The statements that describe encryption are:
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A way to protect data at rest from theft or disclosure - This describes how encryption is used to secure stored data.
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A way to send data between two points, securely - This describes the use of encryption in securing data in transit, ensuring that it can only be read by the intended recipients.
The other options do not accurately describe encryption:
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A uniform length, one-way value calculated from an input - This describes a hash function, not encryption.
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Algorithms designed to make your computer hard to exploit - This is more related to security measures or practices rather than encryption specifically.
So, the correct answers are the second and fourth statements.