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The PKZIP legacy encryption is a stream cipher with a 96-bit state.

From this answerthis answer about the possibility of brute forcing an encrypted archive

Baring hypothesis change or progress in some of the above, it is inconceivable that the original file data can be recovered from the archive using anything remotely comparable to the computing effort that a GPU cluster can make in its operational life: if we had a thousand units of some kind each weeding a hundred thousand keys per microsecond for a century, odds are one in a thousand that the right key would be found.

The answer also refers to several papers published about known plaintext attacks on this cipher. The problem here is that, because the files are compressed, there is little real known plaintext to use.

The PKZIP legacy encryption is a stream cipher with a 96-bit state.

From this answer about the possibility of brute forcing an encrypted archive

Baring hypothesis change or progress in some of the above, it is inconceivable that the original file data can be recovered from the archive using anything remotely comparable to the computing effort that a GPU cluster can make in its operational life: if we had a thousand units of some kind each weeding a hundred thousand keys per microsecond for a century, odds are one in a thousand that the right key would be found.

The answer also refers to several papers published about known plaintext attacks on this cipher. The problem here is that, because the files are compressed, there is little real known plaintext to use.

The PKZIP legacy encryption is a stream cipher with a 96-bit state.

From this answer about the possibility of brute forcing an encrypted archive

Baring hypothesis change or progress in some of the above, it is inconceivable that the original file data can be recovered from the archive using anything remotely comparable to the computing effort that a GPU cluster can make in its operational life: if we had a thousand units of some kind each weeding a hundred thousand keys per microsecond for a century, odds are one in a thousand that the right key would be found.

The answer also refers to several papers published about known plaintext attacks on this cipher. The problem here is that, because the files are compressed, there is little real known plaintext to use.

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user9070
user9070

The PKZIP legacy encryption is a stream cipher with a 96-bit state.

From this answer about the possibility of brute forcing an encrypted archive

Baring hypothesis change or progress in some of the above, it is inconceivable that the original file data can be recovered from the archive using anything remotely comparable to the computing effort that a GPU cluster can make in its operational life: if we had a thousand units of some kind each weeding a hundred thousand keys per microsecond for a century, odds are one in a thousand that the right key would be found.

The answer also refers to several papers published about known plaintext attacks on this cipher. The problem here is that, because the files are compressed, there is little real known plaintext to use.

The PKZIP legacy encryption is a stream cipher with a 96-bit state.

From this answer about the possibility of brute forcing an encrypted archive

it is inconceivable that the original file data can be recovered from the archive using anything remotely comparable to the computing effort that a GPU cluster can make in its operational life

The answer also refers to several papers published about known plaintext attacks on this cipher. The problem here is that, because the files are compressed, there is little real known plaintext to use.

The PKZIP legacy encryption is a stream cipher with a 96-bit state.

From this answer about the possibility of brute forcing an encrypted archive

Baring hypothesis change or progress in some of the above, it is inconceivable that the original file data can be recovered from the archive using anything remotely comparable to the computing effort that a GPU cluster can make in its operational life: if we had a thousand units of some kind each weeding a hundred thousand keys per microsecond for a century, odds are one in a thousand that the right key would be found.

The answer also refers to several papers published about known plaintext attacks on this cipher. The problem here is that, because the files are compressed, there is little real known plaintext to use.

Source Link
user9070
user9070

The PKZIP legacy encryption is a stream cipher with a 96-bit state.

From this answer about the possibility of brute forcing an encrypted archive

it is inconceivable that the original file data can be recovered from the archive using anything remotely comparable to the computing effort that a GPU cluster can make in its operational life

The answer also refers to several papers published about known plaintext attacks on this cipher. The problem here is that, because the files are compressed, there is little real known plaintext to use.