Flag VP 301.1: Encrypt Text (2 pts)
Encrypt this text with a key of 7:The flag is the ciphertext, as a five-letter word.
HELLO
Flag VP 301.2: Decrypt Text Without the Key (5 pts)
Decrypt this ciphertext:The key is between 1 and 25.
VCVDVEKRIP
Flag VP 301.3: Decrypt Binary Data (10 pts)
Decrypt this ciphertext, which is in hex encoding.The key is between 1 and 255. The data was encrypted by adding the key to the bytes and wrapping around for totals larger than 255.
eb11060cdfc5eafdf9eaf3e9eae904e8e6eaf8e6f7
Flag VP 301.4: Decrypt Image (15 pts)
Download this file:https://samsclass.info/124/proj14/VP301-4Decrypt it as you did in the previous challenge.The key is between 0 and 255.
The decrypted file is a PNG image.
View the decrypted image to see the flag.
You will find it helpful to read this:
PNG (Portable Network Graphics) Specification
Flag VP 301.5: Vigenère Cipher (20 pts)
Download this file:VP301-5aThere are eight keys, used in sequence to encrypt each of the first eight bytes.The same eight keys are used for all the other eight-byte blocks.
Each key is between 0 and 255.
The decrypted file is a PNG image.
View the decrypted image to see the flag.