Mission Logs

Tell it not to hand you the answer but to work it out together with you — turning it from an answer-vending machine into a tutor that keeps you doing the thinking. * Vend the answer and your brain sits out; make the tool hint and question, and you stay the one reasoning. * The f...

Quiz: CTIU / Introduction to Critical Thinking | updated: Aug 03, 2026

Because a knowledge-claim asserts validity for everyone, not just for you — and a "truth" that holds only for me is just an opinion wearing a disguise. The material (citing Ostritsch) draws a line between mere opinion and a knowledge-claim. When you say "I know X," you're not jus...

Quiz: CTIU / Handling Information & Bullshit | updated: Aug 02, 2026

A correlation only says X and Y move together; it leaves the causal direction — and whether a hidden third factor drives both — completely open. * One correlation, six causal stories — the data alone can't tell them apart. * A real study once found a striking correlation (r = 0....

Quiz: CTIU / Handling Information & Bullshit | updated: Aug 02, 2026

A provably secure cryptosystem is one where breaking the cipher is mathematically proven to be as hard as solving a known hard problem — the Rabin system has this property, but RSA does not. Rabin cryptosystem: Breaking Rabin is provably equivalent to solving the integer factori...

Quiz: KRYPTOG / Introduction to Cryptology | updated: Aug 02, 2026

Authentisierung is the process of verifying identity; Authentizität is the property of being genuine. One is an action, the other is a state. According to the BSI (Bundesamt für Sicherheit in der Informationstechnik — Germany's Federal Office for Information Security): Term Ty...

Quiz: KRYPTOG / Introduction to Cryptology | updated: Aug 02, 2026

The Vigenère cipher is a polyalphabetic substitution cipher that uses a keyword to shift each letter by a different amount, defeating simple frequency analysis. * Vigenere: a keyword gives each position its own shift. * Invented by Blaise de Vigenère in 1586 (building on ideas f...

Quiz: KRYPTOG / Introduction to Cryptology | updated: Aug 02, 2026

Non-repudiation of origin prevents a sender from denying they sent a message; non-repudiation of receipt prevents a receiver from denying they received it. The BSI distinguishes: Type German Protection against... Non-repudiation of origin Nichtabstreitbarkeit der Herkunft...

Quiz: KRYPTOG / Introduction to Cryptology | updated: Aug 02, 2026

Frequency analysis exploits the fact that in any language, certain letters appear more often — so the most frequent letter in ciphertext likely corresponds to the most common letter in the language. * Letter frequencies survive a monoalphabetic cipher and give away the key. * Ho...

Quiz: KRYPTOG / Introduction to Cryptology | updated: Aug 02, 2026

MPC allows multiple parties to jointly compute a function over their private inputs without revealing those inputs to each other — replacing the need for a trusted third party. * Secure multi-party salary averaging: a random offset R hides each input. * The classic example (sala...

Quiz: KRYPTOG / Introduction to Cryptology | updated: Aug 02, 2026

The Kasiski test (1863) was the first modern cryptanalytic method — it broke the Vigenère cipher that had been considered unbreakable for nearly 300 years. * The Kasiski test: repeated sequences to distances to GCD to key length. * Published by Friedrich Wilhelm Kasiski in 1863,...

Quiz: KRYPTOG / Introduction to Cryptology | updated: Aug 02, 2026