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I need a captcha that will output a random string of letters as an image, with distortion as in most captchas today, using GD
The letters used will be UTF-8 Greek: consonants 'β','γ','δ','ζ','θ','κ','λ','μ','ν','ξ','π','ρ','τ','φ','χ','ψ' and vowels 'α','ε','η','ι','ο','υ','ω', which have to interchange 1-1
The image behind the text has to be randomly selected by images in a folder
Sessions must be implemented and the captcha output has to have the form of $_SESSION['security_code']
Settings shall include image size, distortion level, string length, text colors randomization