YanoSec / Code
Representation module self-review case.
All transforms below are hand groupings, not observed tool output.

Item 1. Hex display: 52 55 4e
Bytes: 3
If those bytes are UTF-8/ASCII letters: R U N

Item 2. Declared code point U+00A9 COPYRIGHT SIGN, UTF-8 bytes c2 a9
Code points: 1
Bytes: 2
A successful decode recovers the declared character. It does not add a second meaning.

Item 3. Base64 UmVk, provenance says Base64 of a color name.
Operation: standard Base64 decode
Hand result: 52 65 64, UTF-8 letters Red
Record the operation. Do not call the step decryption.

Item 4. String 00ff, no provenance.
Hypothesis one: two hex bytes, 00 and ff.
Hypothesis two: four characters, 0 0 f f.
Missing evidence: a declared encoding or an algorithm name.
Hex digits do not prove a hash and do not prove a format.

Rubric: state the byte count, the operation you used, and the fact you still lack for item 4.