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Possible Errata , or improvement. + a question

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Chapter 7 page 240.  The salt nacl is saved like VARBINARY(64)  but its dimension is always 64 byte thereby could be better BINARY(64).

Furthermore    nacl=UNHEX(SHA2(RAND(),512)  uses RAND() that has low entropy, you could use RANDOM_BYTES(len)    with len>16 namely


Furthermore I didn't undestand one thing:

RAND() return a FLOAT and SHA2() function need as first parameter a String thus how does it work? Is there in MySQL an automatic conversion from float to String?


Best regards


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