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Answer :
It is inappropriate to use a hash algorithm for Telnet logins because Telnet transfers data in plaintext, which cannot be protected by hashing. Hash algorithms are ideal for verifying file integrity, SSH logins, and digital signature verification, but not for unencrypted protocols such as Telnet. So the correct option is (A) Telnet logins.
The context in which it is inappropriate to use a hash algorithm is Telnet logins. Hash algorithms are commonly utilized to verify file integrity, facilitate Secure Shell (SSH) logins through public-key cryptography, and verify digital signatures due to their ability to ensure data integrity and provide verification methods.
However, Telnet is an older protocol that transmits data in plaintext, including passwords, making it insecure by modern standards. A hash algorithm would not be effective in this context because it cannot protect the data from being intercepted during transmission. Instead, SSH, which uses encrypted channels, should be used for secure remote logins.
When it comes to password hashing algorithms like LM, NTLM, MD5, and SHA-1, the main objective is to safeguard credentials by storing the password in a hashed form, which is difficult to reverse. Nonetheless, vulnerabilities such as those found in MD5 hashes necessitate the need for more secure algorithms to enhance protection against unauthorized access.
Verifying the integrity of software, safeguarding against unauthorized data alteration, and authenticating communications are essential uses of cryptographic hash functions. They are a cornerstone of modern cybersecurity practices. Hash functions compress data into a fixed-size string that acts as a fingerprint of the input data. This characteristic is critical in contexts such as digital signing, where a cryptographic hash of a message is signed instead of the entire message for efficiency reasons. So the correct option is (A) Telnet logins.
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