I feel like that isn’t exactly a very useful definition of plaintext. If you mean “ASCII” say ASCII.
Plain text is text intended to be interpreted as bytes that map simply to characters. Complexity is irrelevant.
Plain text is text intended to be interpreted as bytes that map simply to characters. Complexity is irrelevant.
With the advent of computing, the term plaintext expanded beyond human-readable documents to mean any data, including binary files, in a form that can be viewed or used without requiring a key or other decryption device. Information—a message, document, file, etc.—if to be communicated or stored in an unencrypted form is referred to as plaintext.
Unencrypted information that may be input to an encryption operation. Note: Plain text is not a synonym for clear text. See clear text.
Intelligible data that has meaning and can be understood without the application of decryption.It is worse than that; you can also get different characters with the same code points, and also same code points and characters that should be different according to some uses, and also different code points and characters that should be same according to some uses, etc.