Can a Cisco IOS Tunnel interface with IPSec interoperate with other devices?

Introduction Over the years, numerous cryptographic algorithms have been developed can a Cisco IOS Tunnel interface with IPSec interoperate with other devices? used in many different protocols and functions. Cryptography is by no means static.

Steady advances in computing and the science of cryptanalysis have made it necessary to adopt newer, stronger algorithms and larger key sizes. Older algorithms are supported in current products to ensure backward compatibility and interoperability. Recommendations for Cryptographic Algorithms The following table can help customers migrate from legacy ciphers to current or more secure ciphers. The table explains each cryptographic algorithm that is available, the operations that each algorithm supports, and whether an algorithm is Cisco’s best recommendation. The status labels are explained following the table.

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Avoid do not provide adequate security against modern threats and should not be used to protect sensitive information. It is recommended that these algorithms be replaced with stronger algorithms. Legacy: Legacy algorithms provide a marginal but acceptable security level. They should be used only when no better alternatives are available, such as when interoperating with legacy equipment.

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It is recommended that these legacy algorithms be phased out and replaced with stronger algorithms. NGE algorithms are expected to meet the security and scalability requirements of the next two decades. For more information, see Next Generation Encryption. It is an area of active research and growing interest. Cisco is committed to providing the best cryptographic standards to our customers.

NGE still includes the best standards that one can implement today to meet the security and scalability requirements for network security in the years to come or to interoperate with the cryptography that will be deployed in that time frame. The biggest threat to crypto nowadays is another high-impact implementation issue, not a QC. Short key lifetime: Use of a short key lifetime improves the security of legacy ciphers that are used on high-speed connections. In IPsec, a 24-hour lifetime is typical.

A 30-minute lifetime improves the security of legacy algorithms and is recommended. Introduction to Cryptography Cryptography can provide confidentiality, integrity, authentication, and nonrepudiation for communications in public networks, storage, and more. Some real-world applications include protocols and technologies such as VPN networks, HTTPS web transactions, and management through SSH. Over the years, some cryptographic algorithms have been deprecated, “broken,” attacked, or proven to be insecure. There have been research publications that compromise or affect the perceived security of almost all algorithms by using reduced step attacks or others such as known plaintext, bit flip, and more. Additionally, advances in computing reduce the cost of information processing and data storage to retain effective security.

Symmetric key algorithms: These algorithms share the same key for encryption and decryption. Public key algorithms: These algorithms use different, mathematically related keys for encryption and decryption. Elliptic curve algorithms: These algorithms function over points that belong to elliptic curves. Hash: These algorithms provide a constant-sized output for any input and their most important property is irreversibility. The following section presents the recommended algorithms and key sizes for each category.

This document presents algorithms that are considered secure at present, the status of algorithms that are no longer considered secure, the key sizes that provide adequate security levels, and next generation cryptographic algorithms. NGE Background Information NGE offers the best technologies for future-proof cryptography and it is setting the industry trend. These are the best standards that one can implement today to meet the security and scalability requirements for years to come and to interoperate with the cryptography that will be deployed in that time frame. The algorithms that comprise NGE are the result of more than 30 years of global advancement and evolution in cryptography. Each constituent component of NGE has its own history, depicting the diverse history of the NGE algorithms as well as their long-standing academic and community review.

For instance, AES was named by the U. AES was not created by NIST. The following sections discuss the NGE algorithms in more detail. Categories of Cryptographic Algorithms There are four groups of cryptographic algorithms. Symmetric key algorithms use the same key for encryption and decryption. This designation means that 3DES provides a marginal but acceptable security level, but its keys should be renewed relatively often. Because of its small key size, DES is no longer secure and should be avoided.

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AES with 128-bit keys provides adequate protection for sensitive information. AES with 256-bit keys is required to protect classified information of higher importance. Public key algorithms use different keys for encryption and decryption. These keys are usually called the private key, which is secret, and the public key, which is publicly available. The private and public keys are cryptographically related.

The private key cannot be derived from the public key. The private key can be used only by its owner and the public key can be used by third parties to perform operations with the key owner. There are subexponential attacks that can be used against these algorithms. To compensate, their key sizes must be substantially increased. In practice, this means that RSA and DH are becoming less efficient every year.

DH, DSA, and RSA can be used with a 3072-bit modulus to protect sensitive information. ECC operates on elliptic curves over finite fields. The main advantage of elliptic curves is their efficiency. They can offer the same level of security for modular arithmetic operations over much smaller prime fields. Thus, the relative performance of ECC algorithms is significantly better than traditional public key cryptography. ECDH is a method for key exchange and ECDSA is used for digital signatures.

ECDH and ECDSA using 256-bit prime modulus secure elliptic curves provide adequate protection for sensitive information. ECDH and ECDSA over 384-bit prime modulus secure elliptic curves are required to protect classified information of higher importance. Hash algorithms are also called digital fingerprinting algorithms. They are irreversible functions that provide a fixed-size hash based on various inputs. Irreversibility and collision resistance are necessary attributes for successful hash functions.

