# Problems

1 – 22 of 22
 Problem Title Likes Solvers Difficulty

#### Problem 55070. Caesar Cipher Shift

Created by: Yuang

0

11

#### Problem 54835. Caesar Cipher

Created by: Yuang

1

10

#### Problem 1150. Polybius Square

Created by: Mehmet OZC

3

39

#### Problem 1151. Decrypt Polybius

Created by: Mehmet OZC

1

33

#### Problem 751. Implement simple rotation cypher

Created by: Doug Hull

12

1029

#### Problem 45282. Cryptography with A Square Matrix : Decoding

Created by: Mehmet OZC

2

9

#### Problem 45211. AES SubBytes() Transformation

Created by: David Hill

0

5

#### Problem 1953. Simple Caesar Cypher - shift encrypt a message given an index number

Created by: Tyler

6

72

#### Problem 45279. Cryptography with A Square Matrix : Encoding

Created by: Mehmet OZC

2

9

#### Problem 44351. Code breaker, Part I: Operation Phoenix

Created by: David Verrelli

1

33

#### Problem 44356. Code breaker, Part II: Operation Orthos

Created by: David Verrelli

1

21

#### Problem 78. Implement a ROT13 cipher

Created by: Cody Team

9

1229

#### Problem 44959. RSA encryption using public key

Created by: David Hill

1

6

#### Problem 44961. RSA decryption

Created by: David Hill

2

6

#### Problem 44963. Mask Generation Function (MGF1) for PKCS #1 Standard utilizing Optimal Asymmetric Encryption Padding for RSA Cryptography

Created by: David Hill

1

3

#### Problem 44956. Determine RSA keys (public and private) given two prime number character strings (p and q)

Created by: David Hill

3

13

#### Problem 44383. Code breaker, Part III: Operation Xiangliu

Created by: David Verrelli

2

10

#### Problem 44924. Create State Array for initiating SHA-3-224 Hash

Created by: David Hill

0

2

#### Problem 44964. Optimal Asymmetric Encryption Padding of message for RSA Cryptography

Created by: David Hill

1

3

#### Problem 44965. Optimal Asymmetric Encryption Padding decoding of message for RSA Cryptography

Created by: David Hill

1

3

#### Problem 45212. AES MixColumns() Transformation

Created by: David Hill

0

2

#### Problem 45213. AES-256 KeyExpansion()

Created by: David Hill

0

2

1 – 22 of 22