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Biometric Methods

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ΠΑΝΕΠΙΣΤΗΜΙΟ ΑΙΓΑΙΟΥ ΤΜΗΜΑ ΜΗΧΑΝΙΚΩΝ & ΕΠΙΚΟΙΝΩΝΙΑΚΩΝ ΣΥΣΤΗΜΑΤΩΝ ΚΑΤΕΥΘΥΝΣΗ: ΨΗΦΙΑΚΗ ΚΑΙΝΟΤΟΜΙΑ & ΕΠΙΧΕΙΡΗΜΑΤΙΚΟΤΗΤΑ ΜΑΘΗΜΑ: ΑΣΦΑΛΕΙΑ ΠΛΗΡΟΦΟΡΙΑΚΩΝ ΣΥΣΤΗΜΑΤΩΝ & ΤΕΧΝΟΛΟΓΙΕΣ ΕΝΙΣΧΥΣΗΣ ΤΗΣ ΙΔΙΩΤΙΚΟΤΗΤΑΣ ΘΕΜΑ: ΒΙΟΜΕΤΡΙΚΕΣ ΜΕΘΟΔΟΙ ΑΥΘΕΝΤΙΚΟΠΟΙΗΣΗΣ

ΟΝΟΜΑ:ΡΟΥΒΑ ΣΤΑΥΡΟΥΛΑ Α.Μ: 323Μ/2014093

ΑΘΗΝΑ 2014

Βιομετρικές Μέθοδοι- ένας σύντομος ορισμός Οι βιομετρικές μέθοδοι αναγνώρισης μπορούν να οριστούν ως οι αυτοματοποιημένες μέθοδοι που έχουν σαν στόχο την αναγνώριση ή αυθεντικοποίηση της ταυτότητας ενός ανθρώπου με βάση τους τα φυσιολογικά χαρακτηριστικά ή τις συνήθεις συμπεριφορές του. Ένας πιο λεπτομερής ορισμός τον οποίο μπορούμε να χρησιμοποιήσουμε είναι πως «οι βιομετρικές μέθοδοι αναγνώρισης αποτελούν κάθε αυτόματα μετρήσιμο, χρονικά σταθερό και ευδιάκριτο φυσιολογικό χαρακτηριστικό ή προσωπικό στοιχείο, που μπορεί να χρησιμοποιηθεί για την αναγνώριση ή την επιβεβαίωση της ταυτότητας ενός προσώπου»1. Εν συνεχεία, θα κάνουμε μια περαιτέρω προσπάθεια να να αποσαφηνίσουμε τους παραπάνω ορισμούς με στόχο την καλύτερη κατανόηση τους. Αναγνώριση και αυθεντικοποίηση Σε αυτό το σημείο είναι σημαντικό να αναφέρουμε πως οι έννοιες αναγνώριση και αυθεντικοποίηση αποτελούν δύο ξεχωριστές διαδικασίες στην ασφάλεια ενός πληροφοριακού συστήματος όπως θα δούμε και από τους ορισμούς παρακάτω.  «Αναγνώριση ονομάζεται η διαδικασία αναζήτησης της ταυτότητας ενός χρήστη μέσα στο πλήθος των καταγεγραμμένων χρηστών. Κατά τη διαδικασία της αναγνώρισης το σύστημα προσπαθεί να εντοπίσει ένα συγκεκριμένο χρήστη συγκρίνοντας τα στοιχεία του με τα αποθηκευμένα στοιχεία όλων των χρηστών. Λέγεται και ‘ένα προς πολλά’ αναζήτηση (1:N) και ουσιαστικά επιχειρεί να απαντήσει στο ερώτημα «Ποιος είναι ο Χ; »2.  «Αυθεντικοποίηση ονομάζεται η διαδικασία επιβεβαίωσης της ταυτότητας ενός χρήστη. Το σύστημα ουσιαστικά επιχειρεί να απαντήσει στην ερώτηση «Είναι ο Χ; » συγκρίνοντας τα χαρακτηριστικά του συγκεκριμένου χρήστη μόνο με τα αποθηκευμένα στοιχεία του προσώπου την ταυτότητα του οποίου διεκδικεί. Λέγεται και ‘ένα προς ένα’ αναζήτηση (1:1) και είναι προφανώς πιο γρήγορη μέθοδος από την αναγνώριση3.» Ωστόσο μπορούμε να αναγνωρίσουμε ότι τόσο η αναγνώριση όσο και η αυθεντικοποίηση μπορούν να προσδιοριστούν με μια ή και περισσότερες από τις παρακάτω τεχνικές: 1. Τεχνικές σύμφωνα με κάτι που γνωρίζει ο χρήστης (π.χ. συνθηματικά, κωδικοί κλπ.) 2. Τεχνικές σύμφωνα με κάτι που έχει στην κατοχή του χρήστης (π.χ. μαγνητικές κάρτες κλπ.) 3. Τεχνικές που έχουν στηριχθεί στα βιομετρικά χαρακτηριστικά του χρήστη, οι οποίες έχουν και το πλεονέκτημα ότι δεν μπορούν να κλαπούν ή να χαθούν καθώς αποτελούν μοναδικά
1 2 3 Σιάτρας, Σ., (2004), Σύστημα Αυθεντικοποίησης Μέσω Αναγνώρισης Τρόπου Πληκτρολόγησης, ΑΠΘ. Σιάτρας, Σ., (2004), Σύστημα Αυθεντικοποίησης Μέσω Αναγνώρισης Τρόπου Πληκτρολόγησης, ΑΠΘ. Σιάτρας, Σ., (2004), Σύστημα Αυθεντικοποίησης Μέσω Αναγνώρισης Τρόπου Πληκτρολόγησης, ΑΠΘ.

