The PKZIP CRC algorithm was designed only as a means for checksum verification
to detect dropped or damaged bits in a compressed file. The PKZIP compressed
ZIP file format has evolved to include support for strong encryption algorithms
(3des, aes) using public/private key pairs following either the X.509 or
OpenPGP key formats.
From: openpgp [mailto:openpgp-bounces(_at_)ietf(_dot_)org] On Behalf Of Ryan
Carboni
Sent: Friday, April 03, 2015 2:35 AM
To: openpgp(_at_)ietf(_dot_)org
Subject: [openpgp] Is 64-bit blocks really insecure?
Given that the PKZIP cipher is a CRC stream cipher that requires 13 known
bytes... but factoring in the deflate algorithm, this increases to gigabytes of
data.
This security of PKZIP was the reason why compression was included in PGP.
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