SMTP is close to being the perfect application protocol: it solves a - - PDF document

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Aug 07, 2023 36 likes •107 views

SLIDE 1

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✂ ☎ ✁ ✆ ✝✟✞✡✠☞☛✍✌✎✌✎✏✒✑ ✓✕✔✗✖✘✑✚✙✜✛✣✢✤✔✦✥✧✠✎★ ✩✘✪✬✫✭✪✯✮✬✰✲✱✳✱✵✴✯✶✸✷ ✮✹✪✺✫✭✷ ✰✯✶✦✰✼✻✾✽✦✿✲✪✬✫✒✰✯❀✭✶✼❁✬✫✭❂✲❃❅❄❇❆✺❈

By Jonas Birmé (birme@cs.umu.se)

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✂ ☎ ✁ ☎ ❉❋❊✵●✧❍❏■ ❑▼▲✲▲✼◆ ✷ ✻❖✪✺✫P✷ ✰✯✶✡◗✬✪✬❘✼❙✲❀❯❚✼❀✚✰✺✫✭✰✼✻✬✰✯◆ ❱✬❲ ❳✺❨❖❩✾❲ ❬✚❭ ❩✾❪❅❫✺❴❖❵❛❲ ❩❝❜✺❞✬❭ ❲ ❩✾❡▼❩✺❴❢❬❣❪ ❚✲❀❣✰✺✫✭✰✼✻✬✰✯◆ ❤ ✐✺❥❦❥✲❱✺❧♠✐✺♥❦❨♦❩✺❲ ❥♠❩❢♣❢❬✵❥✸❲ ❫✾❴❝❪rq ❩✾❲✲❱✬❲ ❳✹❬ ❳✬s✒❳✺t ✉ ✈❖✇②①④③✭⑤✹⑥②⑤✒⑦ ⑧❦⑨⑩❥✲❱✺❧❦⑧❦❭ ❡❶❨✬t ❩❷⑨❅❫✺❭ t❢❥♠❲ ❫✾❴❝❪rq ❩✾❲⑩❱✬❲ ❳❢❬ ❳✬s✒❳✺t ✉ ✈❖✇②①❇❸✒③✹⑥②⑦ ⑧✬⑧❦✐ ✉ ❹ ❺✭❻❝✇✚❼ ❽P❾ ❿✭➀ ➁ ➂②⑦ ➃✲➄✼⑧✼❧✼➅✚❴❢❬ ❩✾❲❣❴❖❩❖❬❣➆ ❪▼➃✲❭ ❲ ❩❖s♦❬ ❳✾❲ ♥➇⑧✹❩✺❲ ➈❦❭ s✒❩ ✉ ✈❖✇②①▼⑥②➉❢➊r➋✒➌✹⑥✚➉✒➊♦➍✭⑦ ➎⑩➏✲➏✼❚➐❑▼▲✲▲✼◆ ✷ ✻❖✪✺✫♦✷ ✰✯✶✡❚✲❀❣✰✺✫✭✰✼✻✬✰✯◆♠➑✼❀❣✪✲✱✵❙♠➒❷✰⑩❀r✮ ➓ ➔✼→P➣➐↔✹↕❝➙✬↕✾➛

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✂ ☎ ✁ ✄ ➜✎➝❏➞➠➟✎➡✳➡❶➢

“SMTP is close to being the perfect application protocol: it solves a large, important problem in a minimalist way.” On the Design of Application Protocols (RFC3117) by Marshall T.Rose

