CN109101116B - iOS terminal equipment safety keyboard and implementation method thereof - Google Patents
iOS terminal equipment safety keyboard and implementation method thereof Download PDFInfo
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- CN109101116B CN109101116B CN201810817695.0A CN201810817695A CN109101116B CN 109101116 B CN109101116 B CN 109101116B CN 201810817695 A CN201810817695 A CN 201810817695A CN 109101116 B CN109101116 B CN 109101116B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
- G06F3/0219—Special purpose keyboards
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/602—Providing cryptographic facilities or services
Abstract
The invention discloses an iOS terminal equipment safety keyboard, and relates to the technical field of iOS safety keyboards. The invention comprises a drawing layer, an encryption logic layer, an anti-screen-capture logic layer and an interface layer. The invention also provides a method for realizing the security keyboard of the iOS terminal equipment. According to the method, the aes128 and the MD5 are combined for encryption, the MD5 encryption algorithm is adopted for encrypting the character string spliced by the safe keyboard address and the fixed character string to obtain the key, and the safe keyboard addresses are different when the safe keyboard is popped up again each time, so that the safety of the content input by a user is ensured; the drawing layer sequentially assigns the random sequence of the key values of the keyboard to each key class object in the keyboard to generate a random keyboard; when the safety keyboard is popped up each time, the arrangement sequence of the keys in the safety keyboard is different, information leakage caused by the fact that a user obtains input content by monitoring key positions and estimates the input content by observing key input positions is avoided, and the safety of content input of the safety keyboard is improved.
Description
Technical Field
The invention belongs to the technical field of iOS (Internet operating System) safety keyboards, and particularly relates to an iOS terminal equipment safety keyboard and an implementation method thereof.
Background
With the rapid development of mobile internet technology, more and more mobile applications are emerging in our lives. In the applications, personal sensitive information of people needs to be input more and more, and in the input process, the protection of the personal information of people, such as bank card information, password account information, identity card information and the like, is more and more important.
The input keyboard used by the iOS device application is basically the default simplified chinese input keyboard of the system. When the account password or other important information of the user is input, if important information such as a simplified Chinese input method keyboard of the system, passwords of English characters and numerical characters and the like is used, the automatic correction prompt of the input method of the system is automatically started, and then the input record of the user is cached.
The cached information for these system keyboards can be retrieved through automatically corrected string entry records of the system input method. By exporting the character string cache file, the user can see that the input records are stored in plain text, because the user system cannot process the input records of all users as sensitive information such as passwords, generally, the input cache file of a conventional iPhone user, and the character strings which appear at high frequency are user names and passwords.
Therefore, when sensitive information such as a user account password is input, the system keyboard is avoided, and a more secure keyboard customized by the user is used. The method mainly can prevent a third party from reading the keyboard cache of the system, and information leakage caused by screen capture of a user or screen capture and screen recording of third-party software is avoided.
The invention aims to research and develop a security keyboard of iOS terminal equipment and an implementation method thereof, and aims to solve the security problems that user information can be obtained through screen capture and playback in a system keyboard of the iOS equipment and a cache file because keys of the keyboard are fixed.
Disclosure of Invention
The invention aims to provide an iOS terminal equipment safety keyboard and an implementation method thereof, wherein when a random keyboard is drawn through a drawing layer and the content is input by the safety keyboard, an aes128 encryption algorithm that the address of the current safety keyboard is used as a part of a key is adopted, so that the safety storage of the content of the safety keyboard is realized; the input content is replaced by adding "·" to the text attribute of the UITexField, so that the input content is effectively prevented from being displayed; meanwhile, the anti-screen-capture logic layer self-defined notification is used for monitoring the screen capture of the user and timely clearing the input content and the encrypted data in the corresponding memory, so that information leakage caused by screen capture is avoided; the safety problem that user information can be obtained through screen capture and display back in the existing iOS equipment system keyboard and the keyboard keys are fixed and the user information can be obtained through the cache file is solved.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to an iOS terminal equipment safety keyboard, comprising: the system comprises a drawing layer, an encryption logic layer, an anti-screenshot logic layer and an interface layer; wherein:
the safety keyboard drawn by the drawing layer comprises a numeric keyboard, an alphabetic keyboard and a symbol keyboard; the drawing layer generates a keyboard key value random sequence by disordering the keyboard key value sequence through a shuffling algorithm; the drawing layer sequentially assigns the random sequence of the key values of the keyboard to each key class object in the keyboard to generate a random keyboard;
the encryption layer adopts aes128 and MD5 to encrypt in a combined mode; the encryption layer encrypts the key and the encrypted object by adopting an aes128 encryption algorithm to obtain a ciphertext and stores the ciphertext in the memory; the encryption layer encrypts a character string obtained by splicing the address of the security keyboard and the fixed character string by adopting the MD5 encryption algorithm to obtain a key;
the encryption logic layer monitors key triggering on the security keyboard through a gesture UITapGestureRecognizer to acquire key values; the obtained key values are encrypted through an encryption layer and then stored in a memory; the encrypt logic layer adds an "·" to the text attribute of UITextField;
the anti-screen-capture logic layer self-defined notification is used for monitoring user screen capture; the notification is bound to an event; the event comprises clearing input content and encrypted data in a corresponding memory, and generating a new random sequence of keyboard key values;
the interface layer self-defines an iOS input text box MMDEncyptTextField and binds a security keyboard; and the interface layer is additionally provided with an interface for acquiring the encrypted actual input content.
