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| ssh 2018-04-10 | ssh 2023-06-05 (current) | ||
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| The %%SSH%% employs a public key cryptography that uses [[ssh_keys|two keys pairs, for host and user]]. | The %%SSH%% employs a public key cryptography that uses [[ssh_keys|two keys pairs, for host and user]]. | ||
| - | ==== ==== Level 3 Headline ==== | ||
| - | ==== | ||
| ===== [[authentication]] Authentication in SSH ===== | ===== [[authentication]] Authentication in SSH ===== | ||
| SSH servers offer the client a selection of authentication | SSH servers offer the client a selection of authentication | ||
| Line 16: | Line 14: | ||
| the option to choose which methods can be used. In WinSCP, you can configure this on //[[ui_login_authentication|SSH > Authentication page]]// of Advanced Site Settings dialog. | the option to choose which methods can be used. In WinSCP, you can configure this on //[[ui_login_authentication|SSH > Authentication page]]// of Advanced Site Settings dialog. | ||
| - | The actual order of authentication methods is as follows: [[ui_login_authentication#gssapi|GSSAPI]] (SSH-2 only), [[public key]] (using [[ui_p==== Level 3 Headline ==== | + | The actual order of authentication methods is as follows: [[ui_login_authentication#gssapi|GSSAPI]], [[public key]] (using [[ui_pageant|Pageant]]), public key (using [[ui_login_authentication|configured file]]), keyboard-interactive, password. |
| - | ageant|Pageant]]), public key (using [[ui_login_authentication|configured file]]), keyboard-interactive (%%SSH-2%% only), TIS or Cryptocard (SSH-1 only), password. | + | |
| ===== [[verifying_host_key]] Verifying the Host Key ===== | ===== [[verifying_host_key]] Verifying the Host Key ===== | ||
| - | To prevent [[wp>Man-in-the-middle_attack|man-in-the-middle attacks]], each SSH server has a unique identifying code, called a host key. These keys prevent a server from forging another server's key. If you connect to a server for the first time or if the server presets a different key then previously, WinSCP will prompt you to [[ssh_verifying_the_host_key|verify the key]]. | + | To prevent [[wp>Man-in-the-middle_attack|man-in-the-middle attacks]], each SSH server has a unique identifying code, called a host key. These keys prevent a server from forging another server's key. If you connect to a server for the first time or if the server presets a different key than previously, WinSCP will prompt you to [[ssh_verifying_the_host_key|verify the key]]. |
| ===== Encryption in SSH ===== | ===== Encryption in SSH ===== | ||
| SSH clients and servers can use a number of encryption methods. | SSH clients and servers can use a number of encryption methods. | ||
| - | Most widely used encryption methods in SSH-2 are AES and | + | Most widely used encryption methods in SSH are AES and |
| Blowfish. By default, %%AES%% is used if supported by the server. While %%AES%% is | Blowfish. By default, %%AES%% is used if supported by the server. While %%AES%% is | ||
| considered to be highly secure, %%AES%% encryption requires substantial processor overhead. Blowfish is also considered | considered to be highly secure, %%AES%% encryption requires substantial processor overhead. Blowfish is also considered | ||
| Line 36: | Line 33: | ||
| ===== SSH Protocols ===== | ===== SSH Protocols ===== | ||
| - | Two major versions of the SSH protocol exist, SSH-2 and SSH-1. Most %%SSH%% servers nowadays allow modern and secure %%SSH-2%% only. | + | Two major versions of the SSH protocol exist, SSH-2 and SSH-1. Most %%SSH%% servers nowadays allow modern and secure %%SSH-2%% only, which is also WinSCP's default. |
| - | + | ||
| - | WinSCP's default setting is to use %%SSH-2%%. If you need to use deprecated and insecure %%SSH-1%% at all, you can configure this in [[ui_login_ssh|SSH preferences]]. | + | |
| ===== [[compression]] Compression ===== | ===== [[compression]] Compression ===== | ||
| Line 49: | Line 44: | ||
| attacks more difficult and by providing less data for | attacks more difficult and by providing less data for | ||
| cryptanalysis. | cryptanalysis. | ||
| + | |||
| + | ===== Supported Algorithms ===== | ||
| + | |||
| + | See list of [[ssh_algorithms|supported SSH algorithms]]. | ||