New-RandomPassword

New-RandomPassword.ps1

function New-RandomPassword {
    $charset = ([char]'a'..[char]'z').foreach({[char]$_})
    $RawPassword = ''
    
    for ($i = 0; $i -lt 14; $i++)
    {
        # First and last 4 are letters
        if ($i -lt 4 -or $i -gt 9)
        {
            if ($i % 2 -eq 0)
                { $set = $charset -match '[^aeiou]' }
            else
                { $set = $charset -match '[aeiou]' }
        }
        else
            { $set = 0..9 }
        
        $RawPassword += [string](Get-Random $set)
        if ($i -eq 0)
            { $RawPassword = $RawPassword.ToUpper() }
    }
    
    $SecureString = ConvertTo-SecureString -AsPlainText $RawPassword -Force
    
    [PSCustomObject]@{
        'RawPassword'  = $RawPassword
        'SecureString' = $SecureString
    }
}