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CompTIA Security+ 4
| Question | Answer |
|---|---|
| What is the biggest drawback to symmetric encryption? | The key must be securely shared. This can be complicated because long keys are required for good security. |
| What is Diffie-Hellman most cominly used for? | To protect the exchange of keys used to create a connection using symmetric encryption. It is often used in TLS for protecting secure web pages. |
| What is AES meant to replace? | Advanced Encryption Standard is designed to replace the old U.S. government standard DES. |
| What kind of encryption cannot be reversed? | Hash functions are one-way and cannot be reversed to provide the original plaintext. |
| What is public key encryption a more common name for? | Asymmetric encryption is another name for public key encryption. |
| How many bits are in a block of the SHA algorithm? | 512 bits make up a block in SHA. |
| How does elliptical curve cryptography work? | Elliptical curve cryptography uses two points to calculate a third point on the curve. |
| A good hash function is resistant to what? | A good hash algorithm is resistant to collisions, or two different inputs hashing to the same value. |
| How is 3DES an improvement over normal DES? | 3DES uses multpile keys and multiple encryption or decryption rounds to improve security over regular DES. |
| What is the best kind of key to have? | The best encryption key is one tht is long and rando, to reduce the predictability of the key. |
| What makes asymmetric encryption better than symmetric encryption? | In public cryptography, only the private kays are secret, so key management is built into the algorithm. |
| What kind of encryption does a digital signature use? | Digital signatures use hashing and asymmetric encryption. |
| What does differencial cryptanalysis require? | Differential cryptanalysis requires large amounts of plaintext and ciphertext. |
| What is a brute force attack? | Brute-forcing is the attempt to use every possible key to find the correct one. |
| What is key escrow? | When the government keeps a copy of your private key, this is typically referred to as key escrow. |
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