This lab must be done in C++Assignment:In cryptography, encryption is the process of encoding a message or information in such a way that only authorized parties can access it. In this lab you will write a program to decode a message that has been encrypted. Detailed specifications:Define three classes. Each one should be in a separate file. You can choose to define the class and its functions inline, all in a header file, or have a .h and .cpp file for each class.Abstract base class with the following:A variable to hold an encrypted message. This variable should be a string which is initialized in the constructor.A status variable that will tell whether the message was loaded successfully.A constructor that receives one parameter: a string variable with a file name and uploads its content to the string variable that is supposed to store it.A pure virtual function called decode. This function will be defined in derived classes.A function that prints the message on the screenA derived class that implements a version of decode according to the following algorithm:input character: abcdefghijklmnopqrstuvwxyzdecoded character: iztohndbeqrkglmacsvwfuypjxThat means each 'a' in the input text should be replaced with an 'i', each 'b' with a 'z' and so forth.A second derived class that implements a version of decode accordingalgorithm known as "rotational cypher". In this encryption method, a key is added to each letter of the original text. For example:Cleartext: A P P L E Key: 4 4 4 4 4Ciphertext: E T T P IIn order to decode, you need to subtract 4.I will provide a program that tests your classes. Testing/Output:Please use the following files as input text files: EncryptedA.txt and EncryptedB.txtInput Files Content to easily copy:EncryptedA.txt (Content is paragraph right below):ifqkwxcadf ar cei fpoi masif cd cei xkdqirr du pxxnwafm pf pnmdkaceo cd p oirrpmi, teaqe rqkpohnir cei gpcp af ac-oplafm ac sikw gauuaqvnc pfg caoi qdfrvoafm, au fdc xkpqcaqpnnw aoxdrrahni, cd gigvqi cei dkamafpn masif dfnw cei ifqdgig gpcp. afxvcr cd cei pnmdkaceo cwxaqpnnw afsdnsi pggacadfpn riqkic gpcp qpnnig liwr, teaqe xkisifcr cei oirrpmi ukdo hiafm giqdgig-isif au cei pnmdkaceo ar xvhnaqnw lfdtf.EncryptedB.txt (Content is paragraph right below):mr e wdqqixvmg irgvdtxmsr epksvmxlq, fsxl xli wirhiv erh xli vigmtmirx ywi xli weqi oid (orsbr ew xli wigvix oid) xs irgvdtx erh higvdtx xli qiwweki. sri aivd fewmg wdqqixvmg irgvdtxmsr epksvmxlq mw orsbr ew xli vsxexmsrep gmtliv. mr xlmw epksvmxlq, xli wirhiv wmqtpd "ehhw" xli oid xs iegl glevegxiv sj xli gpievxicx qiwweki xs jsvq xli gmtlivxicx. jsv iceqtpi, mj xli oid mw 2, "e" bsyph figsqi "g", "f" bsyph figsqi "h", erh ws sr. xli vigmtmirx bsyph xlir higvdtx xli qiwweki fd "wyfxvegxmrk" xli oid jvsq iegl glevegxiv sj xli gmtlivxicx xs sfxemr xli svmkmrep qiwweki. The output should be printed on the screen. Attach the output of your program as a comment at the end of your source code. Turn in:Encrypted.h, CypherA.h and CypherB.h (corresponding .cpp files optional) EncryptedA.txtDownload EncryptedA.txt (407 Bytes)ZOOMifqkwxcadf ar cei fpoi masif cd cei xkdqirr du pxxnwafm pf pnmdkaceo cd poirrpmi, teaqe rqkpohnir cei gpcp af ac-oplafm ac sikw gauuaqvnc pfg caoiqdfrvoafm, au fdc xkpqcaqpnnw aoxdrrahni, cd gigvqi cei dkamafpn masifdfnw cei ifqdgig gpcp. afxvcr cd cei pnmdkaceo cwxaqpnnw afsdnsipggacadfpn riqkic gpcp qpnnig liwr, teaqe xkisifcr cei oirrpmi ukdo hiafmgiqdgig-isif au cei pnmdkaceo ar xvhnaqnw lfdtf. EncryptedB.txtDownload EncryptedB.txt (577 Bytes)mr e wdqqixvmg irgvdtxmsr epksvmxlq, fsxl xli wirhiv erh xli vigmtmirx ywixli weqi oid (orsbr ew xli wigvix oid) xs irgvdtx erh higvdtx xli qiwweki.sri aivd fewmg wdqqixvmg irgvdtxmsr epksvmxlq mw orsbr ew xli vsxexmsrepgmtliv. mr xlmw epksvmxlq, xli wirhiv wmqtpd "ehhw" xli oid xs ieglglevegxiv sj xli gpievxicx qiwweki xs jsvq xli gmtlivxicx. jsv iceqtpi, mjxli oid mw 2, "e" bsyph figsqi "g", "f" bsyph figsqi "h", erh ws sr. xlivigmtmirx bsyph xlir higvdtx xli qiwweki fd "wyfxvegxmrk" xli oid jvsqiegl glevegxiv sj xli gmtlivxicx xs sfxemr xli svmkmrep qiwweki.

