Manual:$wgHKDFSecret

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<translate> Security</translate>: $wgHKDFSecret
Secret for HMAC-based key derivation function (fast, cryptographically secure random numbers).
<translate> Introduced in version:</translate>	1.24.0 (Gerrit change 137077; git #af66c04d)
<translate> Removed in version:</translate>	<translate> still in use</translate>
<translate> Allowed values:</translate>	(string) or `false`
<translate> Default value:</translate>	`false`
<translate> Other settings:</translate> <translate> Alphabetical</translate> \| <translate> By function</translate>

Details

If the value is a string, it is used as the secret for the HMAC-based key derivation function, else, if it is evaluated as false, $wgSecretKey is used for this function.