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Do the Special Characters in SHA512 Improve Entropy?

Reblogging my greatest hits so you don’t have to.

Do the Special Characters in SHA512 Improve Entropy?

Entropy, in the context of passwords, refers to the measure of randomness or unpredictability in the password, which directly influences its security. Higher entropy means a password is less predictable and therefore harder for attackers to guess through brute-force methods (trying all possible combinations) or using common attack strategies like dictionary attacks.

Entropy Factors:

1. Length: Longer passwords generally have higher entropy.
2. Complexity: Using a mix of uppercase and lowercase letters, numbers, and special characters increases entropy.
3. Unpredictability: Randomly generated passwords are more secure than predictable ones, like common phrases or sequential characters.

A high-entropy password is more resistant to attacks because it requires more attempts to guess. For instance, a password like “P@ssw0rd!” is less secure (lower entropy) than “7g!2B$vKp3X” because the latter is longer, more complex, and less predictable.

Password Hashing: Password hashing is a fundamental security practice used to protect passwords stored in databases. When you create a password on a website, instead of storing your password as plain text, the system converts it into a hash using a hashing algorithm. This hash is a fixed-size string of characters that uniquely represents your password.

Key features of hashing include:

• Irreversibility: It’s computationally infeasible to reverse a hash back to the original password.
• Uniqueness: Even a small change in the password creates a completely different hash.
• Consistency: The same password will always result in the same hash with the same hashing algorithm.
• Security: In the event of a data breach, attackers can’t easily retrieve user passwords from the hashed values.

However, hashing alone is not foolproof. Techniques like using a ‘salt’ (a random value added to a password before hashing) and choosing strong hashing algorithms enhance security. Salting ensures that even identical passwords will have different hashes, thwarting attempts to use pre-computed tables (like rainbow tables) for cracking hashes.

In summary, high entropy in passwords makes them more secure against guessing or brute-force attacks. Password hashing, especially when combined with salting, further protects password data stored in databases, ensuring that even if data is compromised, the passwords are not easily recoverable.

ANSWER here.

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