I don't think "symmetric cryptography" means what you think it means. Stream ciphers and OTPs are both symmetric. The "symmetric" part is the fact that the sa

I don't think "symmetric cryptography" means what you think it means. Stream ciphers and OTPs are both symmetric. The "symmetric" part is the fact that the same key is used for encryption and decryption, not that the plaintext and key are the same length.