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Encrypt
Decrypt
Binary
Modular Arithmetic
Extended Euclidean
100

Encrypt this message using multiplicative key of 5:

trenches

Answer: rhunkjum

100

Decrypt this message that used multiplicative key of 11:

gsbwzmj

Answer: Ketchup

100

Convert from Binary to Decimal: 

10101001101

Answer: 1357

100

240 + 325  = ______ (mod 11)


Answer: 4

100

Find a linear combination such that

7x+4y = GCD(7,4)

7x+4y = 1

x=-1

y=2

200

Encrypt this message using multiplicative key of 23:

garden snake

Answer: iabronynawo

200

Decrypt this message that used multiplicative key of 21:

anjmlijg

Answer: antidote

200

Convert from Binary to Decimal: 

111111111011

Answer: 4091

200

54 - 356  = ______ (mod 21)

Answer: 13

200

Find a linear combination such that

21x+26y = GCD(26,21)

21x+26y = 1

x=5

y=-4

300

Encrypt this message using affine key of (7,14):

enigma machine

Answer: qbseuo uoclsbq

300

Decrypt this message that used affine key of (15,22):

ylfmzmyj

Answer: oblivion

300

Convert from Binary to Decimal:

001101101111

Answer: 879

300

102 * 345  = ______ (mod 143)

Answer: 12

300

Find a linear combination such that

1223x+5y = GCD(1223,5)

1223x+5y = 1

x=2

y=-489

400

Encrypt this message using affine key of (25,24):

Instructor Arlis

Answer: qlgfhewfkh yhnqg

400

Decrypt this message that used affine key of (25,13):

ywjujaufztv

Answer: pretentious

400

Convert from Decimal to Binary

11011

Answer: 10101100000011

400

12341*20890 = _____ (mod 26)

Answer: 22

400

Find a linear combination such that

836x+12y = GCD(836,12)

836x+12y = 4

x=-1

y=70

500

Encrypt this message using matrix key of 

(8, 57)

(1, 10)


ZUQYWYLBIOVV

Answer: checkerboard

500

Decrypt this message that used matrix key of 

(9, 13)

(1, 2)


XZBVLXPBWXYC

Answer: Red White Blue

500

Convert from Decimal to Binary

345978

1010100011101111010

500

256 = _____ (mod 192)

Answer: 145

500

Find a linear combination such that

9358x+843y = GCD(9358,843)

9358x+843y = 1

x=-119

y=1321