Table of Contents
- 1 What is the weakness of symmetric encryption?
- 2 What’s the advantage and disadvantage of asymmetric encryption?
- 3 What are the two major problems with symmetric key cryptography?
- 4 What is the main problem with using symmetric algorithms?
- 5 Which of the following is a disadvantage of stream ciphers?
- 6 What is asymmetric and symmetric key cryptography?
- 7 Which is the best description of symmetric encryption?
- 8 When do you need a secret key in asymmetric cryptography?
What is the weakness of symmetric encryption?
Symmetric encryption is also called “secret key” encryption because the key must be kept secret from third parties. Strengths of this method include speed and cryptographic strength per bit of key; however, the major weakness is that the key must be securely shared before two parties may communicate securely.
What’s the advantage and disadvantage of asymmetric encryption?
Asymmetric encryption uses longer keys than symmetric encryption in order to provide better security than symmetric key encryption. While the longer key length in itself is not so much a disadvantage, it contributes to slower encryption speed.
What are some disadvantages of using the same key in symmetric cipher?
The disadvantage of symmetric encryption Symmetric encryption always use the same key for encryption and decryption – that is the very definition of it. That has one major downside. If the person doing the encryption and the decryption are not the same, they have to somehow securely share the key.
What is the disadvantage of using a public key algorithm compared to a symmetric algorithm?
What is an important disadvantage of using a public key algorithm compared to a symmetric algorithm? A symmetric algorithm is a faster process. A symmetric algorithm provides nonrepudiation of delivery. A symmetric algorithm is more diffi cult to implement.
What are the two major problems with symmetric key cryptography?
One big issue with using symmetric algorithms is the key exchange problem, which can present a classic catch-22. The other main issue is the problem of trust between two parties that share a secret symmetric key. Problems of trust may be encountered when encryption is used for authentication and integrity checking.
What is the main problem with using symmetric algorithms?
Which of the following are disadvantages of symmetric stream ciphers?
Disadvantages: Slowness of encryption: an entire block must be accumulated before encryption / decryption can begin. Error propogation: An error in one symbol may corrupt the entire block. An encryption algorithm is said to be malleable if transformations on the ciphertext produce meaningful changes in the plaintext.
What is problem in symmetric cryptography?
The biggest problem with symmetric key encryption is that you need to have a way to get the key to the party with whom you are sharing data. Encryption keys aren’t simple strings of text like passwords. They are essentially blocks of gibberish. As such, you’ll need to have a safe way to get the key to the other party.
Which of the following is a disadvantage of stream ciphers?
Disadvantages: Slowness of encryption: an entire block must be accumulated before encryption / decryption can begin. Error propogation: An error in one symbol may corrupt the entire block.
What is asymmetric and symmetric key cryptography?
Symmetric encryption uses a single key that needs to be shared among the people who need to receive the message while asymmetric encryption uses a pair of public key and a private key to encrypt and decrypt messages when communicating.
Are there any practical attacks on symmetric cryptography?
Current cryptographic algorithms for symmetric cryptography are generally rather secure. There are no practical attacks against AES, for instance. Of course it is completely possible to use the algorithms incorrectly. Symmetric ciphers are generally secure against quantum-analysis (with quantum computers).
What are the disadvantages of public key cryptography?
The need for a trusted third party is the major disadvantage of public key. The math for the crypto itself is more complicated, takes more processing power – but these days CPU cycles are pretty cheap on all but the dumbest of Internet of Things devices and not that big of an issue anymore.
Which is the best description of symmetric encryption?
The symmetric encryption is a cryptographic procedure, in which the encryption and decryption of a message is done with the same key (see picture). This implies that the participants have already exchanged keys before they start communicate with each other [1].
When do you need a secret key in asymmetric cryptography?
You will always need access to the secret key when encrypting messages; when using an asymmetric cipher only the public key is required. So the chance of leaking the secret key can be made smaller when using asymmetric cryptography.