: corresponding segment
Serial number+error code), wherein error code is the binary system ordered series of numbers of fixed three bytes (24)；
S9, algorithm decryption: after data obtained in step S8 are taken out corresponding segments, three segment datas are integrated and is led to
Crossing the decryption of SCB2 algorithm becomes first encryption data；
S10, removal encryption head, encryption tail: by first encryption data, according to current time therein and encryption, table is tested end to end
Whether card encryption head, encryption tail are correct, if correct take out transmission data, and control corresponding mechanism according to transmission data and are corresponded to
Operation, if encryption head, encryption tail it is incorrect if be not responding to, and record be not responding to data and its receiving time.
In conclusion the Internet of Things information safety protecting method, by encrypting table, current time and SCB2 algorithm end to end
Utilization, further increase the safety of data, strengthen protection effect, after being segmented data by the way of segmentation
It sends, and every segment data is examined respectively and reporting an error respectively, to be not necessarily to integrally carry out data when error in data occurs
Again it transmits, improves work efficiency, recorded in time after the exploratory detection data issued by third party with this well
Malicious data is analyzed (since recorded data is examined by segmentation, can be very good to distinguish other signals with
And malicious signal).
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of Internet of Things information safety protecting method, which comprises the steps of:
S1, data generate: data sending terminal generates data and reads incoming end model, identification sequence number, encrypts table end to end and work as
The preceding time；
S2, data just encrypt: corresponding to current time and encryption table end to end, and generate just encryption data；
S3, data re-encrypt: first encryption data being encrypted again by SCB2 algorithm, to obtain re-encrypting data；
S4, data sectional: re-encrypting data is divided into three preceding segmentation, middle segmentation and rear segmentation segmentations；
S5, segmental machining prepare: reading segmentation table end to end, and randomly choose and be segmented a certain cell in table end to end, it is right to read its
Final value, fragment header numerical value and the segmentation mantissa value answered；
S6, segmental machining: preceding segment data, middle segment data and rear segment data are generated respectively；
S7, data transmission: preceding segment data, middle segment data and rear segment data are successively sent to receiving end；
S8, segmentation are examined: successively by the fragment header data of preceding segment data, middle segment data and rear segment data, segmentation mantissa
According to simultaneously corresponding segments are taken out with final value, table checks whether correctly, to carry out step S9 if correct end to end, if incorrect issue weight
New transmission signal, data sending terminal receives transmit signal again after corresponding segments retransmitted according to corresponding segment serial number
According to data receiver re-starts step S8 after receiving new corresponding segments data；
S9, algorithm decryption: after data obtained in step S8 are taken out corresponding segments, by three whole merga pass of segment data
The decryption of SCB2 algorithm becomes first encryption data；
S10, remove encryption head, encryption tail: by first encryption data, according to current time therein and encryption, table verifying adds end to end
Whether close head, encryption tail are correct, if correct take out transmission data, and control corresponding mechanism according to transmission data and carry out corresponding behaviour
Make, is not responding to if encryption head, encryption tail are incorrect, and record and be not responding to data and its receiving time.
2. a kind of Internet of Things information safety protecting method according to claim 1, it is characterised in that: described to add in S1
Close sheet format end to end is as follows: row: the hour numerical value of current time；Column: the minute numerical value of current time；Cell: head is encrypted
The numerical value of numerical value and encryption tail.
3. a kind of Internet of Things information safety protecting method according to claim 1, it is characterised in that: described first in S2
Encryption data format are as follows: encryption head+transmission data+encryption tail；Encrypt head format are as follows: incoming end model+identification number+encryption head
Numerical value+current time；Encrypt tail format are as follows: incoming end model+identification number+encryption mantissa value+current time.
4. a kind of Internet of Things information safety protecting method according to claim 1, it is characterised in that: in S4, it is described again
The length of encryption data is fixed value, therefore the length of three segmentations is fixed value.
5. a kind of Internet of Things information safety protecting method according to claim 1, it is characterised in that: in S5, described point
Paragraph header tail table is as follows: row: fragment header numerical value；Column: segmentation mantissa value；Cell: final value.
