Oct 05, 2007 ssh-keygen can generate both RSA and DSA keys. RSA keys have a minimum key length of 768 bits and the default length is 2048. RSA keys have a minimum key length of 768 bits and the default length is 2048. Jun 18, 2013 The case for using 4096 bits. If an attack is found that allows a 2048 bit key to be hacked in 100 hours, that does not imply that a 4096 bit key can be hacked in 200 hours. The hack that breaks a 2048 bit key in 100 hours may still need many years to crack a single 4096 bit key.

• How To Generate Rsa Key
• Ssh Generate Key 2048 Bits Rsa Download
• Ssh Generate Key 2048 Bits Rsa Code

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In SSH, on the client side, the choice between RSA and DSA does not matter much, because both offer similar security for the same key size (use 2048 bits and you will be happy). Historically, version 1 of the SSH protocol supported only RSA keys. Jan 09, 2018  Today, the RSA is the most widely used public-key algorithm for SSH key. But compared to Ed25519, it’s slower and even considered not safe if it’s generated with the key smaller than 2048-bit. Using 2048-bit DSA Keys With OpenSSH. Feb 17, 2014. There's a long running debate about which is better for SSH public key authentication, RSA or DSA keys. With 'better' in this context meaning 'harder to crack/spoof' the identity of the user. Jul 29, 2019  Learn how to set up a secure connection to a remote host by generating SSH Keys on Ubuntu 18.04. An SSH Key is a secure method of logging into your server! The ssh-keygen command creates a 2048-bit RSA key pair. For extra security, use RSA4096: ssh –keygen –t rsa.

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Many people are taking a fresh look at IT security strategies in the wake of the NSA revelations. One of the issues that comes up is the need for stronger encryption, using public key cryptography instead of just passwords. This is sometimes referred to as certificate authentication, but certificates are just one of many ways to use public key technology.

One of the core decisions in this field is the key size. Most people have heard that 1024 bit RSA keys have been cracked and are not used any more for web sites or PGP. The next most fashionable number after 1024 appears to be 2048, but a lot of people have also been skipping that and moving to 4096 bit keys. This has lead to some confusion as people try to make decisions about which smartcards to use or which type of CA certificate to use. The discussion here is exclusively about RSA key pairs, although the concepts are similar for other algorithms (although key lengths are not equivalent)

The case for using 2048 bits instead of 4096 bits

• Some hardware (many smart cards, some card readers, and some other devices such as Polycom phones) don't support anything bigger than 2048 bits.
• Uses less CPU than a longer key during encryption and authentication
• Using less CPU means using less battery drain (important for mobile devices)
• Uses less storage space: while not an issue on disk, this can be an issue in small devices like smart cards that measure their RAM in kilobytes rather than gigabytes

So in certain situations, there are some clear benefits of using 2048 bit keys and not just jumping on the 4096 bit key bandwagon

The case for using 4096 bits

• If an attack is found that allows a 2048 bit key to be hacked in 100 hours, that does not imply that a 4096 bit key can be hacked in 200 hours. The hack that breaks a 2048 bit key in 100 hours may still need many years to crack a single 4096 bit key. It is also worth noting that simply adding 1 bit (going from 1024 bits to 1025 bits) does not double the effort to crack the key, each extra bit adds some security but a little bit less than what was gained with the previous bit. There is a law of diminishing returns with RSA key length.
• Some types of key (e.g. an OpenPGP primary key which is signed by many other people) are desirable to keep for an extended period of time, perhaps 10 years or more. In this context, the hassle of replacing all those signatures may be quite high and it is more desirable to have a long-term future-proof key length.

The myth of certificate expiration

Many types of public key cryptography, such as X.509, offer an expiry feature. This is not just a scheme to force you to go back to the certificate authority and pay more money every 12 months. It provides a kind of weak safety net in the case where somebody is secretly using an unauthorised copy of the key or a certificate that the CA issued to an imposter.

However, the expiry doesn't eliminate future algorithmic compromises. If, in the future, an attacker succeeds in finding a shortcut to break 2048 bit keys, then they would presumably crack the root certificate as easily as they crack the server certificates and then, using their shiny new root key, they would be in a position to issue new server certificates with extended expiry dates.

Therefore, the expiry feature alone doesn't protect against abuse of the key in the distant future. It does provide some value though: forcing people to renew certificates periodically allows the industry to bring in new minimum key length standards from time to time.

In practical terms, content signed with a 2048 bit key today will not be valid indefinitely. Imagine in the year 2040 you want to try out a copy of some code you released with a digital signature in 2013. In 2040, that signature may not be trustworthy: most software in that era would probably see the key and tell you there is no way you can trust it. The NIST speculates that 2048 bit keys will be valid up to about the year 2030, so that implies that any code you sign with a 2048 bit key today will have to be re-signed with a longer key in the year 2029. You would do that re-signing in the 2048 bit twilight period while you still trust the old signature.

