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SRSI_2 > Cryptography Lab > Flashcards

Cryptography Lab Flashcards

1
Q

What is the primary use of OpenSSL?

A. To manage public-key infrastructures.
B. To implement cryptographic functions.
C. To compress encrypted files.
D. To store cryptographic keys securely.

A

B

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2
Q

Which command generates a private key using OpenSSL?

A. openssl genrsa
B. openssl enc
C. openssl sign
D. openssl x509

A

A

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3
Q

Which library is a fork of OpenSSL?

A. BoringSSL
B. GnuPG
C. LibreSSL
D. Crypto++

A

C

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4
Q

What is the main characteristic of symmetric cryptography?

A. It uses a public and private key pair.
B. It uses the same key for encryption and decryption.
C. It only works on plaintext.
D. It requires a Certificate Authority (CA).

A

B

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5
Q

Which command encrypts a file using AES in OpenSSL?

A. openssl genrsa
B. openssl dgst
C. openssl enc
D. openssl hash

A

C

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6
Q

Which of the following is a symmetric encryption algorithm?

A. RSA
B. AES
C. ECC
D. Diffie-Hellman

A

B

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7
Q

What is a key feature of asymmetric cryptography?

A. Uses the same key for encryption and decryption.
B. Requires no keys for encryption.
C. Uses a public and private key pair.
D. Encrypts only small amounts of data.

A

C

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8
Q

Which algorithm is commonly used in asymmetric cryptography?

A. AES
B. RSA
C. DES
D. MD5

A

B

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9
Q

What does the openssl rsautl command do?

A. Generates RSA keys.
B. Signs a message using RSA.
C. Encrypts or decrypts data using RSA.
D. Creates a self-signed certificate.

A

C

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10
Q

What is the primary purpose of a hash function?

A. To compress data.
B. To verify data integrity.
C. To encrypt data.
D. To generate keys.

A

B

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11
Q

Which of these is a common cryptographic hash algorithm?

A. RSA
B. AES
C. SHA-256
D. Diffie-Hellman

A

C

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12
Q

What does the openssl dgst command do?

A. Encrypts a file.
B. Generates a hash.
C. Creates a private key.
D. Validates a digital certificate.

A

B

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13
Q

What is the primary advantage of ECC over RSA?

A. Faster encryption.
B. Requires shorter keys for equivalent security.
C. Uses symmetric encryption.
D. Supports larger ciphertexts.

A

B

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14
Q

What type of cryptography is ECC classified as?

A. Symmetric
B. Asymmetric
C. Hash-based
D. Quantum-resistant

A

B

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15
Q

Which command is used to generate an ECC key pair in OpenSSL?

A. openssl genrsa
B. openssl ecparam
C. openssl enc
D. openssl sign

A

B

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16
Q

What is the primary purpose of Diffie-Hellman?

A. Encrypting data.
B. Hashing data.
C. Secure key exchange.
D. Creating digital signatures.

A

C

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17
Q

What mathematical problem underpins Diffie-Hellman?

A. Factoring large primes.
B. Solving discrete logarithms.
C. Modular addition.
D. Matrix multiplication.

A

B

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18
Q

Which OpenSSL command generates Diffie-Hellman parameters?

A. openssl genrsa
B. openssl dhparam
C. openssl enc
D. openssl x509

A

B

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19
Q

What is a primary purpose of a digital signature?

A. Compressing data.
B. Ensuring data integrity and authenticity.
C. Encrypting data.
D. Performing key exchanges.

A

B

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20
Q

Which algorithm is commonly used for creating digital signatures?

A. SHA-256
B. AES
C. RSA
D. MD5

A

C

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21
Q

What does the openssl dgst -sign command do?

A. Verifies a digital signature.
B. Signs data using a private key.
C. Encrypts data.
D. Generates a key pair.

A

B

22
Q

What is the primary role of a digital certificate?

A. To encrypt files.
B. To verify the identity of a public key holder.
C. To hash data for verification.
D. To generate symmetric keys.

A

B

23
Q

What is a Certificate Authority (CA)?

A. An organization that issues digital certificates.
B. A tool for encrypting data.
C. A private key generator.
D. A type of digital signature.

A

A

24
Q

Which command creates a self-signed certificate in OpenSSL?

A. openssl enc
B. openssl req -x509
C. openssl dhparam
D. openssl rsautl

A

B

25
Q

What is the primary use of S/MIME?

A. Encrypting files on disk.
B. Securing email communication.
C. Generating private keys.
D. Signing digital certificates.

A

B

26
Q

What type of cryptography does S/MIME primarily use?

A. Symmetric encryption.
B. Asymmetric encryption.
C. Hashing algorithms.
D. Steganography.

A

B

27
Q

Which command encrypts an email using OpenSSL?

A. openssl enc
B. openssl smime
C. openssl sign
D. openssl dhparam

A

B

28
Q

What is the primary function of SSL/TLS?

A. Encrypting network communication.
B. Hashing passwords for storage.
C. Generating symmetric keys.
D. Compressing large files.

A

A

29
Q

Which protocol replaced SSL?

A. TLS
B. IPSec
C. HTTPS
D. S/MIME

A

A

30
Q

What is the purpose of a cipher suite in TLS?

