Final answer:
RC4 supports key sizes ranging from 1 to 2048 bits, with a default key size of 128 bits. Choosing a larger key size enhances the security of encrypted data. However, RC4 is now considered outdated and insecure.
Step-by-step explanation:
The RC4 algorithm supports key sizes ranging from 1 to 2048 bits, with a default key size of 128 bits. The key size determines the complexity and strength of encryption provided by RC4. A larger key size generally enhances the security of encrypted data, making it harder for attackers to crack the encryption.
For example, if you choose a key size of 128 bits, the RC4 algorithm will generate a unique key using those 128 bits. This key is then used to encrypt and decrypt the data. It is important to select a key size that balances security requirements with performance considerations.
It's worth noting that RC4 is now considered outdated and insecure due to multiple vulnerabilities discovered over the years. It is recommended to use more modern encryption algorithms, such as AES (Advanced Encryption Standard), which provides stronger security.