Alas, even libraries have enemies. Governments and corporations have tried to rewrite history. Ideological zealots have tried to suppress research of which they disapprove.The LOCKSS polling and repair protocol was designed to make it as difficult as possible for even a powerful attacker to change content preserved in a decentralized LOCKSS network, by exploiting excess replication and the lack of a central locus of control.
Just like libraries, Web archives have enemies. Jack Cushman and Ilya Kreymer's (CK) talk at the 2017 Web Archiving Conference identified seven potential vulnerabilities of centralized Web archives that an attacker could exploit to change or destroy content in the archive, or mislead an eventual reader as to the archived content.
Now, Rewriting History: Changing the Archived Web from the Present by Ada Lerner et al (L) identifies four attacks that, without compromising the archive itself, caused browsers using the Internet Archive's Wayback Machine to view pages that look different to the originally archived content. It is important to observe that the title is misleading, and that these attacks are less serious than those that compromise the archive. Problems with replaying archived content are fixable, loss or damage to archived content is not fixable.
Below the fold I examine L's four attacks and relate them to CK's seven vulnerabilities.