✂

✂ ☎ ✁ ✁ ➤➦➥✳➥✳➧✚➨ ➩❶❍✕➫➭➨ ❊➲➯☞➳❯❍✤■➸➵✡➺➦➻✦➺✺❊✕➫✲❊✳➩❯❊✧➧

✂

✂ ☎ ✁ ➼ ➤➦➥✳➥✳➧✚➨ ➩❷❍✕➫✯➨ ❊➲➯☞➳▼❍✕■➸➵✗➺➦➻✦➺✺❊➐➫✲❊✦➩❯❊➲➧ ❚♠✪✼❀❣✫✘✰✸➽④✪✳➾❅➚✸➪❢➶➘➹➷➴P➬✡➮④➱❇➱❇✃ ❐ ❒✼➮➭➪✹❐ ➹❇➾ ❄❇✽♠❙➸❮✎❙✼❰❅Ï✯✪✲◆ ◆ ✰♠➒Ð✴✸❤❖❙✯❀✚❤❶✫✚✰✧✰✲❰✬✫✒✪✸✷ ✶✦✿✼✰✲✻✬✴✯✱✵❙✼✶✺✫✭❤❛✰✲✶✳✿✲❙✼✱✵✪✯✶❦✿ ➃✼❳✬sP❞✬❡❯❩✬❴✹❬ ❪ Ñ✤❩✺Ò❯⑧✹❩✾❲ ➈❝❩✾❲ ❪ Ñ✤❩✺Ò❶Ó✺❲ ❳❢Ô❯❪r❩✾❲ ❪ Õ×ÖØÖ➦Ù

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✂ ☎ ✁ Ú Û✜➵✕➫❦ÜÝ❊➲➺✲Þ✍➤ß➥✧➥✦➧r➨ ➩❶❍➐➫✯➨ ❊✧➯✦à ➏✲◆ ❙✼✻❝✫✒❀✚✰✯✶✸✷ ✻➸á➇✪✲✷ ◆ ⑧❦⑨⑩❥✲❱ â➭❙✸✱➐✰✺✫✒❙✵❄⑩❙✲❀✒✱✵✷ ✶❦✪✲◆✹❑➷✻❝✻✬❙✼❤❖❤ ⑧✬⑧❦✐ ➑♠✷ ◆ ❙✵❄④❀②✪✯✶❦❤❖➽r❙✼❀ → ❥✲❱ ❮✎❙✯❰ ✐✺❥❦❥✲❱

SLIDE 2

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✂ ☎ ✁ ✆ ✝✟✞✡✠☞☛✟✌✎✍✏✞✒✑✓✞✒✔✖✕✘✗ ✙✛✚✢✜✘✣✤✣✘✥ ✦ ✧★✜★✩✪✦ ✫✬✚✟✥ ✜★✭✤✮✘✯✛✣✘✯ ✫✰✩✱✫✘✧✲✫✳✥✵✴✷✶✏✸✹✩✻✺✵✜✼✚✾✽✬✥ ✮❀✿ ❁❃❂ ❄❆❅✻❇ ❈✲❉ ❊★❈✲❋✹●✲❍✏❇ ❈■❉ ❏✾❑❆▲✲●✏❂ ▼✱❇ ❈★❉ ◆✰❖✎P■❈■❋✹◗★❂

✏❈✹P

◆✼❘✹▼❙◗✲❑❆❈❃▼✱❇ ❋✹❄✹▼✱❇

✏❈

❚★❂ ❇ ❯✹❄❃❋❱P

✂

✂ ☎ ✁ ❲ ❳✡✍❆❨✒✑❩✌❬✔❪❭ ❫ ✧✹✩❴✮✏✩✎❵❴✸✹✩❱✶✾❛✱❛✎✦ ✚✵❜ ❝✵●✏❈■❞ ▼❡❈✲❑❃❑★❍❢▼✱◗✲❑✻❑✏❈✹▼❙❇ ❂ ❑❣❅❤❑❃❖❬❖❱❄❃❉★❑❥✐✪❑■❦

✏❂

❑❣❖❴❑❆❈✲❍✏❇ ❈✲❉✖❇ ▼ ❧✾♠✬♥✘❚ ♦ ♣ q✎r✘s✪t ♣ r✪q✱✉ r✎✈ ✇ ✈❴s❴✉ ✇ q✱✈ ✇ q✱r❴①✰♦ ♣ q❬r✼② ③✲④✹⑤ ⑥✱⑦⑨⑧✤⑩ ✇ ♣ t ✇ t r❡❶❬❷⑨r✎✈ ✇ ❷✤✈❬r✪♦ ♣ ❸✘♣ ✉ r❴t ❹ ❷ ❺❱s✎①❻r✎❼ ✇ ❸✬⑩❬♦ r❡s❴❽■✈❴s❴✉ ⑤ ✈❬r✪♦ ♣ ❸❡♣ ✉ r✪t ❾ ❫ ✧✹✩❴✮✏✩✎❵❴✧★✫✘✶✰✚✾✩❱✦ ✚✵❜ ❧✾❇ ❿❬❑✻●■❦✰❍★❄✲▼ ❄❥❇ ❈✻◗✲❑★❄❃❍★❑★❂ ♥✰◗✲❑❢❖✲❇ ❿❴❑➀●■❦✤▼✱◗✲❑❥▲✲❄✲❋■➁❱❄❃❉★❑❥❅➀❘❃❖✎▼✳✐✲❑❥➁✪❈✲●■➂❤❈❥✐✲❑✹❦

