Software update-"incorrect digital signature"

I've used software update many times. Today, when attemting to use software update I get the following error message:
"the digital signature for this package is incorrect. the package may have been tampered with or corrupted since being signed by apple"
how do I correct this situation so software update will work correctly?
thanks,
pete
Mac OS X (10.4.10)

Since we don't know where the O.P. is located or why the digital signature is incorrect, I suggest taking the added precaution of verifying the SHA-1 Digest for at least the first of the manually downloaded updates if that method of obtaining them is used.

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Thank you for replying to my post.
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I just got the C82 to print readably, but still
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It's not your machine. It's Epson.
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Dual
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Update 10.5.8 digital signature is incorrect,

Update for iMac OS X 10.5.8. Downloads, but wont install.
Error
The digital signature of this package is incorrect. The package may have been tampered with or corrupted since being signed by Apple.
Updates are for Java 1.0,Security update 1.0, iTunes 10.3.1
Whats the issue?
WTFudge?

I had forgotten about this. I got absolutely no help from Apple (electronically or at Apple bar) where I bought it. Its sits in the basement and the kids play on it. Unfortunately their iPods dont even work on it, as it wont update iTunes now. I replacedit with a custom built PC running Microsoft. Unfortunately it was a 1500.00 mistake that I won't make again.

I am getting error :digital signature for this package is incorrect--

I have completed a clean install and have installed OS 9.2 as well as OS 10.3
and OS 10.4.2 from install DVDs apparently successfully. Now when I attempt to install the software updates for my computer, I get error that the digital signature of this package is incorrect and may have been corrupted since signed by apple. I have previously had all software up to date using software update/s etc. So how do I fix this digital signature Problem??
Harold

Hi, Harold and baltwo —
(1) Harold, I agree with baltwo's advice to try using "stand-alone" downloads as a short-term "work-around." But I realize this may be unsatisfying — if the error becomes chronic.
(2) baltwo's advice to search Apple's KnowledgeBase is normally a very useful resource — but in this instance, only provides links to a few articles about the topic as it relates to OS 9, Mail.app, and OS X Server. If you'd like to read background info about the current usage of digital signatures, you'll find info that's a bit more relevant from:
• Help »» Mac Help »» "What is a digital identity" and "certificate"
• an ADC search (using, e.g., [ exact phrase: "digital signature" and all the words:
"OS X" ] as terms)
• a Google•Mac search.
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(3) I haven't noticed a cogent solution that spans these problems. But the troubleshooting process outlined in KnowledgeBase Articles 106695: Troubleshooting Automatic Software Update in Mac OS X and 106692: Troubleshooting installation and software updates may be helpful. As the latter suggests, you may want to try logging-in to a temporary "test" administrator account as a means to determine whether your account's keychain is implicated specifically. (...or another user-specific issue.)
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"The digital signature for this package is incorrect. The package may have been tampered with or corrupted since being signed by “Apple”."
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The mechanism of Software Update forms from the registration procedures upon entering license section and admin authentication received securely to install Mac OS X 10.4 or 10.4.x. Some identifiable information such as computer ID, the unique MAC address, a node information and the registered information are transmitted to an Apple server with the digital signature.
I believe this server differs from the dot mac server with the reception system that includes time zone. Presumably, grabbed your information from the dot mac for the registration results in a logic-assertion failure (perhaps unrecoverable) with the error message-- lost or corrupted the consistency of the client information as well as the packages stored in the directory. Software Update routines may no longer be able to handshake with the server. Because, Software Update server audits localizations used the license, validating some XML document, parsing a distribution script for each scheduled software to be updated.
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I cannot say for sure if the following troubleshooting can fix the problem. If you like, try removing the folder and files onto the desktop's temporary folders. Restart the computer to test the recurrence.
/Library/Caches/com.apple.SoftwareUpdate/
/Users/HOME/Library/Caches/com.apple.SoftwareUpdate/
/Users/HOME/Library/Preferences/ByHost/com.apple.SoftwareUpdate.xxxxxxxxxxxx.pl ist
/Library/Preferences/com.apple.SoftwareUpdate.plist
/Users/HOME/Library/Preferences/com.apple.SoftwareUpdate.plist
You may want to test if this BSD command works with Terminal.
softwareupdate -l
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softwareupdate --list
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Software update-"incorrect digital signature"

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