These are used to ensure that the received message text is intact and unmodified. HMAC uses Hash values to generate HMAC codes. The main use of Hash values in SSH is with HMAC (Hashed Message Authentication Code). In SSH, Hash values are mainly used for checking data integrity (data is not modified accidently or intentionally), and to verify the authenticity of communication. ![]() The output string of a Hashing algorithm is generally called as a Hash value. Modifying even a single bit of the data will result in generating an entirely different Hash value, next time when you run the same Hashing algorithm on that data again. Hashing algorithms generate a unique Hash string as output, taking a chunk of data as the input. Hashing algorithms are used to generate Hash values from a chunk of data. ![]() ![]() The purpose of Hashing algorithms, MAC (Message Authentication Code) and HMAC (Hashed Message Authentication Code) in SSH is for validating whether the received packets are from the real original sender and the data packets are not tampered/corrupted during network transit.
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