SHA-1 is a legacy algorithm and thus is adequately secure. SHA-256 provides adequate protection for sensitive information. On the other hand, SHA-384 is required to protect classified information of higher importance. HMAC is used for integrity verification. HMAC-MD5, which uses MD5 as its hash function, is a legacy algorithm. Note that MD5 as a hash function itself is not secure.

It provides adequate security today but its keys should be renewed relatively often. Alternatively, the NIST-recommended HMAC function is HMAC-SHA-1. Security Levels The following table shows the relative security level provided by the recommended and NGE algorithms. The security level is the relative strength of an algorithm. Cryptographic Algorithm Configuration Guidelines After the review of NGE algorithms and recommendations on choosing cryptographic algorithms, it is worthwhile to review specific guidelines for security technology configuration.

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The guidelines in this section are by no means all inclusive. Avoid IKE Groups 1, 2, and 5. Use IKE Group 15 or 16 and employ 3072-bit and 4096-bit DH, respectively. When possible, use IKE Group 19 or 20. They are the 256-bit and 384-bit ECDH groups, respectively. Caution: Administrators are advised to use caution regarding processing load when they choose IKE groups. Some platforms may not support Group 15 or 16 in hardware, and handling them in the CPU could add significant load to the processor in lower-end products or multiple simultaneous IKE negotiation scenarios.

For Cisco ASA 5500 Series models, administrators are strongly advised to enable hardware processing instead of software processing for large modulus operations, such as 3072-bit certificates. Initially enabling hardware processing by using the crypto engine large-mod-accel command, which was introduced in ASA version 8. Not all product versions support SHA-256 or IKE Group 14, 19, 20, or 24. Recent releases of Cisco IOS Software and some other product version releases have incorporated support for some of these features. Transport Layer Security and Cipher Suites Many products are managed through a web interface using HTTPS.

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TLS is the successor of SSL and provides encryption, authentication, and integrity for web communications. 2 is preferred over SSL 3. TLS is also used in various Cisco products to provide VPN services. Cipher suites are combinations of security algorithms that are used in TLS.

When configuring products that support TLS, administrators are advised to use secure algorithms in the cipher suites of the TLS negotiation when possible. Use 3072-bit certificates with cipher suites that include TLS_RSA_. Configure the negotiated TLS cipher suites to include AES-128 or AES-256 GCM as the encryption algorithms and SHA-256 or SHA-384 for the hashes. However, not all product versions support the preceding cipher suites. Appendix A: Minimum Cryptography Recommendations The following table lists recommended cryptographic algorithms that satisfy minimum security requirements for technology as of October 2015. This document is provided on an “as is” basis and does not imply any kind of guarantee or warranty, including the warranties of merchantability or fitness for a particular use.

Your use of the information on the document or materials linked from the document is at your own risk. Cisco reserves the right to change or update this document at any time. What group is responsible for creating MPLS standards? The IETF’s MPLS Working Group is charged with establishing core MPLS standards.

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L3 VPN services, and MPLS Traffic Engineering. MPLS standards not related to the areas of focus of the IETF. The MFA is the union of the MPLS Forum, Frame Relay Forum, and ATM Forum. What MPLS related mailing lists are there and what are they used for?

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This list is for discussion of MPLS standards development. Note that several of the other IETF working groups also host mailing lists for discussion of MPLS standards for specific applications. MPLS stands for “Multiprotocol Label Switching”. At each hop, the LSR strips off the existing label and applies a new label which tells the next hop how to forward the packet.

IP tunnels for network-based virtual private networks. In many ways, LSPs are no different than circuit-switched paths in ATM or Frame Relay networks, except that they are not dependent on a particular Layer 2 technology. An LSP can be established that crosses multiple Layer 2 transports such as ATM, Frame Relay or Ethernet. Thus, one of the true promises of MPLS is the ability to create end-to-end circuits, with specific performance characteristics, across any type of transport medium, eliminating the need for overlay networks or Layer 2 only control mechanisms. To truly understand “What is MPLS”, RFC 3031 – Multiprotocol Label Switching Architecture, is required reading. MPLS evolved from numerous prior technologies including Cisco’s “Tag Switching”, IBM’s “ARIS”, and Toshiba’s “Cell-Switched Router”.

The IETF’s MPLS Working Group was formed in 1997. The initial goal of label based switching was to bring the speed of Layer 2 switching to Layer 3. Label based switching methods allow routers to make forwarding decisions based on the contents of a simple label, rather than by performing a complex route lookup based on destination IP address. SDH is deployed at Layer 1, ATM is used at Layer 2 and IP is used at Layer 3. SDH and ATM control plane to Layer 3, thereby simplifying network management and network complexity.

What is the status of the MPLS standard? Most MPLS standards are currently in the “Internet Draft” phase, though several have now moved into the RFC-STD phase. See “MPLS Standards” for a complete listing of current ID’s and RFC’s. There’s no such thing as a single MPLS “standard”. Instead there a set of RFCs and IDs that together allow the building of an MPLS system. For example, a typical IP router spec.