attack

Click on the red underlined text to get to the source

... This informational document suggests techniques for producing random quantities that will be resistant to such attack. It recommends that future systems include hardware random number ...

... of the target systems. However, it may still fail against a high grade attack on small single user systems, especially if the adversary has ever been able to observe the generation process in the past. A hardware ...

... unlikely someone could actually try continuously for a year. In fact, even if log files are only checked monthly, 500,000 tries is more plausible before the attack is noticed and steps taken to change passwords and make it harder to try more passwords ...

... Meet in the Middle Attacks ...

... If chosen or known plain text and the resulting encrypted text are available, a "meet in the middle" attack is possible if the structure of the encryption algorithm allows it. (In a known plain text ...

... of the encryption algorithm allows it. (In a known plain text attack, the adversary knows all or part of the messages being encrypted, possibly some standard header ...

... header or trailer fields. In a chosen plain text attack, the adversary can force some chosen plain text to be encrypted, possibly by "leaking" an exciting text that ...

... An oversimplified explanation of the meet in the middle attack is as follows: the adversary can half-encrypt the known or chosen plain ...

... is found, the full key can be assembled from the halves and used to decrypt other parts of the message or other messages. At its best, this type of attack can halve the exponent of the work required by the adversary while adding a large but roughly constant factor of effort. To be assured of safety against this, a doubling of the ...

... The meet in the middle attack assumes that the cryptographic algorithm can be decomposed in this way but we can not rule that out without a deep knowledge of the algorithm ...

... algorithm is not subject to a meet in the middle attack, an attempt to produce a stronger algorithm by applying the basic algorithm ...

... algorithm would be subject to a meet in the middle attack. ...

... Enormous resources may be required to mount a meet in the middle attack but they are probably within the range of the national security services ...