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Homework: Read 5 inputs from stdin and write 5 outputs to stdout.

Onsite test: Modify DES and read 2 inputs from stdin and write 2 outputs to stdout

Homework:

I. Use the template plaintext and key to encrypt the plaintext using AES in ECB mode with PKCS_PADDING, CBC mode with ONE_AND_ZEROS_PADDING, and CFB mode with feedback size = 2.

II. Use the template ciphertext to decrypt the ciphertext using AES in ECB mode with PKCS_PADDING. We have to find the key which is a 16-byte string between 0000000000000000 and 0000000000099999.

III. Do the same as I and II but with stdin plaintext in I and stdin ciphertext in II.

Onsite test: Decrypt the ciphertext using AES in CFB with feedback size = 2, 4, or 8 and key is of form Our key is: XXXX where XXXX is a 4 HEX digit string.

Homework: Do either encryption or decryption using RSA, where the input format is enc n e m for encryption and dec n d c for decryption.

Onsite test: Use RSA encryption as a binary keystream generator. The input format is L n e X₀. The output is a 32-bit binary string where each bit is generated by encrypting X₀ and X₀ is updated by RSA encryption.

Homework: Implement a blockchain. The initial block message is your student ID.