passphrase for symmetric encryption // ?maximum length

[vedaal at hush.com]

truecrypt shows an advisory that the maximum length for a 
passphrase is 64 characters

was curious as to if there is a maximum in gnupg?

(have tried 65, and it worked fine,
tried the same passphrase with only the first 64 characters, and it 
did not work,
i.e. the longer passphrase isn't simply just truncated at 64)

is there a maximum beyond which gnupg will just 'refuse' the 
passphrase,
or is there an effective maximum, where longer passphrases make no 
difference?


tia,

vedaal



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