A. To generate keys for encryption.
B. To define encryption and authentication algorithms.
C. To verify digital certificates.
D. To hash passwords for authentication.

A

B

31
Q

What does OCSP stand for?

A. Online Certificate Signing Protocol.
B. Online Certificate Status Protocol.
C. OpenSSL Certificate Signing Protocol.
D. Open Certificate Secure Protocol.

A

B

32
Q

What is the primary function of OCSP?

A. To validate digital signatures.
B. To check the revocation status of a certificate.
C. To generate private keys.
D. To compress certificate data.

A

B

33
Q

Which command checks certificate status using OCSP in OpenSSL?

A. openssl req
B. openssl ocsp
C. openssl x509
D. openssl dgst

A

B

34
Q

What is a key feature of ECC compared to RSA?

A. It requires a Certificate Authority (CA).
B. It is faster but less secure than RSA.
C. It provides equivalent security with shorter keys.
D. It is only used for hashing.

A

C

35
Q

Which mathematical concept is foundational to ECC?

A. Prime factorization.
B. Elliptic curves over finite fields.
C. Discrete Fourier Transform.
D. Modular exponentiation.

A

B

36
Q

What does S/MIME provide for email communication?

A. Encryption and digital signing.
B. Data compression and decryption.
C. Key generation and certificate revocation.
D. Symmetric key exchange.

A

A

37
Q

Which file format is commonly used for S/MIME certificates?

A. PEM
B. DER
C. PKCS#12
D. All of the above

A

D

38
Q

What is the purpose of a TLS handshake?

A. To encrypt data before transmission.
B. To establish a secure connection and exchange keys.
C. To hash passwords for storage.
D. To validate the client’s IP address.

A

B

39
Q

Which command generates a certificate signing request (CSR) in OpenSSL?

A. openssl enc
B. openssl req -new
C. openssl x509
D. openssl genrsa

A

B

40
Q

What is the OpenSSL command to display the details of a certificate?

A. openssl req -new
B. openssl enc -decrypt
C. openssl x509 -in certificate.pem -text
D. openssl verify

A

C

41
Q

Which command encrypts a file with AES-256-CBC in OpenSSL?

A. openssl genrsa -aes256
B. openssl enc -aes-256-cbc -in file.txt -out file.enc
C. openssl dhparam -aes256
D. openssl x509 -aes256

A

B

42
Q

How do you decrypt a file encrypted with AES in OpenSSL?

A. openssl aes -decrypt -in file.enc -out file.txt
B. openssl enc -d -aes-256-cbc -in file.enc -out file.txt
C. openssl enc -decrypt -in file.enc -out file.txt
D. openssl aes -d -in file.enc -out file.txt

A

B

43
Q

What is the OpenSSL command to generate an RSA key pair?

A. openssl req -x509
B. openssl enc -rsa
C. openssl genrsa -out private.key 2048
D. openssl rsa -generate

A

C

44
Q

Which command extracts the public key from an RSA private key?

A. openssl rsa -in private.key -pubout -out public.key
B. openssl genrsa -pubkey -out public.key
C. openssl x509 -pubout -key private.key
D. openssl enc -pubkey -out public.key

A

A

45
Q

How do you use OpenSSL to encrypt data with an RSA public key?

A. openssl rsa -encrypt -in file.txt -out file.enc
B. openssl rsautl -encrypt -inkey public.key -pubin -in file.txt -out file.enc
C. openssl enc -rsa -in file.txt -out file.enc
D. openssl genrsa -encrypt -out file.enc

A

B

46
Q

What is the OpenSSL command to decrypt data encrypted with RSA?

A. openssl rsa -decrypt -in file.enc -out file.txt
B. openssl genrsa -decrypt -in file.enc -out file.txt
C. openssl rsautl -decrypt -inkey private.key -in file.enc -out file.txt
D. openssl enc -decrypt -rsa -in file.enc -out file.txt

A

C

47
Q

Which OpenSSL command generates a SHA-256 hash of a file?

A. openssl dgst -sha256 file.txt
B. openssl enc -sha256 file.txt
C. openssl genhash -sha256 file.txt
D. openssl x509 -hash -sha256 file.txt

A

A

48
Q

How do you verify the integrity of a file using its hash in OpenSSL?

A. openssl verify -sha256 file.txt
B. openssl dgst -sha256 -verify signature.sig -signature hash file.txt
C. openssl enc -verify -hash file.txt
D. openssl hash -verify -sha256 file.txt

A

B

49
Q

Which command creates a digital signature for a file using OpenSSL?

A. openssl rsa -sign -in file.txt -out signature.sig
B. openssl dgst -sha256 -sign private.key -out signature.sig file.txt
C. openssl enc -sign -key private.key -out signature.sig file.txt
D. openssl sign -key private.key -in file.txt -out signature.sig

A

B

50
Q

How do you verify a digital signature with OpenSSL?

A. openssl verify -signature signature.sig -pubin public.key -in file.txt
B. openssl rsa -verify -in file.txt -signature signature.sig -pubkey public.key
C. openssl dgst -sha256 -verify public.key -signature signature.sig file.txt
D. openssl enc -verify -sha256 -key public.key -signature signature.sig -in file.txt

A

C

SRSI_2 (6 decks)

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