Advanced › Module 4 › Lesson 4
Lab — Classic
Pack Caesar/Vigenère, XOR CTF, and freq analysis logs — classic cipher file from $CRYPTO_LAB only.
Visual · t28_classic_lab
Lab: classic cipher pack. $CRYPTO_LAB only. Original Cyberlium.
Opening
Classic pack merges three CTF toys — paperwork and flags before modern toy crypto module.
Lessons 4-1–4-3 covered Caesar/Vigenère, XOR CTF, and frequency analysis on YOUR plaintext. This lab merges classic CTF cards and freq log with M3 attack-class cross-reference and explicit YOUR-plaintext-only language. No stranger ciphertext — classic CTF paperwork and optional solver runs on toys you own. Next: Quiz — Classic Ciphers CTF.
1. Lab contract: classic cipher pack
Create $HOME/cyberlium-lab/t28-m04-l04-classic-lab.txt merging Caesar/Vigenère card, XOR CTF card, and freq analysis log with $CRYPTO_LAB toy filenames and planted flags.
Optional: paste recovered flag lines only — no full stranger message dumps.
Command guide
Try these commands — Lab contract: classic cipher pack
═══ LINUX / macOS (Terminal Practice) ═══
Check system state and user context
Command — copy this
id whoami uname -a
Inspect network sockets listening for connections
Command — copy this
ss -tuln 2>/dev/null || netstat -tuln
Audit active processes
Command — copy this
ps aux | grep -v "\[" | head -15
═══ WINDOWS (POWERSHELL) ═══ Query user identity and system information
Command — copy this
whoami /all Get-ComputerInfo | Select-Object CsName, OsName, OsVersion
Primary tools to practice this lesson: python3, grep. Reference sites: Frequency analysis (https://cryptopals.com/); CWE-327 (https://cwe.mitre.org/data/definitions/327.html); OpenSSL (https://www.openssl.org/). Run every command in the box — install first, then the usage lines — only on YOUR lab / program scope.
2. Cross-check ethics
Grep for classmate names, scraped chat paths, unauthorized firmware — remove. Pack must state YOUR-plaintext-only scope.
Confirm toys match M1 inventory source field.
3. Lock the proof
chmod 600 on the pack. Quiz next — then AES Modes Named.
Classic CTF literacy feeds modern openssl module in M5.
4. What you ship: classic cipher pack for $CRYPTO_LAB
Merged Caesar, XOR, freq sections with YOUR flags. $CRYPTO_LAB named. NO stranger ciphertext. chmod 600.
5. What you record before the next lesson
Date. Classic pack path. $CRYPTO_LAB named. File t28-m04-l04-classic-lab.txt chmod 600.
6. Wrong vs right: prod crypto oracles vs CTF toys
Worked failure — same MSF word, opposite target. Right never needs a café Wi-Fi or classmate laptop.
Wrong
Include decrypted stranger message in pack. Skip XOR toy section.
Right
Write YOUR classic cipher pack for $CRYPTO_LAB. chmod 600. Next: Quiz — Classic Ciphers CTF.
Mission: freeze YOUR classic cipher pack
1) Merge M4 CTF sections. 2) Confirm YOUR-plaintext-only language. 3) List three planted flags. 4) chmod 600.
Stuck? Ask Cyberlium AI Mentor
Three small toys beat one ambiguous scraped blob.
Knowledge Check
APPLY: This lab requires:
Multiple choice
Knowledge Check
APPLY: True or False: Classic lab must reference YOUR-plaintext-only scope.
True or False
Knowledge Check
APPLY: Classic pack should include:
Multiple choice