Whether for breaking codes in WWII, keeping your credit card info safe, or just cracking codes for fun, cryptography is a confluence of computer science and math that encrypts our most important data.
A certain message is encoded with a 2 letter key. The encrypted message is
We also happen to know that the second character of the plain-text is "I". Break the cipher and find the answer.
The following message is encrypted(via the Vingenre cipher) with the key
Decipher the message to obtain the answer.
is encrypted with a key of unknown length. The resulting cipher text is
What is the length of the key?