with Delphi write a simple encryption and decryption algorithms, in particular : input string, n from the characters, not characters interval k taken out and then added to the remaining characters taken out behind the formation of ciphertext. then declassified

加密
....\Project1.cfg
....\Project1.dof
....\Project1.dpr
....\Project1.res
....\Unit1.dcu
....\Unit1.ddp
....\Unit1.dfm
....\Unit1.pas
....\加密.exe
解密
....\Project1.cfg
....\Project1.dof
....\Project1.dpr
....\Project1.res
....\Unit1.dcu
....\Unit1.ddp
....\Unit1.dfm
....\Unit1.pas
....\解密.exe

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