Ask a Question

The S-box value for byte stored in cell (B,3)

← Prev Question Next Question →
+1 vote
139 views
in Cryptograph & Network Security by (60.0k points)
The S-box value for byte stored in cell (B,3)

(a) 0x3C

(b) 0xB3

(c) 0x4F

(d) 0x90

This question was posed to me in an interview for internship.

Enquiry is from The AES Algorithm in division Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

1 Answer

+1 vote
by (1.2m points)
selected by
 
Best answer
Right choice is (b) 0xB3

To explain I would say: We first find the multiplicative inverse of 0xB3. The multiplicative inverse of 0xB3 is 0xEF. On performing the transformation on 0xEF we get 0x63.

Related questions

Welcome to TalkJarvis QnA, a question-answer community website for the people by the people. On TalkJarvis QnA you can ask your doubts, curiosity, questions and whatever going in your mind either related to studies or others. Experts and people from different fields will answer.

Most popular tags

biology – class 12 biology – class 11 construction & building materials chemistry – class 12 electronic devices & circuits network theory data structures & algorithms ii cell biology ic engine insurance finance money computational fluid dynamics engineering physics i discrete mathematics chemistry – class 11 aerodynamics casting-forming-welding i engineering mathematics operating system casting-forming-welding ii engineering drawing mysql engineering geology digital circuits wireless mobile energy management electrical measurements digital communications cyber security analytical instrumentation embedded systems electric drives cytogenetics computer fundamentals life sciences basic civil engineering advanced machining iot design of electrical machines physics – class 12 applied chemistry dairy engineering basic chemical engineering cloud computing microprocessor bioinformatics aircraft design aircraft maintenance software engineering drug biotechnology digital signal processing biochemistry data structures & algorithms i automotive engine design avionics engineering material & metallurgy energy engineering cognitive radio unix electrical machines biomedical instrumentation object oriented programming electromagnetic theory power electronics analog communications bioprocess engineering civil engineering drawing engineering metrology physics – class 11 mathematics – class 12 engineering chemistry i basic electrical engineering unit processes mongodb signals and systems cryptograph & network security hadoop mathematics – class 11 engineering physics ii html control systems engineering mechanics antennas analog circuits computer network java sql server javascript concrete technology chemical process calculation artificial intelligence design of steel structures c++ database management computer architecture engineering chemistry ii corrosion engineering chemical technology dc machines
Powered by TalkJarvis
...