Preferably, the drawing layer defines key classes and implements key class objects of the same number as the number of keys in the keyboard; the drawing layer acquires the position of the key class object and adds the key class object to the corresponding position of the view of the display container to generate a safety keyboard; the keyboard key value sequence comprises a numeric keyboard key value sequence, an alphabetic keyboard key value sequence and a symbol keyboard key value sequence which sequentially correspond to a numeric keyboard, an alphabetic keyboard and a symbol keyboard.
Preferably, the shuffling algorithm for scrambling the keyboard key value sequence to generate the keyboard key value random sequence specifically includes the following steps:
the shuffling algorithm is an arc4random algorithm; generating N different random numbers within the range of 0-N-1 by adopting the arc4 random; keys in the safety keyboard sequentially correspond to the N random numbers; and traversing the keys in the safety keyboard, and assigning the key value of the random number position corresponding to the current key value.
Preferably, the encryption layer decrypts the ciphertext in the memory by using a key and aes128 encryption algorithm; the key is obtained by encrypting the character string spliced by the secure keyboard address and the fixed character string through an MD5 encryption algorithm.
The implementation method of the iOS terminal equipment safety keyboard comprises the following steps:
a000: the drawing layer draws the safety keyboard; drawing a safe keyboard layout by utilizing an API (application programming interface) provided by the iOS system and realizing the basic function of the safe keyboard; binding an interface of a security keyboard by changing inputView of a system input box;
a001: generating a random keyboard by the drawing layer; utilizing shuffling algorithm to disorder keyboard key value sequence and producing keyboard key value random sequence; sequentially assigning the random sequence of key values of the keyboard to each key class object in the keyboard to generate a random keyboard;
a002: encrypting the logic layer input content; monitoring key triggering on the security keyboard through a gesture UITapGestureRecognizer to acquire key values; the obtained key values are encrypted through an encryption layer and then stored in a memory; the encrypt logic layer adds an "·" to the text attribute of UITextField;
a003: the encryption layer encrypts the input content; the encryption layer encrypts the key and the encrypted object by adopting an aes128 encryption algorithm to obtain a ciphertext and stores the ciphertext in the memory;
a004: the anti-screen-capture logic layer realizes anti-screen capture; the user-defined notification is used for monitoring user screen capture and binding with an event;
a005: the interface layer provides interface calling to the outside; self-defining iOS input text box MMDEncyptTextField and binding a security keyboard; adding an interface for acquiring the encrypted actual input content, and canceling the functions of pasting and cutting the input text box according to the length; if the plaintext approach is used: firstly, importing a header file import 'MMDKeyboardmanager.h' and binding textfield; when the ciphertext mode is used: the header file import "MMDEncyptTextField.h" is imported first, and the user-defined MMDEncyptTextField is directly used.
Preferably, said security keyboard basic functions include the display, switching and switching off of numeric, alphabetic and symbolic keyboards.
