SSH Key Types: RSA and Ed25519 Quiz

1. Which file format is used to store public SSH keys in the authorized_keys file?

PEM format

OpenSSH format

DER format

PKCS#8 format

2. True or False: RSA and Ed25519 keys can be used interchangeably in SSH configuration files.

True

False

Submit

4. What is the default filename for the Ed25519 private key created by ssh-keygen?

Id_rsa

Id_ed25519

Id_ecdsa

Id_dsa

5. True or False: Ed25519 private keys are smaller than RSA 2048-bit private keys.

True

False

Submit

7. Which command displays the fingerprint of an SSH public key for verification?

Ssh-keygen -l -f keyfile

Ssh-keyscan -f keyfile

Ssh-verify keyfile

Ssh-fingerprint keyfile

8. True or False: Ed25519 is considered more resistant to side-channel attacks than RSA.

True

False

9. What is the recommended passphrase length for protecting SSH private keys?

At least 4 characters

At least 8 characters

At least 12 characters

Passphrases are optional

Submit

11. Which SSH key algorithm was released in 2011 and is considered more secure than RSA for the same key size?

Ed25519

DSA

ECDSA

DH

12. True or False: RSA keys are vulnerable to quantum computing attacks in the future.

True

False

Submit

14. Which SSH key type is backward compatible with older SSH implementations?

Ed25519

ECDSA

RSA

None of these

15. What is the primary cryptographic basis of Ed25519?

Integer factorization

Elliptic curve cryptography

Discrete logarithm problem

Hash-based signatures

16. True or False: Ed25519 keys are faster to generate and verify compared to RSA keys of equivalent security strength.

True

False

Submit

18. Which command generates a new Ed25519 SSH key pair?

Ssh-keygen -t rsa

Ssh-keygen -t ed25519

Ssh-keygen -t ecdsa

Ssh-keygen -t dsa

Submit

20. What is the standard key size for RSA keys recommended for modern SSH security?

512 bits

1024 bits

2048 bits or higher

256 bits

Linux+ V8 RSA and Ed25519 SSH Key Types Quiz

1. Which file format is used to store public SSH keys in the authorized_keys file?

2.

What first name or nickname would you like us to use?

2. True or False: RSA and Ed25519 keys can be used interchangeably in SSH configuration files.

3. The ssh-copy-id command appends a public key to the ____ file on the remote host.

4. What is the default filename for the Ed25519 private key created by ssh-keygen?

5. True or False: Ed25519 private keys are smaller than RSA 2048-bit private keys.

6. RSA signatures are generated using the ____ algorithm.

7. Which command displays the fingerprint of an SSH public key for verification?

8. True or False: Ed25519 is considered more resistant to side-channel attacks than RSA.

9. What is the recommended passphrase length for protecting SSH private keys?

10. Ed25519 uses the ____ elliptic curve for its operations.

11. Which SSH key algorithm was released in 2011 and is considered more secure than RSA for the same key size?

12. True or False: RSA keys are vulnerable to quantum computing attacks in the future.

13. The ssh-keygen utility stores private keys in ____ directory by default.

14. Which SSH key type is backward compatible with older SSH implementations?

15. What is the primary cryptographic basis of Ed25519?

16. True or False: Ed25519 keys are faster to generate and verify compared to RSA keys of equivalent security strength.

17. RSA key generation relies on the difficulty of factoring large ____ numbers.

18. Which command generates a new Ed25519 SSH key pair?

19. Ed25519 keys are typically ____ bits in length.

20. What is the standard key size for RSA keys recommended for modern SSH security?