6. a kind of Internet of Things information safety protecting method according to claim 1, it is characterised in that: in S6, before described
Segment data format are as follows: fragment header numerical value+preceding segmentation+segmentation mantissa value+final value+corresponding segment serial number；Middle segment data format are as follows:
Fragment header numerical value+middle segmentation+segmentation mantissa value+final value+corresponding segment serial number；Segment data format afterwards are as follows: fragment header numerical value+rear point
Section+segmentation mantissa value+final value+corresponding segment serial number；Wherein corresponding segment serial number for distinguish preceding segment data, middle segment data and
The specific numbers of segment data afterwards.
7. a kind of Internet of Things information safety protecting method according to claim 1, it is characterised in that: described heavy in S8
New transmission signal format are as follows: corresponding segment serial number+error code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910197334.5A CN110035069B (en) | 2019-03-15 | 2019-03-15 | Internet of things information security protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910197334.5A CN110035069B (en) | 2019-03-15 | 2019-03-15 | Internet of things information security protection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110035069A true CN110035069A (en) | 2019-07-19 |
| CN110035069B CN110035069B (en) | 2021-08-27 |
Family
ID=67236047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910197334.5A Expired - Fee Related CN110035069B (en) | 2019-03-15 | 2019-03-15 | Internet of things information security protection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110035069B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110650150A (en) * | 2019-10-10 | 2020-01-03 | 上海久誉软件系统有限公司 | Computer wireless propagation neural network method based on 5G network |
| CN111614440A (en) * | 2020-05-22 | 2020-09-01 | 陈杰 | Data sending system and method adopting sectional type data structure |
| CN112888003A (en) * | 2021-02-01 | 2021-06-01 | 安徽马钢张庄矿业有限责任公司 | Mine equipment communication signal processing method based on 5G industrial internet |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0676876A1 (en) * | 1994-04-05 | 1995-10-11 | International Business Machines Corporation | Encryption method and system |
| CN101345866A (en) * | 2008-08-15 | 2009-01-14 | 四川长虹电器股份有限公司 | Encryption and decryption method for static audio/video document |
| CN102752102A (en) * | 2012-07-02 | 2012-10-24 | 珠海全志科技股份有限公司 | Data package segmented encryption and transmission processing method and device |
| US20120331293A1 (en) * | 2011-06-23 | 2012-12-27 | Azuki Systems, Inc. | Method and system for secure over-the-top live video delivery |
| CN105763315A (en) * | 2014-12-16 | 2016-07-13 | 展讯通信（深圳）有限公司 | Data encryption and decryption method and apparatus thereof, and communication system |
| CN106067878A (en) * | 2016-05-31 | 2016-11-02 | 国网山东省电力公司寿光市供电公司 | A kind of network data encryption transmission method |
| CN106452728A (en) * | 2016-08-30 | 2017-02-22 | 上海卓易科技股份有限公司 | Data encryption method |
| CN107135062A (en) * | 2017-05-08 | 2017-09-05 | 桂林电子科技大学 | A kind of encryption method of improved big file |
-
2019
- 2019-03-15 CN CN201910197334.5A patent/CN110035069B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0676876A1 (en) * | 1994-04-05 | 1995-10-11 | International Business Machines Corporation | Encryption method and system |
| CN101345866A (en) * | 2008-08-15 | 2009-01-14 | 四川长虹电器股份有限公司 | Encryption and decryption method for static audio/video document |
| US20120331293A1 (en) * | 2011-06-23 | 2012-12-27 | Azuki Systems, Inc. | Method and system for secure over-the-top live video delivery |
| CN102752102A (en) * | 2012-07-02 | 2012-10-24 | 珠海全志科技股份有限公司 | Data package segmented encryption and transmission processing method and device |
| CN105763315A (en) * | 2014-12-16 | 2016-07-13 | 展讯通信（深圳）有限公司 | Data encryption and decryption method and apparatus thereof, and communication system |
| CN106067878A (en) * | 2016-05-31 | 2016-11-02 | 国网山东省电力公司寿光市供电公司 | A kind of network data encryption transmission method |
| CN106452728A (en) * | 2016-08-30 | 2017-02-22 | 上海卓易科技股份有限公司 | Data encryption method |
