Classifier Instance:

Anchor text: symmetric algorithm
Target Entity: Symmetric\u002dkey_algorithm
Preceding Context: When the Data Encryption Standard cipher was released in 1977, a key length of 56 bits was thought to be sufficient. There was speculation at the time, however, that the NSA has deliberately reduced the key size from the original value of 112 bits (in IBM's Lucifer cipher) or 64 bits (in one of the versions of what was adopted as DES) so as to limit the strength of encryption available to non-US users. The NSA has major computing resources and a large budget; some thought that 56 bits was NSA-breakable in the late '70s. However, by the late 90s, it became clear that DES could be cracked in a few days' time-frame with custom-built hardware such as could be purchased by a large corporation. The book Cracking DES (O'Reilly and Associates) tells of the successful attempt to break 56-bit DES by a brute force attack mounted by a cyber civil rights group with limited resources; see EFF DES cracker. 56 bits is now considered insufficient length for
Succeeding Context: keys, and may have been for some time. More technically and financially capable organizations were surely able to do the same long before the effort described in the book. Distributed.net and its volunteers broke a 64-bit RC5 key in several years, using about seventy thousand (mostly home) computers.
Paragraph Title: Symmetric algorithm key lengths
Source Page: Key size

Ground Truth Types:

Predicted Types:

Type	Confidence	Decision
wordnet_artifact_100021939	-1.3372888086377888	0
wordnet_event_100029378	-1.508455779618842	0
wordnet_organization_108008335	-1.5465138877471027	0
wordnet_person_100007846	-2.3062223923629923	0
yagoGeoEntity	-2.0090445647809587	0