CRIPTO
University
•24 Qs
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CRIPTO
Quiz
•
Information Technology (IT)
•
University
•
Practice Problem
•
Easy
Guțui-Maftei Alexandra
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24 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ce presupune tehnica steganografica LSB?
Plaseaza mesajul secret in header-ul mesajului purtator
Adauga mesajul secret in secventele de biti 0 din mesajul purtator
Foloseste cele mai putin semnificative pozitii binare ale mesajului purtator pentru a stoca mesajul secret, dar fara a modifica natura mesajului purtator
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ce metoda de criptare poate obtine “criptarea perfecta”?
One-time pad
Cifruri de transpozitie
Cifrul Cezar
Cifruri de transpozitie
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cifru de substitutie in care un simbol din textul in clar poate fi inlocuit cu diferite simboluri cifrate de-a lungul procesului de criptare
CIFRU POLIALFABETIC
CIFRU MONOALFABETIC
cifru de bloc
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Care este ordinea corecta a pasilor de urmat in cazul utilizarii criptarii simetrice pentru trimiterea unui mesaj?
1. Alice cripteaza mesajul ei folosind cheia secreta, mesaj pe care il trimite lui Bob
2. Alice si Bob cad de acord asupra unui sistem criptografic simetric (cu cheie secreta) si asupra unei chei (cunoscuta dinainte sau primita printr-un canal de comunicatie)
3. Bob decripteaza mesajul lui Alice, folosind cheia secreta
2-1-3
1-3-2
1-2-3
2-3-1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Care este operatia logica folosita de algoritmii de criptare simetrica?
SAU
SI
SAU EXCLUSIV
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ce fel de transformari utilizeaza un criptosistem simetric bazat pe o retea Feistel?
P-Box, S-Box si XOR
SubBytes si MixColumns
RC6 si MARS
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ce problema a modului de operare ECB (electronic codebook) rezolva modul de operare CBC (cipher block chaining)?
Ultimul bloc necesita padding
Acelasi bloc de text se va cripta intotdeauna in acelasi bloc de criptotext
Nu se poate folosi opertia XOR
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