χαρακτηριστικά. Βιομετρικά Χαρακτηριστικά Οι παράμετροι που πρέπει να ικανοποιεί ένα ανθρώπινο χαρακτηριστικό είτε είναι ανατομικό είτε είναι συμπεριφοράς για να μπορέσει να χρησιμοποιηθεί ως βιομετρικό χαρακτηριστικό είναι οι εξής: 1. Καθολικότητα: πρέπει να το διαθέτει κάθε άτομο. 2. Μοναδικότητα: να είναι διαφορετικό για οποιοδήποτε άτομο. 3. Μονιμότητα: να μην είναι μεταβλητό με το πέρασμα του χρόνου. 4. Μετρησιμότητα: να μπορεί να μετρηθεί με κάποια μέθοδο. Τα βιομετρικά χαρακτηριστικά που χρησιμοποιούνται ως επί το πλείστον είναι: 1. Η ίριδα του ματιού 2. Το πρόσωπο 3. Τα δακτυλικά αποτυπώματα 4. Οι φλέβες του χεριού 5. Η φωνή 6. Η υπογραφή και ο γραφικός χαρακτήρας Στον παρακάτω πίνακα θα μελετήσουμε τις παραμέτρους των βιομετρικών χαρακτηριστικών:

Σύγκριση των βιομετρικών χαρακτηριστικών. Βαθμολογία: Χ (χαμηλό), Μ (μεσαίο), Υ (υψηλό).

Παρατηρώντας τον πίνακα, βλέπουμε ότι το δακτυλικό αποτύπωμα μπορεί να θεωρηθεί επαρκές σε όλες τις παραμέτρους, ενώ παράλληλα παρουσιάζει υψηλότερη βαθμολογία σε αντίθεση με τα υπόλοιπα χαρακτηριστικά , τα οποία παρουσιάζουν χαμηλή βαθμολογία σε κάποια κριτήρια. Αυτός άλλωστε είναι και ο λόγος που το συγκεκριμένο βιομετρικό χαρακτηριστικό