The invention has the following beneficial effects:
1. the drawing layer sequentially assigns the random sequence of the key values of the keyboard to each key class object in the keyboard to generate a random keyboard; when the safety keyboard is popped up each time, the key arrangement sequences in the safety keyboard are different, so that information leakage caused by the fact that a user acquires input content by monitoring key positions and estimates the input content by observing key input positions is avoided, and the safety of content input of the safety keyboard is improved;
2. according to the invention, the text attribute of UITextField is added with "·" to replace input content, so that the input content is effectively prevented from being displayed back, input information is prevented from being stolen by acquiring the display back when a safety keyboard is used for inputting, and the input safety of a user is improved;
3. the invention monitors the user screen capture and timely clears the input content and the encrypted data in the corresponding memory through the self-defined notice of the anti-screen capture logic layer, thereby avoiding information leakage caused by screen capture and indirectly ensuring the safety when the safety keyboard is used;
4. according to the invention, the aes128 and the MD5 are combined for encryption, the MD5 encryption algorithm is adopted for encrypting the character string spliced by the safe keyboard address and the fixed character string to obtain the key, and the safe keyboard addresses are different when the safe keyboard is popped up again, so that the safety of the content input by the user is ensured.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for implementing a secure keyboard of an iOS terminal device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to an iOS terminal equipment safety keyboard, comprising: the system comprises a drawing layer, an encryption logic layer, an anti-screenshot logic layer and an interface layer; wherein:
the safety keyboard drawn by the drawing layer comprises a numeric keyboard, an alphabetic keyboard and a symbol keyboard; the drawing layer generates a keyboard key value random sequence by disordering the keyboard key value sequence through a shuffling algorithm; the drawing layer sequentially assigns the random sequence of the key values of the keyboard to each key class object in the keyboard to generate a random keyboard;
the encryption layer adopts aes128 and MD5 to encrypt in a combined mode; the encryption layer encrypts the key and the encrypted object by adopting an aes128 encryption algorithm to obtain a ciphertext and stores the ciphertext in the memory; the encryption layer encrypts the character string spliced by the security keyboard address and the fixed character string by adopting an MD5 encryption algorithm to obtain a key;
the encryption logic layer monitors the key triggering on the security keyboard through a gesture UITapGestureRecognizer to acquire a key value of the key; the obtained key values are encrypted through an encryption layer and then stored in a memory; the encryption logic layer adds an "·" to the text attribute of UITextField;
the anti-screen-capture logic layer self-defined notification is used for monitoring user screen capture; the notification is bound to the event; the event comprises clearing the input content and the encrypted data in the corresponding memory, and generating a new random sequence of key values of the keyboard;
the interface layer self-defines an iOS input text box MMDEncyptTextField and binds a security keyboard; and the interface layer is additionally provided with an interface for acquiring the encrypted actual input content.
The drawing layer defines key classes and realizes key class objects with the same number as the number of keys in the keyboard; the drawing layer acquires the position of the key class object and adds the key class object to the corresponding position of the view of the display container to generate a safety keyboard; the keyboard key value sequence comprises a numeric keyboard key value sequence, an alphabetic keyboard key value sequence and a symbol keyboard key value sequence which sequentially correspond to the numeric keyboard, the alphabetic keyboard and the symbol keyboard.
The shuffling algorithm is used for disorganizing the keyboard key value sequence and generating the keyboard key value random sequence and specifically comprises the following steps:
the shuffling algorithm is an arc4random algorithm; adopting arc4random to generate N different random numbers within the range of 0-N-1; keys in the safety keyboard sequentially correspond to the N random numbers; and traversing the keys in the safety keyboard, and assigning the key value of the random number position corresponding to the current key value.
Wherein, the encryption layer decrypts the ciphertext in the memory by using the key and aes128 encryption algorithm; the key is obtained by encrypting the character string spliced by the secure keyboard address and the fixed character string through an MD5 encryption algorithm.
Referring to fig. 1, the method for implementing the security keyboard of the iOS terminal device includes the following steps:
a000: the drawing layer draws the safety keyboard; drawing a safe keyboard layout by utilizing an API (application programming interface) provided by the iOS system and realizing the basic function of the safe keyboard; binding an interface of a security keyboard by changing inputView of a system input box;
a001: generating a random keyboard by the drawing layer; utilizing shuffling algorithm to disorder keyboard key value sequence and producing keyboard key value random sequence; sequentially assigning the random sequence of key values of the keyboard to each key class object in the keyboard to generate a random keyboard;
a002: encrypting the logic layer input content; monitoring key triggering on the security keyboard through a gesture UITapGestureRecognizer to acquire key values; the obtained key values are encrypted through an encryption layer and then stored in a memory; the encryption logic layer adds an "·" to the text attribute of UITextField;
the secure key trigger is monitored by the gesture UITApGestureRecognizer. When a user inputs the data for the first time, the key value is obtained through monitoring key triggering, and the ciphertext is obtained through encryption by the encryption algorithm and then stored in the memory. By means of the text attribute of UITextField, add one ". cndot." to reach the input function. When the user inputs or modifies the character string again, the character string in the memory is obtained through the encryption algorithm, the character string in the memory is added or modified, and the character string is stored in the memory again. When the character string is obtained through decryption, the length of the character string is obtained, and the corresponding length of 'DEG' is added in the input box, so that the effect of no reply is achieved.
