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In computing, data deduplication is a technique for eliminating duplicate copies of repeating data. Successful implementation of the technique can improve storage utilization, which may in turn lower capital expenditure by reducing the overall amount of storage media required to meet storage capacity needs.
The Worst Passwords List is an annual list of the 25 most common passwords from each year as produced by internet security firm SplashData. [3] Since 2011, the firm has published the list based on data examined from millions of passwords leaked in data breaches, mostly in North America and Western Europe, over each year.
When used in cryptography, commonly the passphrase protects a long machine generated key, and the key protects the data. The key is so long a brute force attack directly on the data is impossible. A key derivation function is used, involving many thousands of iterations (salted & hashed), to slow down password cracking attacks.