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Learn how password strength is measured by entropy, which is the minimum number of bits needed to hold the information in a password. Find out how password guessing and cracking work, and how to improve password security with salts and key stretching.
Learn how to generate strong and secure passwords using software, hardware, or manual methods. Compare different sources of randomness, password types, and entropy calculations.
Salt is random data added to a password or passphrase before hashing it, to prevent attacks using precomputed tables or multiple occurrences of the same password. Learn how salt works, its benefits, common mistakes and examples.
A cryptographic nonce is an arbitrary number used only once in a cryptographic communication to prevent replay attacks. Learn how nonces are used in authentication, initialization vectors, hashing and proof-of-work systems.
A cryptographic hash function is a hash algorithm that has special properties for cryptographic applications, such as pre-image resistance, second pre-image resistance, and collision resistance. Learn about the concepts, security levels, and applications of cryptographic hash functions, and how they differ from non-cryptographic hash functions.
Diceware is a method for creating passphrases, passwords, and other cryptographic variables using ordinary dice as a hardware random number generator. It involves rolling five dice and looking up the numbers in a word list to form a word, which can be repeated to form a longer passphrase.
If your password is on this list of the 10,000 most common passwords, you need a new password. A hacker can use or generate files like this, which may be readily compiled from breaches of sites such as Ashley Madison .
A passphrase is a sequence of words or other text used to control access to a computer system, program or data. Learn how passphrases differ from passwords, how to choose and use them securely, and see some examples of passphrases.
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