MK : KEAMANAN SISTEM KOMPUTER
Perkuliahan 13 (24-27 November 2020)
Semester 3 - 2020/2021
S1 TEKNIK INFORMATIKA
KEAMANAN SISTE INFORMATIKA - C31040319
Dosen : Desi Rose Hertina, ST, M.Kom
Nama : Nelly Yulia
NIM : 201931100
Daerah Asal : JAKARTA, DKI JAKARTA
Lokasi Terkini : Jl Budi Mulia Raya, Jakarta Utara
Halo teman-teman..
Kembali lagi nih ke blog saya.
Gimana kabar kalian semua ? semoga baik-baik saja ya.
Ohhiya jangan lupa untuk tetap menjaga kesehatan dan kebersihan kalian ya.
Supaya terhindar dari virus-virus. Oke? oke dong ya.
Kali ini kita akan membahas "KRIPTOGRAFI VIGNERE CIPHER"
Apasih "KRIPTOGRAFI VIGNERE CIPHER" itu ?
KRIPTOGRAFI VIGNERE CIPHER itu adalah polyalphabetic substitution cipher yang paling sederhana dan paling banyak dikenal. Sandi Vigenere sebenarnya merupakan pengembangan dari sandi Caesar. Pada sandi Caesar, setiap huruf teks terang digantikan dengan huruf lain yang memiliki perbedaan tertentu pada urutan alfabet. Kelebihan sandi ini dibanding sandi Caesar dan sandi monoalfabetik lainnya adalah sandi ini tidak begitu rentan terhadap metode pemecahan sandi yang disebut analisis frekuensi. Berikut ini adalah tabel acuan untuk Algoritma Kriptografi Vignere Cipher dalam bentuk matrik sebanyak 26 baris x 26 kolom :
Tabel Acuan
P E S A N |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
B |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
C |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
D |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
E |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
F |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
G |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
H |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
I |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
J |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
K |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
L |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
M |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
N |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
O |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
P |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
Q |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
R |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
S |
S |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
T |
T |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
U |
U |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
V |
V |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
W |
W |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
X |
X |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
Y |
Y |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Z |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Contoh Algoritma Kriptografi Vignere Cipher diketahui data sebagai berikut :
Pesan : SUMPAH PEMUDA
Kunci : KEJUJURAN
Syarat Algoritma Kriptografi Vignere Cipher yaitu :
1. JUMLAH ALFABET KUNCI MENGIKUTI JUMLAH ALFABET PESAN,
2. Pesan disimpan pada BARIS pada tabel acuan,
3. Kunci disimpan pada KOLOM pada tabel acuan.
Pesan (Baris) |
S |
U |
M |
P |
A |
H |
P |
E |
M |
U |
D |
A |
Kunci (Kolom) |
K |
E |
J |
U |
J |
U |
R |
A |
N |
K |
E |
J |
Enkripsi (Baris, Kolom) |
(S,K) = C |
(U,E) = Y |
(M,J) = V |
(P,U) = J |
(A,J) = J |
(H,U) = B |
(P,R) = G |
(E,A) = E |
(M,N) = Z |
(U,K) = E |
(D,E) = H |
(A,J) = J |
Enkripsi Tahapan |
Tempatkan HURUF PESAN pada ruang BARIS, kemudian cari HURUF KUNCI pada ruang KOLOM, sehingga titik temu (ISI) antara BARIS dan KOLOM dari setiap huruf adalah cipher text |
|||||||||||
Cipher text |
CYVJJB GEZEHJ |
|||||||||||
Deskripsi (Cipher, Kunci) |
S |
U |
M |
P |
A |
H |
P |
E |
M |
U |
D |
A |
Deskripsi Tahapan |
Berdasarkan HURUF cipher text yang berada di titik ISI table acuan carilah HURUF KUNCI pada bagian KOLOM sejajar, sehingga HURUF PESAN dapat ditemukan pada bagian BARIS sejajar. |
|||||||||||
Plaintext |
SUMPAH PEMUDA |
Seperti itulah cara mengerjakan "KRIPTOGRAFI VIGNERE CIPHER". Semoga teman-teman dapat memahami dan mengerti pembahasan kali ini. cukup sekian dan terima kasih ya. byeeee..
