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One Time Password

One Time Password. Onno W. Purbo Onno@indo.net.id. Referensi. Buku “Keamanan Jaringan Internet”, Elexmedia Komputindo. Login Normal. Red Hat Linux release 6.0 (Hedwig) Kernel 2.2.5-15 on an i486 tony login:. Problem. Password & userid plan text Rentan sniffer Solusi

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One Time Password

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  1. One Time Password Onno W. Purbo Onno@indo.net.id

  2. Referensi • Buku “Keamanan Jaringan Internet”, Elexmedia Komputindo

  3. Login Normal Red Hat Linux release 6.0 (Hedwig) Kernel 2.2.5-15 on an i486 tony login:

  4. Problem • Password & userid plan text • Rentan sniffer Solusi • Password hanya digunakan satu kali • Password berubah setiap kali

  5. Penemu .. • Ide • Leslie Lamport • Software OTP – S/KEY 1991 • Phil Karn, KA9Q – Bellcore • Neil Haler • John Walden

  6. Challenge Red Hat Linux release 6.0 (Hedwig) Kernel 2.2.5-15 on an 1486 tony login: Challenge:994 672jar Password:

  7. Challenge dari Server • Iterasi • Seed

  8. Kalkulator Pada Client • Seed • Iterasi • Frasa rahasia client

  9. Kalkulator pada Klien

  10. Responds .. • Tiap client / user akan memberikan kalkulasi responds yang beda karena frasa rahasianya berbeda.

  11. Red Hat Linux release 6.0 (Hedwig) Kernel 2.2.5-15 on an i486 tony login: tony Challenge:994 672jar Password: Login incorrect login: tony Challenge:983 672jar Password: (turning echo on) Password:was leo cal amy tire of Last login:Sun Nov 21 23:03:19 from tony [tony @ tony tony]$

  12. Instalasi OTP • Mendapatkan installer OTP untuk sistem • Mendapatkan kalkulator untuk client • Mengkompile dan melakukan instalasi komponen-komponen OTP • Melakukan inisialisasi user dengan kunci masing-masing • Meng-enable OTP

  13. Inisialisasi OTP tony.cisitu.net > keyinit Adding wanda: Reminder you need the 6 english words from the skey command Enter sequence count from 1 to 9999: 1000 Enter new key [default nd12043]: heather S/key 1000 heather S/key access password: ORB HURD LENT CRAM MELD HOSE ID wanda s/key is 1000 heather ORB HURD LENT CRAM MELD HOSE

  14. X Windows tony.cisitu.net login:tony Callenge:974 672jar Password:

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