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3

Per https://www.php.net/manual/en/function.str-shuffle.php, str_shuffle uses PHP's internal PRNG, which is an implementation of Mersenne Twister (see http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html or https://en.wikipedia.org/wiki/Mersenne_Twister). According to Wikipedia, the standard Mersenne Twister implementation requires observing 624 ...


1

Guessing a valid credit card number is feasible. Choose a known BIN (first six), generate 9 random digits, and then append the appropriate checkdigit. That's only 1,000,000,000 combinations - high, but listing every single one is certainly doable even on a personal computer. Checking whether your guess is actually valid is harder. Almost every single ...


2

The answer depends on the way your are going to manipulate your passphrase, because some transformations will lower the entropy, while others will not. For example, are you changing the order of the words? Are you turning some verbs into adverbs, or nouns into adjectives, etc. to produce a better sentence? Then the resulting entropy is likely to be lower. Or ...


3

Intro Given that you're using a diceware list, I'll follow the one found here but this applies to any list (except for the average word size and some details in the instructions). Properties of the diceware list The instructions for using the diceware list make it clear that the overarching goal is to avoid bias when constructing a passphrase, starting from ...


-1

You can determine the level of security you have with Veracrypt (or any other encryption software) within a Virtual Machine, by using logical deduction, and considering (realistically) what hypervisor data files are modified by the Hypervisor when data is accessed and/or written to and from, when a storage device within a Hypervisor guest is modified. ...


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