encrypt and decrypt

i am new to c++ and my instructor has assigned us the following problem
"you are to write a program the reads a file name quote.dat and encrypts it to a file called encypt_quote.dat. then the program must read encyp_quote.dat, decrypt it, and save it to a file called decryp_quote.dat after the program runs i must be able to see all three files

not asking for someone to write the code for me, but looking for something to go on. any help is appreciated

Choose encryption algorithm first
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