4096 in practice

One of the reasons I decided to write this blog is the fact that some organisations have made the 4096 bit keys very prominent (although nobody has made them mandatory as far as I am aware).

Debian's guide to key creation currently recommends 4096 bit keys (although it doesn't explicitly mandate their use)

Fedora's archive keys are all 4096 bit keys.

The CACert.org project has developed a 4096 bit root

These developments may leave people feeling a little bit naked if they have to use a shorter 2048 bit key for any of the reasons suggested above (e.g. for wider choice of smart cards and compatibility with readers). It has also resulted in some people spending time looking for 4096 bit smart cards and compatible readers when they may be better off just using 2048 bits and investing their time in other security improvements.

In fact, the 'risk' of using only 2048 rather than 4096 bits in the smartcard may well be far outweighed by the benefits of hardware security (especially if a < a href='https://www.opensc-project.org/opensc/wiki/PinpadReaders'>smartcard reader with pin-pad is used)

How To Generate Rsa Key

My own conclusion is that 2048 is not a dead duck and using this key length remains a valid decision and is very likely to remain so for the next 5 years at least. The US NIST makes a similar recommendation and suggests it will be safe until 2030, although it is the minimum key length they have recommended.

My feeling is that the Debian preference for 4096 bit PGP keys is not based solely on security, rather, it is also influenced by the fact that Debian is a project run by volunteers. Given this background, there is a perception that if everybody migrates from 1024 to 2048, then there would be another big migration effort to move all users from 2048 to 4096 and that those two migrations could be combined into a single effort going directly from 1024 to 4096, reducing the future workload of the volunteers who maintain the keyrings. This is a completely rational decision for administrative reasons, but it is not a decision that questions the security of using 2048 bit keys today. Therefore, people should not see Debian's preference to use 4096 bit keys as a hint that 2048 bit keys are fundamentally flawed.

Unlike the Debian keys (which are user keys), the CACert.org roots and Fedora archive signing keys are centrally managed keys with a long lifetime and none of the benefits of using 2048 bit keys is a compelling factor in those use cases.

Practical issues to consider when choosing key-length

Therefore, the choice of using 2048 or 4096 is not pre-determined, and it can be balanced with a range of other decisions:

• Key lifetime: is it a long life key, such as an X.509 root for an in-house CA or an OpenPGP primary key? Or is it just for a HTTPS web server or some other TLS server that can be replaced every two years?
• Is it for a dedicated application (e.g. a closed user group all using the same software supporting 4096 bit) or is it for a widespread user base where some users need to use 2048 bit due to old software/hardware?
• Is it necessary to use the key(s) in a wide variety of smartcard readers?
• Is it a mobile application (where battery must be conserved) or a server that is likely to experience heavy load?

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• October 2, 2015
• Posted by: Syed Shujaat
• Category: Cisco, Networking Solutions

Use this command to generate RSA key pairs for your Cisco device (such as a router). keys are generated in pairs–one public RSA key and one private RSA key.

If your router already has RSA keys when you issue this command, you will be warned and prompted to replace the existing keys with new keys.

NOTE: Before issuing this command, ensure that your router has a hostname and IP domain name configured (with the hostname and ipdomain-name commands).

You will be unable to complete the cryptokeygeneratersacommand without a hostname and IP domain name. (This situation is not true when you generate only a named key pair.)

Here are the steps to Enable SSH and Crypto Key setup : 2 config must requried for SSH

1 Setup Local VTY line User ID and password

router (Config) # Line VTY 0 15

router (Config-line)# login local

router (Config-line)# Exit

Ssh Generate Key 2048 Bits Rsa Download

!!! create local login ID/Pass

router (Config)# username [loginid] password [cisco]

router (Config)# username loginid1 password cisco1

2. router (Config)# ip domain-name example.com

router (Config)# crypto key generate rsa

how many bits in the modulus [512] :1024/best-key-generator-windows-7-ultimate.html.

router (Config)# ip ssh version2

Ssh Generate Key 2048 Bits Rsa Code

router (Config)# CTRL Z

This command is not saved in the router configuration; however, the RSA keys generated by this command are saved in the private configuration in NVRAM (which is never displayed to the user or backed up to another device) the next time the configuration is written to NVRAM.

Modulus Length

When you generate RSA keys, you will be prompted to enter a modulus length. The longer the modulus, the stronger the security. However, a longer modules take longer to generate (see the table below for sample times) and takes longer to use.

The size of Key Modulus range from 360 to 2048. Choosing modulus greater than 512 will take longer time.

Cisco IOS software does not support a modulus greater than 4096 bits. A length of less than 512 bits is normally not recommended. In certain situations, the shorter modulus may not function properly with IKE, so we recommend using a minimum modulus of 2048 bits.

Syntax Description : Optional Strings to embed with SSH Crypto key