Viginear cypher is more sophisticated than the Caesar cypher. Since the key is several characters long and the length is unknown, the frequency analysis technique becomes more challenging.
This is the next generation. 128-bit blocks, 128,192, 256 keys. It takes too much time to brute force.
In this article, I’m dissecting a very well-known (and that’s why not advisable to be used) cryptographic algorithm which is better known for IT tribe as “ROT13”.
DES - Symmetric. Data Encryption Standard. NIST 1993. 56 bit key, 64-bit plaintext input (blocks). How secure?
One-time pad is like a Viginear cypher but with the key the length of the cypher text.