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Second preimage

Definition(s):

  A message Ms’, that is different from a given message Ms , such that its message digest is the same as the known message digest of Ms.
Source(s):
NIST SP 800-106

  A message X’, that is different from a given message X , such that its message digest is the same as the known message digest of X.
Source(s):
NIST SP 800-107 Rev. 1