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Dalam seni kriptografi klasik, sandi BIFID (BIFID CIPHER) adalah sandi/cipher yang diciptakan sekitar tahun 1901 oleh Felix Delastelle, awalnya dia hanya membuat sandi dalam 1 kotak (bifid cipher), lalu diapun sempat membuat 1 penerapan lagi dengan membentuk perluasan pembagian 3 kotak (trifid) utk memperkecil kemungkinan pesan dalam sandi itu mudah dipecahkan saat mengirim pesan dimana pada sandi BIFID menggunakan 1 buah kotak 5x5, sedangkan pada TRIFID menggunakan 3 buah kotak 3x3
__1_2_3_4_5
1_A_B_C_D_E
2_F_G_H_I/J_K
3_L_M_N_O_P
4_Q_R_S_T_U
5_V_W_X_Y_Z
huruf I dan J dalam beberapa kasus memang bisa digabungkan selain itu pemakaian huruf J dalam bahasa inggris Juga terlampau jarang, oleh sebab itulah dalam beberapa sandi terutama sandi yang menggunakan polybius square (kotak 5x5 huruf I pasti
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