The user's real data and display data are in the memory and input box, respectively, so deletion requires separate design. The specific implementation of the user deletion function: when the selected content exists, firstly acquiring a text selected range, deleting a text corresponding to the selected range in the decrypted memory text, and then deleting the corresponding text in a text box; when the cursor is at the head, the action is not executed; when the cursor is at other positions, the position of the cursor is firstly obtained, a character is deleted at the position of the cursor corresponding to the decrypted text, and then a "·" is reduced in the text box.
A003: the encryption layer encrypts the input content; the encryption layer encrypts the key and the encrypted object by adopting an aes128 encryption algorithm to obtain a ciphertext and stores the ciphertext in the memory;
the encryption algorithm adopted by the invention is the combination encryption of aes128 and MD5, aes is a symmetric encryption algorithm which can encrypt character strings and decrypt through salt, and MD5 is an asymmetric encryption algorithm which is used for generating an irreversible key. Because the encryption and the decryption are both in the running process of the program, the memory address of the security keyboard is not fixed when the security keyboard is started every time, but is fixed when the security keyboard is started. In the encryption process, the memory address of the current security keyboard is taken out and spliced with a fixed character string, then MD5 encryption is carried out, the value encrypted by MD5 is used as a key and an object to be encrypted (namely, an input password) to carry out aes encryption, and the encrypted value is stored in the memory. And (3) decryption process: the memory address of the current security keyboard and the fixed word string MD5 are obtained through the method, the key is obtained after encryption, and the ciphertext in the memory is decrypted through the key and the aes algorithm.
A004: the anti-screen-capture logic layer realizes anti-screen capture; the user-defined notification is used for monitoring user screen capture and binding with an event;
firstly, registering a notice of UI application UserDidTakeScheenchotNotification in a self-defined keyboard code function; binding notifications and events. The notification is primarily used to monitor user screenshots. The event comprises the functions of clearing the input contents and the encrypted data in the memory, generating a new random sequence of key values of the keyboard, popping up a bullet box, prompting that the screen is currently captured, and not capturing the screen when sensitive information is input.
A005: the interface layer provides interface calling to the outside; self-defining iOS input text box MMDEncyptTextField and binding a security keyboard; adding an interface for acquiring the encrypted actual input content, and canceling the functions of pasting and cutting the input text box according to the length; if the plaintext approach is used: firstly, importing a header file import 'MMDKeyboardmanager.h' and binding textfield; when the ciphertext mode is used: the header file import "MMDEncyptTextField.h" is imported first, and the user-defined MMDEncyptTextField is directly used.
