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RSA encryption does not work for IKE authentication on routers, and the router displays the %CRYPTO-6-IKMP_CRYPT_FAILURE: IKE (connection id 4001) unable to encrypt (w/peers RSA public key) packet error message
This symptom occurs when authentication for the Internet Key Exchange (IKE) is configured as Rivest, Shamir, and Adelman (RSA) encryption (authentication rsa-encr).
What is RSA?
RSA can be defined as an Internet encryption and authentication system which uses an algorithm which was developed by Ron Rivest, Adi Shamir, and Leonard Adleman in 1977. It is the most commonly used encryption and authentication algorithm and is intigrated with the Web browsers from Microsoft and Netscape.