Question

This lab must be done in C++Assignment:In cryptography, encryption is the process of encoding a message or information in such a way that only authorized parties can access it. In this lab you will write a program to decode a message that has been encrypted. Detailed specifications:Define three classes. Each one should be in a separate file. You can choose to define the class and its functions inline, all in a header file, or have a .h and .cpp file for each class.Abstract base class with the following:A variable to hold an encrypted message. This variable should be a string which is initialized in the constructor.A status variable that will tell whether the message was loaded successfully.A constructor that receives one parameter: a string variable with a file name and uploads its content to the string variable that is supposed to store it.A pure virtual function called decode. This function will be defined in derived classes.A function that prints the message on the screenA derived class that implements a version of decode according to the following algorithm:input character: abcdefghijklmnopqrstuvwxyzdecoded character:  iztohndbeqrkglmacsvwfuypjxThat means each 'a' in the input text should be replaced with an 'i', each 'b' with a 'z' and so forth.A second derived class that implements a version of decode accordingalgorithm known as &#34;rotational cypher&#34;. In this encryption method, a key is added to each letter of the original text. For example:Cleartext:        A    P    P    L    E          Key:       4    4    4    4    4Ciphertext:      E    T    T    P    IIn order to decode, you need to subtract 4.I will provide a program that tests your classes. Testing/Output:Please use the following files as input text files: EncryptedA.txt and EncryptedB.txtInput Files Content to easily copy:EncryptedA.txt (Content is paragraph right below):ifqkwxcadf ar cei fpoi masif cd cei xkdqirr du pxxnwafm pf pnmdkaceo cd p oirrpmi, teaqe rqkpohnir cei gpcp af ac-oplafm ac sikw gauuaqvnc pfg caoi qdfrvoafm, au fdc xkpqcaqpnnw aoxdrrahni, cd gigvqi cei dkamafpn masif dfnw cei ifqdgig gpcp. afxvcr cd cei pnmdkaceo cwxaqpnnw afsdnsi pggacadfpn riqkic gpcp qpnnig liwr, teaqe xkisifcr cei oirrpmi ukdo hiafm giqdgig-isif au cei pnmdkaceo ar xvhnaqnw lfdtf.EncryptedB.txt (Content is paragraph right below):mr e wdqqixvmg irgvdtxmsr epksvmxlq, fsxl xli wirhiv erh xli vigmtmirx ywi xli weqi oid (orsbr ew xli wigvix oid) xs irgvdtx erh higvdtx xli qiwweki. sri aivd fewmg wdqqixvmg irgvdtxmsr epksvmxlq mw orsbr ew xli vsxexmsrep gmtliv. mr xlmw epksvmxlq, xli wirhiv wmqtpd &#34;ehhw&#34; xli oid xs iegl glevegxiv sj xli gpievxicx qiwweki xs jsvq xli gmtlivxicx. jsv iceqtpi, mj xli oid mw 2, &#34;e&#34; bsyph figsqi &#34;g&#34;, &#34;f&#34; bsyph figsqi &#34;h&#34;, erh ws sr. xli vigmtmirx bsyph xlir higvdtx xli qiwweki fd &#34;wyfxvegxmrk&#34; xli oid jvsq iegl glevegxiv sj xli gmtlivxicx xs sfxemr xli svmkmrep qiwweki. The output should be printed on the screen. Attach the output of your program as a comment at the end of your source code. Turn in:Encrypted.h, CypherA.h and CypherB.h (corresponding .cpp files optional) EncryptedA.txtDownload EncryptedA.txt (407 Bytes)ZOOMifqkwxcadf ar cei fpoi masif cd cei xkdqirr du pxxnwafm pf pnmdkaceo cd poirrpmi, teaqe rqkpohnir cei gpcp af ac-oplafm ac sikw gauuaqvnc pfg caoiqdfrvoafm, au fdc xkpqcaqpnnw aoxdrrahni, cd gigvqi cei dkamafpn masifdfnw cei ifqdgig gpcp. afxvcr cd cei pnmdkaceo cwxaqpnnw afsdnsipggacadfpn riqkic gpcp qpnnig liwr, teaqe xkisifcr cei oirrpmi ukdo hiafmgiqdgig-isif au cei pnmdkaceo ar xvhnaqnw lfdtf. EncryptedB.txtDownload EncryptedB.txt (577 Bytes)mr e wdqqixvmg irgvdtxmsr epksvmxlq, fsxl xli wirhiv erh xli vigmtmirx ywixli weqi oid (orsbr ew xli wigvix oid) xs irgvdtx erh higvdtx xli qiwweki.sri aivd fewmg wdqqixvmg irgvdtxmsr epksvmxlq mw orsbr ew xli vsxexmsrepgmtliv. mr xlmw epksvmxlq, xli wirhiv wmqtpd &#34;ehhw&#34; xli oid xs ieglglevegxiv sj xli gpievxicx qiwweki xs jsvq xli gmtlivxicx. jsv iceqtpi, mjxli oid mw 2, &#34;e&#34; bsyph figsqi &#34;g&#34;, &#34;f&#34; bsyph figsqi &#34;h&#34;, erh ws sr. xlivigmtmirx bsyph xlir higvdtx xli qiwweki fd &#34;wyfxvegxmrk&#34; xli oid jvsqiegl glevegxiv sj xli gmtlivxicx xs sfxemr xli svmkmrep qiwweki.

Accepted Answer

Actually, c++ is  a powerful general purpose language.