The basic functions of the safety keyboard comprise the display, switching and closing of a numeric keyboard, an alphabetic keyboard and a symbolic keyboard.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
In addition, those skilled in the art can understand that all or part of the steps in the method for implementing the embodiments described above can be implemented by a program to instruct the relevant hardware.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (3)
- An iOS terminal device security keyboard, comprising: the system comprises a drawing layer, an encryption logic layer, an anti-screenshot logic layer and an interface layer; wherein:the safety keyboard drawn by the drawing layer comprises a numeric keyboard, an alphabetic keyboard and a symbol keyboard; the drawing layer generates a keyboard key value random sequence by disordering the keyboard key value sequence through a shuffling algorithm; the drawing layer sequentially assigns the random sequence of the key values of the keyboard to each key class object in the keyboard to generate a random keyboard;the encryption layer adopts aes128 and MD5 to encrypt in a combined mode; the encryption layer encrypts the key and the encrypted object by adopting an aes128 encryption algorithm to obtain a ciphertext and stores the ciphertext in the memory; the encryption layer encrypts a character string obtained by splicing the address of the security keyboard and the fixed character string by adopting the MD5 encryption algorithm to obtain a key;the encryption logic layer monitors key triggering on the security keyboard through a gesture UITapGestureRecognizer to acquire key values; the obtained key values are encrypted through an encryption layer and then stored in a memory; the encrypt logic layer adds an "·" to the text attribute of UITextField;the anti-screen-capture logic layer self-defined notification is used for monitoring user screen capture; the notification is bound to an event; the event comprises clearing input content and encrypted data in a corresponding memory, and generating a new random sequence of keyboard key values;the interface layer self-defines an iOS input text box MMDEncyptTextField and binds a security keyboard; the interface layer is additionally provided with an interface for acquiring the encrypted actual input content;the drawing layer defines key classes and realizes key class objects with the same number as the number of keys in the keyboard; the drawing layer acquires the position of the key class object and adds the key class object to the corresponding position of the view of the display container to generate a safety keyboard; the keyboard key value sequence comprises a numeric keyboard key value sequence, an alphabetic keyboard key value sequence and a symbol keyboard key value sequence which sequentially correspond to a numeric keyboard, an alphabetic keyboard and a symbol keyboard;the shuffling algorithm for disordering the keyboard key value sequence to generate the keyboard key value random sequence specifically comprises the following steps:the shuffling algorithm is an arc4random algorithm; generating N different random numbers within the range of 0-N-1 by adopting the arc4 random; keys in the safety keyboard sequentially correspond to the N random numbers; traversing the keys in the safety keyboard, and assigning the key value of the random number position corresponding to the current key value;the encryption layer decrypts the ciphertext in the memory by using a secret key and an aes128 encryption algorithm; the key is obtained by encrypting the character string spliced by the secure keyboard address and the fixed character string through an MD5 encryption algorithm.
- 2. The method for implementing the secure keyboard of the iOS terminal device according to claim 1, characterized by comprising the steps of:a000: the drawing layer draws the safety keyboard; drawing a safe keyboard layout by utilizing an API (application programming interface) provided by the iOS system and realizing the basic function of the safe keyboard; binding an interface of a security keyboard by changing inputView of a system input box;a001: generating a random keyboard by the drawing layer; utilizing shuffling algorithm to disorder keyboard key value sequence and producing keyboard key value random sequence; sequentially assigning the random sequence of key values of the keyboard to each key class object in the keyboard to generate a random keyboard;a002: encrypting the logic layer input content; monitoring key triggering on the security keyboard through a gesture UITapGestureRecognizer to acquire key values; the obtained key values are encrypted through an encryption layer and then stored in a memory; the encrypt logic layer adds an "·" to the text attribute of UITextField;a003: the encryption layer encrypts the input content; the encryption layer encrypts the key and the encrypted object by adopting an aes128 encryption algorithm to obtain a ciphertext and stores the ciphertext in the memory;a004: the anti-screen-capture logic layer realizes anti-screen capture; the user-defined notification is used for monitoring user screen capture and binding with an event;a005: the interface layer provides interface calling to the outside; self-defining iOS input text box MMDEncyptTextField and binding a security keyboard; adding an interface for acquiring the encrypted actual input content, and canceling the functions of pasting and cutting the input text box according to the length; if the plaintext approach is used: firstly, importing a header file import 'MMDKeyboardmanager.h' and binding textfield; when the ciphertext mode is used: the header file import "MMDEncyptTextField.h" is imported first, and the user-defined MMDEncyptTextField is directly used.
- 3. The method of claim 2, wherein the basic security keyboard functions include display, switching and closing of a numeric keyboard, an alphanumeric keyboard and a symbolic keyboard.
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| CN106709362A (en) * | 2016-12-06 | 2017-05-24 | 武汉斗鱼网络科技有限公司 | File encryption method and device and file decryption method and device |
| CN107657187A (en) * | 2017-09-29 | 2018-02-02 | 百富计算机技术（深圳）有限公司 | A kind of keyboard and input method and system applied to android system |
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| CN103745174A (en) * | 2013-12-30 | 2014-04-23 | 飞天诚信科技股份有限公司 | Safety keyboard working method |
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Effective date of registration: 20210818 Address after: No. 373, Jiangdong Middle Road, Jianye District, Nanjing, Jiangsu 210000 Applicant after: Zijin Property Insurance Co.,Ltd. Address before: 518000 407, block C, HUAHAN Innovation Park, No. 16, Langshan Road, Yuehai street, Nanshan District, Shenzhen, Guangdong Applicant before: SHENZHEN XIANGMI TECHNOLOGY Co.,Ltd. |
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