Types of attack on cryptosystems

Write 600 words that respond to the following questions:

Which type of attack on cryptosystems involves using a collection of pre-identified term?

Which kind of attack involves sequential guessing of all possible key combinations? Explain your answer with examples.

Please note:

Provide at least two references to support your initial post.

Be 600–700 words long (not including title and references).

Do not restate the questions.