CCNA Security 640-554 Quick Reference by Anthony Sequeira

By Anthony Sequeira

With this record as your advisor, you are going to evaluate issues on enforcing Cisco IOS community safeguard. This fact-filled quickly Reference enables you to get all-important info at a look, aiding you to concentration your learn on parts of weak spot and to reinforce reminiscence retention of crucial examination innovations.

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A user wants to sign some data. The user uses a signature algorithm with a personal signature key; only the signer knows this signature key. STEP 2. Based on the input data and a signature key, the signature algorithm generates its output, called a digital signature. STEP 3. The sending device attaches the digital signature to the message and sends the message to the receiver. STEP 4. The receiving device verifies the signature with the verification key, which is usually public. STEP 5. The receiving device inputs the message, the digital signature, and the verification key into the verification algorithm, which checks the validity of the digital signature.

Configure the IP domain name of your network using the ip domain-name domain_name command in global configuration mode. STEP 2. If there are any existing key pairs, overwrite them using the command crypto key zeroize rsa. STEP 3. Generate keys to be used with SSH by generating RSA keys using the crypto key generate rsa generalkeys modulus modulus-size command in global configuration mode. STEP 4. Configure how long the router waits for the SSH client to respond using the ip ssh timeout seconds command in global configuration mode; this step is optional.

2012 Pearson Education, Inc. All rights reserved. This publication is protected by copyright. Please see page 89 for more details. [ 51 ] Chapter 4: Site-to-Site VPNs ■ A chosen-cipher-text attack: The attacker can choose different cipher texts to be decrypted and has access to the decrypted plain text. ■ Birthday attack: A form of brute-force attack against hash functions. ■ Meet-in-the-middle attack: The attacker knows a portion of the plain text and the corresponding cipher text. Following are features that good encryption algorithms provide: ■ Resist cryptographic attacks.

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