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[[wikipedia:Key length]]
 
  
* 2048 bits, default for [[RSA]] keys in [[OpenSSH 4.2]] (2005)
 
* 1024 bits
 
* 512 bits
 
* 256 bits: [[ed25519]]
 
  
== [[RSA]] ==
 
* [[macOS 10.15]] (2019) requires that [[TLS]] server certificates and issuing CAs using RSA keys must use [[key size]]s greater than or equal to 2048. <ref>https://support.apple.com/en-us/HT210176</ref>
 
  
== [[OpenSSH]] ==
 
 
[[OpenSSH 7.6]] (October 2017)
 
[[OpenSSH 7.6]] (October 2017)
 
* Refuse [[keys length]] <1024 bits in length and improve reporting for keys that do not meet this requirement.
 
* Refuse [[keys length]] <1024 bits in length and improve reporting for keys that do not meet this requirement.
  
[[OpenSSH 4.2]]: September 1, 2005 https://www.openssh.com/txt/release-4.2
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[[macOS 10.15]] requires that [[TLS]] server certificates and issuing CAs using RSA keys must use [[key size]]s greater than or equal to 2048. <ref>https://support.apple.com/en-us/HT210176</ref>
* Increase the default size of new [[RSA]]/[[DSA]] keys generated by <code>[[ssh-keygen]]</code> from 1024 to 2048 bits.
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* [[OpenSSH 4.2]]: September 1, 2005 https://www.openssh.com/txt/release-4.2
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** Increase the default size of new [[RSA]]/[[DSA]] keys generated by <code>[[ssh-keygen]]</code> from 1024 to 2048 bits.
  
 
== Related ==
 
== Related ==
* [[Openssh client]]: <code>[[Openssh client: Invalid key length|Invalid key lenght]]</code> connecting to a [[Cisco]] device
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* [[Openssh client: Invalid key length]] connecting to a [[Cisco]] device  
* [[RSA]], [[Ed25519]]
 
* <code>[[ssh-keygen]]</code>
 
  
 
== See also ==
 
== See also ==

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