BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//archive.cryptologicfoundation.org//NONSGML kigkonsult.se iCalcrea
 tor 2.30.10//
CALSCALE:GREGORIAN
METHOD:PUBLISH
UID:fcb5da4e-573f-469b-9aeb-5a22bcd357d2
X-WR-CALDESC:19 October 1875: Charles Wheatstone\, inventor of the Playfair
  Cipher and the Wheatstone Cryptograph\, died. The Playfair Cipher is a ma
 nual symmetric encryption technique and was the first literal digraph subs
 titution cipher. The Wheatstone Cryptograph was a pre WW I-era cipher devi
 ce used extensively by the British during WW I. Learn more about it <a hre
 f='https://cryptologicfoundation.org/community/museum-support/acquisitions
 /acquisitionarchivessection/codeandcipher_items/wheatstone_cryptograph.htm
 l'>HERE</a>.
X-WR-RELCALID:50036abd86e96fe157a9e00b479f4014
X-WR-TIMEZONE:America/New_York
BEGIN:VTIMEZONE
TZID:America/New_York
BEGIN:STANDARD
TZNAME:EST
DTSTART:20261101T020000
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
RDATE:20271107T020000
RDATE:20281105T020000
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:EDT
DTSTART:20270314T020000
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
RDATE:20280312T020000
RDATE:20290311T020000
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
UID:f381ebbc-66ac-4b0f-a466-8525fa193761
DTSTAMP:20260425T104451Z
DESCRIPTION:19 October 1875: Charles Wheatstone\, inventor of the Playfair 
 Cipher and the Wheatstone Cryptograph\, died. The Playfair Cipher is a man
 ual symmetric encryption technique and was the first literal digraph subst
 itution cipher. The Wheatstone Cryptograph was a pre WW I-era cipher devic
 e used extensively by the British during WW I. Learn more about it <a href
 ='https://cryptologicfoundation.org/community/museum-support/acquisitions/
 acquisitionarchivessection/codeandcipher_items/wheatstone_cryptograph.html
 '>HERE</a>.
DTSTART;TZID=America/New_York:20271019T000000
DTEND;TZID=America/New_York:20271019T235900
LOCATION:
SUMMARY:1875: Charles Wheatstone Died.
END:VEVENT
END:VCALENDAR