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diff --git a/readconf.c b/readconf.c
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--- a/readconf.c	(revision 8241b9c0529228b4b86d88b1a6076fb9f97e4a99)
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+++ b/readconf.c	(date 1703169891147)
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@@ -326,6 +326,7 @@
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 	{ "securitykeyprovider", oSecurityKeyProvider },
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 	{ "knownhostscommand", oKnownHostsCommand },
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 	{ "requiredrsasize", oRequiredRSASize },
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+	{ "rsaminsize", oRequiredRSASize }, /* alias */
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 	{ "enableescapecommandline", oEnableEscapeCommandline },
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 	{ "obscurekeystroketiming", oObscureKeystrokeTiming },
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 	{ "channeltimeout", oChannelTimeout },
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diff --git a/servconf.c b/servconf.c
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--- a/servconf.c	(revision 8241b9c0529228b4b86d88b1a6076fb9f97e4a99)
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+++ b/servconf.c	(date 1703169891148)
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@@ -691,6 +691,7 @@
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 	{ "casignaturealgorithms", sCASignatureAlgorithms, SSHCFG_ALL },
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 	{ "securitykeyprovider", sSecurityKeyProvider, SSHCFG_GLOBAL },
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 	{ "requiredrsasize", sRequiredRSASize, SSHCFG_ALL },
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+	{ "rsaminsize", sRequiredRSASize, SSHCFG_ALL }, /* alias */
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 	{ "channeltimeout", sChannelTimeout, SSHCFG_ALL },
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 	{ "unusedconnectiontimeout", sUnusedConnectionTimeout, SSHCFG_ALL },
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 	{ NULL, sBadOption, 0 }