<span>A numeric string is created by a cryptographic
algorithm, which is called a hash that is used to validity of a message or authenticity
of a document. The signature is verified by an algorithm that uses the stated
owner of the signature's public key to accept or reject the authenticity of a
signature. A certification authority's digital signature is used to verify the
authenticity of digital certificates and other documents in a PKI.</span>
The answer you're looking for might be "backwards-compatible".
Answer:
They can help to explain the relationship between the output and input variables.
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Providing audio with images
Input device
A cpu processes all your programs
An input device is something like a keyboard or mouse, when you use it it inputs data to the computer
An output device is something like your headphones
Software is a program that you run like microsoft word