## September 1, 2011

### What, you too? Part 1

**A** was a Dutch cryptographer who created a set of 6 rules for a certain kind of system. The 2nd of his set of 6 remained famous and relevant and was named after him.

**B** was an American mathematician, cryptographer, electrical engineer and all-round genius who, almost 100 years after **A**, formulated a variant of the same principle. This was in turn, named after **A** although they both largely mean the same! **B** was, of course, an incredibly prolific genius whose work, many believe, created the field of information theory and his papers are considered the most important papers of the 20th century. (consequently, **B** has featured on Boiledbeans _many_ times. So this is not a dupe :P)

Another interesting (unrelated) coincidence around **B** was with **C**. **B** proved a certain theorem in 1949 that is fundamental to the world of information theory. Unbeknownst to **B**, **C –** who was a Swedish-born American – had pretty much proved the same thing almost 20 years before. Funnily enough, almost half-a-dozen people independently proved this over time. But, by and large, the theorem is credit to both **B** and **C.**

Identify **A, B **and** C** for 1 point. No part points. Pseudo-bonus points for naming the set of 6 rules, the maxim, and the theorem :)

Cracked by: **grey_matters ** , username , Goyal , Sumanth Patlolla , buk , jowens , byslexia , KK , Raghuvansh , Siddarth Pai , Rogi , Thejas V R , Dibyo , shrik , Shwetha Maiya , Aditya S , badideabear , anurag , Rahulk , Bharath , Wm , rickde , Martin , amarendra , raklodramA , Ananth , Manish Achuth and Anjul

Answer:

A – Auguste Kerckhoffs

B – Claude Shanon

C – Harry Nyquist

*Points assigned by AutoRaja. Review by lazy humans pending.*

A- Kerckhoff

B- Claude E Shannon

C- Warren Weaver

A = Auguste Kerckhoffs

B = Claude Shannon

C = Harry Nyquist

The system should be, if not theoretically unbreakable, unbreakable in practice.

The design of a system should not require secrecy and compromise of the system should not inconvenience the correspondents (Kerckhoffs’ principle).

The key should be memorable without notes and should be easily changeable

The cryptograms should be transmittable by telegraph

The apparatus or documents should be portable and operable by a single person

The system should be easy, neither requiring knowledge of a long list of rules nor involving mental strain

A – Auguste Kerckhoffs

B – Claude Shannon

C – Harry Nyquist

A – Auguste Kerckhoffs

B – Claude Elwood Shannon

C – Harry Nyquist

1) The system should be, if not theoretically unbreakable, unbreakable in practice.

2) The design of a system should not require secrecy and compromise of the system should not inconvenience the correspondents (Kerckhoffs’ principle).

3) The key should be memorable without notes and should be easily changeable

4) The cryptograms should be transmittable by telegraph

5) The apparatus or documents should be portable and operable by a single person

6) The system should be easy, neither requiring knowledge of a long list of rules nor involving mental strain

Kerckhoffs’ principle was reformulated by Claude Shannon as “The enemy knows the system.”

Theorem : “A Mathematical Theory of Communication”

A – Auguste Kerckhoffs

B – Claude Shannon

C – Harry Nyquist

6 principles of designing ciphers

“the enemy knows the system”

the sampling theorem

A: Auguste Kerckhoffs

B: Claude Shannon

C: Harry Nyquist

“six principles of practical cipher design”

“Kerckhoffs’ principle”

“Nyquist–Shannon sampling theorem”

A. Auguste Kerckhoff

B. Claude Shannon

C. Harry Nyquist

A-Auguste Kerckhoffs

B-Claude Shannon

C-Harry Nyquist

A: Auguste Kerckhoffs, B: Claude Shannon, C: Harry Nyquist

A: Auguste Kerckhoff & Kerckhoff’s Principle

B: CLaude Shannon

C: Harry Nyquist

Nyquist–Shannon sampling theorem

A-Auguste Kerckhoffs

B-Claude Shannon

C-Harry Nyquist

A – Auguste Kerckhoffs

B – Claude Shannon

C – Harry Nyquist

Now, for the pseudo bonus points,

Kerckhoffs’ principles

Shannon’s maxim

Nyquist-Shannon Sampling theorem

a: auguste kerchoff

b: claude shannon

c: norbert weiner

A. Auguste Kerckhoffs

B. Claude Shannon

C. Harry Nyquist

Kerckhoff’s principle, Shannon’s maxim and the Nyquist-Shannon sampling theorem.

A – Auguste Kerckhoffs

B – Claude Shannon

C – Harry Nyquist

A – Auguste Kerckhoffs

B – Claude Shannon

C – Harry Nyquist

A is Auguste Kerckhoffs

B is Claude Shannon

C is Harry Nyquist

Six rules are: The system should be, if not theoretically unbreakable, unbreakable in practice.

The design of a system should not require secrecy and compromise of the system should not inconvenience the correspondents (Kerckhoffs’ principle).

The key should be memorable without notes and should be easily changeable

The cryptograms should be transmittable by telegraph

The apparatus or documents should be portable and operable by a single person

The system should be easy, neither requiring knowledge of a long list of rules nor involving mental strain

Maxim: The enemy knows the system.

Theorem: Nyquist Shannon sampling theorem

A=Auguste Kerckhoffs

B=Claude Shannon

C=Harry Nyquist

Set of 6 Rules:Kerckhoffs’ 6 principles of practical cipher design

Maxim: Shannon’s Maxim

Theorem: Nyquist–Shannon sampling theorem

A : Auguste Kerckhoffs

B : Claude Shannon

C : Harry Nyquist

Set of 6 rules : Kerckhoffs’s Principle

Maxim : Shannon’s maxim

Theorem : Nyquist–Shannon sampling theorem

since it was also discovered independently by E. T. Whittaker, by Vladimir Kotelnikov, and by others, it is also known as Nyquist–Shannon–Kotelnikov, Whittaker–Shannon–Kotelnikov, Whittaker–Nyquist–Kotelnikov–Shannon, WKS, etc., sampling theorem, as well as the Cardinal Theorem of Interpolation Theory.

A-Auguste Kerckhoffs

B-Claude Shannon

C-Harry Nyquist

Thanks for using the time and effort to write something so interesting.

My site:

le credit Rachat de credit

A- auguste kerckhoff

B- Claude Shannon

C- Harry Nyquist

Millitary Cryptography

Shannon’s maxim

Nyquist–Shannon sampling theorem

A) Auguste Kerckhoffs

B) Claude Shannon

C) Harry Nyquist

Kerchoffs principle which states that “The enemy knows the system.”

Auguste Kerckhoffs was A.

Claude Shannon was B.

Nyquist was C.

A- Auguste Kerckhoffs

B- Claude Shannon

C- Harry Nyquist

A: Auguste Kerckhoffs

B: Claude Shannon

C: Harry Nyquist

A – Auguste Kerckhoffs

B – Claude Shanon

C – Harry Nyquist

Name of the rule – Kerckhoffs Principle

A: Auguste Kerckhoffs

B: Claude Shannon

C: Harry Nyquist