Editing Quantum key distribution (section)

=== Security proofs ===
If Eve is assumed to have unlimited resources, for example both classical and quantum computing power, there are many more attacks possible. BB84 has been proven secure against any attacks allowed by quantum mechanics, both for sending information using an ideal photon source which only ever emits a single photon at a time,<ref>{{cite journal | last1=Shor | first1=Peter W. | last2=Preskill | first2=John | title=Simple Proof of Security of the BB84 Quantum Key Distribution Protocol | journal=Physical Review Letters | volume=85 | issue=2 | date=2000-07-10 | issn=0031-9007 | doi=10.1103/physrevlett.85.441 | pmid=10991303 | pages=441–444| url=https://authors.library.caltech.edu/2745/1/SHOprl00.pdf | bibcode=2000PhRvL..85..441S | arxiv=quant-ph/0003004 | s2cid=703220 }}</ref> and also using practical photon sources which sometimes emit multiphoton pulses.<ref name="GLLP">D. Gottesman, H.-K. Lo, N. L¨utkenhaus, and J. Preskill, Quant. Inf. Comp. 4, 325 (2004)</ref> These proofs are unconditionally secure in the sense that no conditions are imposed on the resources available to the eavesdropper; however, there are other conditions required:
# Eve cannot physically access Alice and Bob's encoding and decoding devices.
# The random number generators used by Alice and Bob must be trusted and truly random (for example a [[Hardware random number generator|Quantum random number generator]]).
# The classical communication channel must be authenticated using an unconditionally secure authentication scheme.
# The message must be encrypted using [[one-time pad]] like scheme