cmp tips — authorized byte-compare literacy

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For legal, authorized and educational use only. Only analyze software you own or have written permission to examine.
Quick answer

cmp helps authorized labs sample first-byte differences on files they own. Pair with cmp-binary-diff-tips, dd-tips, and cksum-tips. Prefer -s / -l on syllabus pairs — never private trees you may not read.

On this page

Snapshot

FieldValue
Surfacecmp tip checklist
JobAuthorized byte-compare literacy
binary-diff peercmp-binary-diff-tips
dd peerdd-tips
cksum peercksum-tips

Tip checklist (authorized only)

  1. Confirm you may read both files (lab VM / your sample / courseware).
  2. Prefer cmp -s A B; echo $? or cmp -l A B | head on syllabus pairs.
  3. Record exit status / first differing offset; quote short Evidence.
  4. Optional: copy then compare → dd-tips; checksum → cksum-tips.
  5. Optional: line-set peer → comm-tips; dump → od-tips.
  6. Optional: deeper binary framing → cmp-binary-diff-tips.
  7. Redact sensitive path labels before sharing.
  8. Stop at literacy — no secret-diff cookbooks.

Allowed framing

  • Classroom labs comparing two syllabus copies after a dd.
  • Binding cmp exit / offset notes as Evidence.
  • Documenting "cmp: EOF on …" as a valid lab outcome.
  • Comparing cmp ↔ cksum / comm under one binder.

Scope we will not cover

  • No crack/pirate/keygen via cmp.
  • No unauthorized-access / side-channel compare PoCs.
  • No credential-theft via cmp of secret files.
  • No intentional cmp against trees you may not read.

Beginner path (authorized only)

  1. Obtain one syllabus-approved lab VM you control.
  2. Run echo a > /tmp/a; echo b > /tmp/b; cmp -s /tmp/a /tmp/b; echo $?; quote status.
  3. Bind cmp notes as Evidence; redact sensitive labels.
  4. Optional: compare with cksum-tips / dd-tips.
  5. Stop at literacy — no secret-probe cookbooks.
Which to pick
  • Prefer authorized, exit/offset, redacted Evidence.
  • Use dd / cksum / binary-diff peers when the syllabus asks.
  • No exploit, crack, or unauthorized-access framing.

For legal, authorized and educational use only.

FAQ

What is a "cmp tip" page in BinBench framing?

A checklist for byte-comparing authorized lab files on hosts you own — not a cookbook for probing secrets on hosts you do not control.

How does this relate to cmp-binary-diff-tips / dd-tips?

cmp-binary-diff-tips zooms binary-diff framing; dd-tips covers block copy. This page is the general cmp tip checklist — it does not overwrite those pages.

Can I cmp other users\' private files I do not have rights to?

No. Authorization first. BinBench will not publish unauthorized-access recipes.

Does this teach exploit / side-channel compare PoCs?

No. Mentions of exploit/side-channel appear only as refusals.

Does this teach credential theft via cmp tricks?

No. Redact path names before sharing.

Sources