Supported Encryption Algorithms for SSH Protocol
Question
SSH is a network protocol that allows data to be exchanged between two networks using a secure channel.
Which of the following encryption algorithms can be used by the SSH protocol? Each correct answer represents a complete solution.
Choose all that apply.
Answers
Explanations
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A. B. C. D.CBA.
SSH (Secure Shell) is a network protocol that enables secure communication between two networked devices. It provides confidentiality and integrity of data exchanged between the devices by encrypting the data using various encryption algorithms.
SSH can use multiple encryption algorithms to encrypt the data exchanged between the devices. The following are some of the encryption algorithms that can be used by the SSH protocol:
A. Blowfish: Blowfish is a symmetric encryption algorithm that uses a variable-length key, ranging from 32 bits to 448 bits. It is fast and secure, making it an ideal choice for SSH encryption. However, it has been criticized for being susceptible to some types of attacks.
B. DES (Data Encryption Standard): DES is a symmetric encryption algorithm that uses a fixed-length key of 56 bits. It is no longer considered secure because of its short key length, making it vulnerable to brute-force attacks.
C. IDEA (International Data Encryption Algorithm): IDEA is a symmetric encryption algorithm that uses a fixed-length key of 128 bits. It is a secure algorithm, but it is not commonly used in SSH because it is slower than other algorithms.
D. RC4: RC4 is a symmetric encryption algorithm that uses a variable-length key ranging from 40 bits to 2048 bits. It is fast and widely used, but it has some known vulnerabilities that make it less secure than other algorithms.
In conclusion, the encryption algorithms that can be used by the SSH protocol include Blowfish and RC4. Therefore, options A and D are the correct answers. DES and IDEA are not commonly used in SSH encryption.