| CN107135062A (en) * | 2017-05-08 | 2017-09-05 | 桂林电子科技大学 | A kind of encryption method of improved big file |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110650150A (en) * | 2019-10-10 | 2020-01-03 | 上海久誉软件系统有限公司 | Computer wireless propagation neural network method based on 5G network |
| CN111614440A (en) * | 2020-05-22 | 2020-09-01 | 陈杰 | Data sending system and method adopting sectional type data structure |
| CN111614440B (en) * | 2020-05-22 | 2021-04-20 | 西安博达软件股份有限公司 | Data sending system and method adopting sectional type data structure |
| CN112910606A (en) * | 2020-05-22 | 2021-06-04 | 陈杰 | Data sending system adopting sectional type data structure |
| CN112910606B (en) * | 2020-05-22 | 2022-08-02 | 湖北省成套招标股份有限公司 | Data sending system adopting sectional type data structure |
| CN112888003A (en) * | 2021-02-01 | 2021-06-01 | 安徽马钢张庄矿业有限责任公司 | Mine equipment communication signal processing method based on 5G industrial internet |
| CN112888003B (en) * | 2021-02-01 | 2023-06-06 | 安徽马钢张庄矿业有限责任公司 | Mine equipment communication signal processing method based on 5G industrial Internet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110035069B (en) | 2021-08-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110035069A (en) | A kind of Internet of Things information safety protecting method | |
| CN106961430B (en) | Physical isolation transmission method and physical isolation transmission device based on two-dimensional code | |
| CN108200020B (en) | Industrial big data safe transmission device and method | |
| CN114285562B (en) | Data encryption method and device | |
| CN104753538B (en) | Manchester encoded signals coding/decoding method and device | |
| CN114253484B (en) | Big data cloud storage server | |
| CN108964870A (en) | The safe Enhancement Method of railway transponder message based on motor synchronizing chaos cipher | |
| CN117640256B (en) | Data encryption method, recommendation device and storage medium of wireless network card | |
| CN115134138A (en) | File synchronization method based on one-way optical gate | |
| CN114338217A (en) | Data encryption transmission method | |
| CN112235101B (en) | Coding method and device based on hybrid coding mechanism, decoding method and device | |
| CN108881124B (en) | Method, system, storage medium and device for realizing high-performance communication between modules | |
| CN109784104A (en) | SATA hard disc crypto module and its working method, system and its working method | |
| CN206506558U (en) | A kind of physical isolation transmitting device based on Quick Response Code | |
| CN116566677B (en) | Short message receiving and transmitting system of serial server | |
| US20230308259A1 (en) | Data transmission method, communication apparatus, and communication system | |
| CN115208557A (en) | Data encryption method and device, electronic equipment and computer storage medium | |
| CN110278068B (en) | LoRa communication encryption system based on chaos sequence | |
| CN113225299A (en) | Multi-path distributed power data transmission method and system based on two-dimensional code | |
| CN110517045B (en) | Block chain data processing method, device, equipment and storage medium | |
| CN111897991B (en) | Image annotation method and device | |
| CN107395331A (en) | A kind of power equipment communication data abnormal alarm system | |
| CN108334469A (en) | A kind of mthods, systems and devices of high-speed differential serial data transmission | |
| CN112632583A (en) | Internet of things integrated management system | |
| CN102854543B (en) | Standing body error positioning method and device for field seismic instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhan Yue Inventor after: Yang Huan Inventor after: Zhang Yulei Inventor after: Liu Pengfei Inventor before: Yang Huan Inventor before: Zhang Yulei Inventor before: Liu Pengfei |
|
| CB03 | Change of inventor or designer information | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210806 Address after: 572011 Yuya road Greenland Yuelan Bay phase III Central Park 8b701, Jiyang District, Sanya City, Hainan Province Applicant after: Sanya tal investment partnership (L.P.) Address before: 450000 building 3, No.57, science Avenue, development zone, high tech Industrial Park, Zhongyuan District, Zhengzhou City, Henan Province 2007 Applicant before: HENAN GT IOT Co.,Ltd. |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210827 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |