Simple encryption work -- 2

Status: Closed
Prize: €30
Entries Received: 1
Winner: haeckerzz

Winner

Contest Brief

I. Convert decimal to binary using 4 bits, Crypt in CBC mode and decrypt in CFB mode

Σ = {0, 1}, n = 4, K = S4, π = (13)(24) and I = 1100.

Example: (Screenshot_1)

Replace the 54391 with 46278

II. Shamir's Secret Sharing with parameters:

p = 11, k = 4 and n = 7

Detect the key K if the shares are:

c1 = (2,y1), c2 = (3,y2), c3 = (5,y3) and c4 = (7,y4)

where

y1 = 4, y2 = 6, y3 = 2, y4 = 7

Example: (Screenshot_2, Screenshot_3) replace 5439 with 4627

III. Convert decimal to binary with Feysel algorithm with following parameters:

m = 1011010011000110, 2n = 16, k = shift left (base premutation cypher shift left), r = 5 (iterations).

Verify the crypted text "C" with another applying of the algo where m = c.

Example: (Screenshot_4)
Replace: 54391 with 46278

IV. Create RSA cryptosystem with a public key based on two random three digit numbers (100,999) p and q and boolean cipher exponent e. Then crypt and decrypt the following number: 46278.

Example (Screenshot_5)
Replace: 54391 with 46278

Recommended Skills

Winner

Post a Contest Like This

Employer Feedback

“Great guy! Knows his math skills! Real professional!!!”

zoocommerce622, Bulgaria.

Top entries from this contest

haeckerzz India

0

Public Clarification Board

Contest Holder
- 4 years ago
The illustrations are for 1 number, you replace and calculate for the other number provided .
- 4 years ago
View 2 more messages
1. Contest Holder
  - 4 years ago
  Just the formulas and result. No coding. The same as on the screenshots but with the other data.
  - 4 years ago
2. haeckerzz
  - 4 years ago
  partial uploaded
  - 4 years ago
Kibalionist
- 4 years ago
That moment when you realize the task is so easy and so hard at the same time.
- 4 years ago
meherazhamid
- 4 years ago
I can't understand what to do!What thing do you need ?Can you please tell me??
- 4 years ago
harfarooqi
- 4 years ago
Or just illustration
- 4 years ago
harfarooqi
- 4 years ago
Do you need the code?
- 4 years ago
usmanahmed487
- 4 years ago
please share the screenshots you mentioned in the description.
- 4 years ago
1. Contest Holder
  - 4 years ago
  Thank you! It was a miss. Its updated already with the screenshots.
  - 4 years ago