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Member 1st Jan, 1970 01:00
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flamingotx RE: 7-zip 9.x
Member 26th Nov, 2011 06:53
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Last edited on 26th Nov, 2011 06:53
I ran into files compressed in 7-zip format with .7z as the file extension. 7-zip is a freeware program that seems to handle a number of compression formats. It doesn't seem to be malware though I have only used it once. I was surprised that it was not already listed in the Secunia database.
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Maurice Joyce RE: 7-zip 9.x
Handling Contributor 26th Nov, 2011 08:41
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Last edited on 26th Nov, 2011 09:13
The stable version 9.20 of 7Zip is listed by Secunia in PSI as secure.

If U are using 9.21 BETA or any other BETA releases they may/will not be registered. Details here:


The download link the the stable version is here:


Microsoft Surface 4 Intel i7 64Bit
Windows 10 Pro version 1809 Build 17763.404
IE & Edge Only
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RE: 7-zip 9.x
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lohobernard RE: 7-zip 9.x
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Generally speaking most modern compression algorithms give roughly the same compression, and with regard to the number of cores that you can use at once, it is up to you to decide how many you want to use. However, 7-zip is free and open source. The 7z format supports encryption with the AES algorithm with a 256-bit key. The key is generated from a user-supplied passphrase using an algorithm based on the SHA-256 hash function. The SHA-256 is executed 218 (262144) times,[4] which causes a significant delay on slow PCs before compression or extraction starts. This technique is called key stretching and is used to make a brute-force search for the passphrase more difficult. Current GPU-based, and custom hardware attacks limit the effectiveness of this particular method of key stretching,[5] so it is still important to choose a strong password. The 7z format provides the option to encrypt the filenames of a 7z archive.

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