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RC4
Efficient stream cypher with notable weaknesses (no nonce, key leakage, weak IVs).
Key component in WEP, WPA and in SSL.
Also known as ARCFOUR in non-RSA implementations (Alleged RC-4) since the RC-4 algorithm was never officially released
Notes:
Vernam ciphers are stream ciphers that XOR a keystream with the plaintext to generate ciphertext.