χρησιμοποιείται συχνότερα για το διαχωρισμό και την ταυτοποίηση ατόμων. Σε αυτό το σημείο πρέπει να σημειώσουμε ότι δεν υπάρχει τέλειο βιομετρικό. Η επιλογή του εξαρτάται τόσο από την εφαρμογή που θέλουμε να το εγκαταστήσουμε, το επίπεδο ασφάλειας του οργανισμού ή της επιχείρησης, το κόστος και τη φιλικότητα προς τον χρήστη. Ορισμένα είναι αποδοτικότερα για μια εφαρμογή από κάποια άλλα. Π.χ. Αν θέλουμε η εφαρμογή μας να αναγνωρίζει από απόσταση τότε προσφέρεται το βάδισμα ως βιομετρικό χαρακτηριστικό. Περίπτωση Μελέτης: Πιστωτική κάρτα με ενσωματωμένο αισθητήρα δακτυλικού αποτυπώματος Λαμβάνοντας υπόψη μας τα παραπάνω θα εξετάσουμε περαιτέρω την είδηση που κυκλοφόρησε προ ημερών η MasterCard, η οποία ανακοίνωσε πως θα κυκλοφορήσει τη πρώτη πιστωτική κάρτα με ενσωματωμένο αισθητήρα δακτυλικού αποτυπώματος. Σε αυτό το σημείο είναι σημαντικό να εμβαθύνουμε στην επιλογή των δακτυλικών αποτυπωμάτων ως βιομετρική μέθοδο αυθεντικοποίησης. Δακτυλικά αποτυπώματα Tα δακτυλικά αποτυπώματα αποτελούν ουσιαστικά τις γραμμώσεις των δακτύλων του χεριού τα οποία έχουν τη δυνατότητα να χρησιμοποιηθούν για το μοναδικό προσδιορισμό των ανθρώπων. Η διαδικασία με την οποία αναγνωρίζουμε το δακτυλικό αποτύπωμα ως βιομετρικό στοιχείο είναι ουσιαστικά μία αυτοματοποιημένη, ψηφιακή εκδοχή της παραδοσιακής μεθόδου καταγραφής του δακτυλικού αποτυπώματος με μελάνι, που χρησιμοποιείται από τον προπερασμένο αιώνα. Για να μπορέσουμε να καταγράψουμε το σχέδιο του δακτυλικού αποτυπώματος χρησιμοποιούμε ένα ειδικό αισθητήριο ενώ παράλληλα αποτελεί εύκολη διαδικασία για τον χρήστη. Όπως μπορεί να γίνει φανερό, η ψηφιακή καταγραφή των δακτυλικών αποτυπωμάτων έχει σχεδόν απαλείψει τη χρήση της καταγραφής των αποτυπωμάτων με τον παραδοσιακό τρόπο. Τρόπος λειτουργίας Η λειτουργία της θα είναι σχετικά απλοϊκή. Κατά την πληρωμή, ο κάτοχος της κάρτας το μόνο που έχει να κάνει είναι απλώς να τοποθετήσει τον αντίχειρά του στον βιομετρικό αισθητήρα. Αν το δακτυλικό αποτύπωμα δεν έχει αποθηκευτεί στην κάρτα τότε η πληρωμή δεν είναι δυνατόν να ολοκληρωθεί. Όσον αφορά στην παροχή ενέργειας και τη φόρτιση της, και για να είναι συνέχεια διαθέσιμη στη τσέπη του ιδιοκτήτη, η κάρτα θα φορτίζεται κάθε φορά που χρησιμοποιείται σε

τερματικό πληρωμής αντλώντας ενέργεια από εκεί4. Πλεονεκτήματα μεθόδου δακτυλικών αποτυπωμάτων 1. Παρέχει πολύ υψηλή ακρίβεια και αξιοπιστία. 2. Είναι η πιο οικονομική βιομετρική τεχνική ελέγχου ταυτότητας χρήστη. 3. Είναι μία από τις πιο ανεπτυγμένες βιομετρικές μεθόδους μιας και χρησιμοποιείται εδώ και δεκαετίες. 4. Είναι εύκολη στη χρήση. 5. Απαιτεί μικρό χώρο αποθήκευσης που χρειάζεται η βιομετρική φόρμα, μειώνοντας το μέγεθος της μνήμης της βάσης δεδομένων. 6. Είναι τυποποιημένη. Μειονεκτήματα μεθόδου δακτυλικών αποτυπωμάτων 1. Δεν είναι ακόμα κοινωνικά αποδεκτό σε πολλές περιπτώσεις και αυτό γιατί ένας μεγάλος αριθμός ανθρώπων τη θεωρεί παρεμβατική, διότι εξακολουθεί να είναι σχετική με την ποινική ταυτοποίηση. 2. Ευκολία στην πλαστογράφηση ανάλογα με το σύστημα ελέγχου πρόσβασης που χρησιμοποιείται.. Τα δακτυλικά αποτυπώματα είναι κάτι που ο καθένας αφήνει πίσω του, και μπορούν να αντιγραφούν από τους παραχαράκτες, χρησιμοποιώντας απλά οικιακά αντικείμενα, όπως κολλητική ταινία. 3. Ευαισθησία στις περιβαλλοντικές συνθήκες. Τα λερωμένα χέρια, χειρουργικά γάντια, και οι ατμοσφαιρικοί ρύποι αποτελούν παραδείγματα των προκλήσεων που αντιμετωπίζονται στο χώρο εργασίας.

4 http://insidenews.gr/, (2014), Η MasterCard θα κυκλοφορήσει πιστωτική κάρτα με ενσωματωμένο αισθητήρα. δακτυλικού αποτυπώματος.

Βιβλιογραφία 1. Σιάτρας, Σ., (2004), Σύστημα Αυθεντικοποίησης Μέσω Αναγνώρισης Τρόπου

Πληκτρολόγησης, ΑΠΘ. 2. Olzak, T., (2012), Application of Biometrics: http://resources.infosecinstitute.com/chapter12-applications-of-biometrics/. 3. http://www.biometricsinstitute.org/. 4. Technovelgy, Biometric Security Overview: http://www.technovelgy.com/ct/TechnologyArticle.asp?ArtNum=10.

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