Published
Edited
Oct 22, 2019
decodeVigenere(hw_5_1, `WHY`);
decodeVigenere(hw_5_2, `KEYS`);
decodeVigenere(hw_5_1, testKey);
// HW-05 P1
{
let decoded = decodeVigenere(hw_5_1, testKey);
// decoded = hw_5_1;
return getIC(decoded) - 0.066;
return getProbDist(decoded);
let split = splitIntoBlocks(decoded, 3);
// split = split.map((block) => getIC(block));
split = split.map((block) => getProbDist(block));
return split;
}
testKey = decode([ 22, 7, 24 ]);
{
let key = '';
for (let i = 0; i < 26; i++) {
for (let j = 0; j < 26; j++) {
for (let k = 0; k < 26; k++) {
if (i*26*26+j*26+k == 1250) {key = decode([i,j,k])};
}
}
}
return key;
}
{
let cipher = hw_5_1;
let columns = splitIntoBlocks(cipher, 3);
// return columns;
columns = columns.map((block) => getFreqencies(block, false));
// return columns;
// From lecture 15 notes
let sums = [];
for (let d = 0; d < 26; d++) {
let p = columns[0];
let q = columns[1];
let sum = 0;
for (let i = 0; i < 26; i++) {
sum += p.get(decode([i])) * q.get(decode([i-d]));
}
sums.push(sum);
}
// return sums;
return sums.indexOf(Math.max(...sums));
}
decodeVigenere(hw_5_1,`WHY`);
getRepeats(hw_5_1);
friedmanBlockLength(hw_5_1);
encode("ALC%f-t");
decode( [17] )
decode([ encode('y')-encode('k') ])
encode('WHY')
getIC(hw_5_1);
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