Link Kelas B :
1. 201831013-AGIL BINTORO SANDY https://agilbsandy.wordpress.com
2. 201831024-HUSNUZAN HIDAYAT PRATAMA ABBAS https://tamamasbro.wixsite.com/home
3. 20183103-ALASAN FOWORENZES SINAGA https://alasanfsinaga.blogspot.com/2020/09/alasan-f-sinaga-201831034-keamanan.html
4. 201831043-DHANI OKTAVIAN ELFARABY https://dhanioktavianelfaraby.blogspot.com
5. 201831054-SULKIFLI https://zlkfli07.blogspot.com/?m=1
6. 201831055-ANNISA NURUL FAHIRA https://keamanansistemkomputerfahira.blogspot.com/2020/09/keamanan-sistem-komputer.html
7. 201831064-ARDIANSYAH
8. 201831065-ARIO NUGROHO https://arionugroho112233.blogspot.com/?m=1
9. 201831075-BRIGITA TIORA https://sobatksk.blogspot.com
10. 201831086-DENNY WAHYU PRIYAMBODO https://ksktugas.blogspot.com/2020/11/keamanan-sistem-komputer-perkuliahan-ke.html
11. 201831091-MELANTHON JOSSE SIRAIT https://melanthonsirait.blogspot.com/2020/09/keamanan-sistem-komputer-perkuliahan-2.html
12. 201831095-MUHAMMAD FEBRIANSYAH
13 201831116-ZAHIER MUHAMMAD PELU https://zahierp-itpln.blogspot.com/
14. 201831117-SANDY.T.LAITUPA https://sandylaitupa2.blogspot.com/2020/09/ksk_23.html?m=1
15. 201831127-ALAN AKBAR https://alanakbar22.blogspot.com/
16. 201831148-LAILIL AYU FITRIYAH https://lailil148.blogspot.com/?m=1
17. 201831152-CHARLIE RAJA SAMUEL SIAHAAN https://charliestory26.blogspot.com/
18. 201931018-ATHALLA NAUFAL JAFAR https://athallanaufaljafarksk.blogspot.com/2020/11/keamanan-sistem-komputer_10.html
19. 201931026-M.FIRDAUS https://firdausmhd264.blogspot.com
20. 201931038-ANGELIA AYUYOLANDA S https://keamanansistemkompas.blogspot.com/
21. 201931039-MUHAMMAD FAISAL https://jalanbaruuntuk90.blogspot.com/?m=1
22. 201931048-ACHMAD DWI NUSANTORO https://19048ksk.blogspot.com/?m=1
23. 201931064-CINDY ORELLA ASARYA SILALAHI https://asaryaslh.blogspot.com
24. 201931066-NUR ISMI NADIAH https://nurisminadiahh.blogspot.com/?m=1
25. 201931072-RICKY MARNAEK SIBARANI https://rickymarneksibarani.blogspot.com/
26. 201931074-MELANI YUNISA BAITANG https://melaniyunisa.blogspot.com/?m=1
27. 201931085-YUSRIL NAUVALLY RISKY https://yusrilksk.blogspot.com/
28. 201931096-ANDI BATARI SALMIN https://abatarisalmin.blogspot.com/?m=1
29. 201931100-NELLY YULIA https://keamanansistemkomputerr.blogspot.com/ ← Link saat ini
30. 201931111-FIRYAL FAHIRA S. AGAM https://ksk-b111.blogspot.com/?m=1
31. 201931121- ANGELA PRASETYO angelaprasetyo00.blogspot.com
32. 201931142-FIRDAUS YOGA ANGGORO https://tugasblogidentitas.blogspot.com/
33. 201931156-MUHAMMAD BHAHRY HAKIKI (bhahryksk.blogspot.com)
34. 201931157 ABDUL HADI SADIK http://hadisadik0227.blogspot.com/2020/09/pertemuan-2.html?m=1
35. 201931167-DWI SAMSIARTO doeysam.blogspot.com/2020/09/1_22.html
36. 201931169-YOHANES TRI SUGIARTO https://tugasyohanes.blogspot.com/?m=1
37. 201931171-MUHAMMAD ALDI IRFAN https://201931171aldi.blogspot.com/
38. 201931173- MUHAMMAD AGUM BRILIANTO https://201931173agum.blogspot.com/
39. 201931175-MUHAMMAD MA'RUF https://marufksk1.blogspot.com/
40. 201931272-LILIES CAHYANTI http://berbagiilmu-informatika.blogspot.com
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