❆❂

❑❣❖❴❑★❈✲❍✏❇ ❈■❉❥❇ ▼ ➃✏♥✾♥✘❚ ➄ ✫✼✚✘✚✵✮✤✧✪✩✪✦ ✫✬✚✏❵❱➅✤✥ ✜✏✸✪✩✪✦ ✚✵❜ ➆ ▲✲❑❆❈❥❈✲❑✹➂➇❋❬●✏❈★❈✲❑✲❋❱▼✱❇

✏❈❤❦
✏❂✏▼✱◗✲❑✻❍★❄✲▼

❄ ❁❬♥✘❚

✂

✂ ☎ ✁ ➈ ➉✷✔➋➊✻➌➋➍➇✌✱✔❪❭ ➎❻✫✼✯ ✮✢✧★✫✼✴✷✴➏✫✬✚✷✸❃✧★✺✤✮✘✴➏✮✤✸ ➐❆➑❃➑■➒ ❖✎▼ P✾➓ ❑ ➔ ♣ →✪♣ ✈❬r❬✈❀♣ q❙✉ s❀❺✎r ✇ ✈❬r✪t ✇ q✎✈❀➣❬s❬✈✎↔ ♠➙↕✱♠➛❊❣➜✱❏✤❁✪➝➋➞✹➟ ➑ ➞❬➠ ➡ q✬♣ ❸❡⑩❬♦ r✪❸✤r✪q✱✉ ✇ ✉ ♣ s✪q✬s❴❽✲✉ ❺✎r✬➢❬➤❬➤❬⑤ ❷ ✉ ↔❬♦ r❡✉ s❡r✪q✎➥⑨s❬✈❬r✳❺✎r ✇ ✈❴r❬t ✇ q✱✈❀➣❬s❬✈❴↔ ➦✪➧✪➧❃➨ ♣ ❷ ✇ t r✱✉ t ♣ r❙→ ✇ ♦❴❸✰r❴➥✱❺ ✇ q❬♣ ❷❴❸❻❽ s✪t★➩✵➫ ➩✤➭✎⑤ r❴q❱➥⑨s❴✈❬r❬✈✬s❱➣ ➯ r❴➥ ✉ ❷❬➲ ➳❴➵✹➸★➺ ➻❴➼✲➽ ➾❙➻✪➚✱➪❬➼✪➻✹➶ ➶ ➶ ➹✏❇ ❈✲❄❆❂ P❣➘❙❘★❈✲❑✏❈✲❋❴●★❍★❑❃❍❆➴

✂

✂ ☎ ✁ ➷

✝✟✞✟➬❪➌➮✍✾✕✼✌❬✔❪❭

➱✪✚✷✃✼➎✻❐❀❒✡✩✹✺✾✮✟✯✱✮✰✣✘✥ ✭✷✧★✫✤✽✤✮✒✦ ✸✡✦ ✽✤✮✼✚✾✩❴✦ ❛✎✦ ✮✤✽✟➅✏✭✡✩❬✺✘✯✱✮✾✮➮✚✰✶❡✴✷➅✾✮✼✯ ✸ ➞✪❖✎▼❴❮✢↕✱❈✲❍✏❇ ❋❬❄■▼ ❑✛➂✻◗✲❑✹▼✱◗✲❑✏❂✘❂ ❑★❰✏❘✲❑❃❖✎▼✘➂➙❄■❖➛❖✪❘✲❋✪❋❬❑■❖❬❖❬❦ ❘★➓✲●✏❂✏❦ ❄★❇ ➓ ❑❃❍ ➑ ❈✲❍✰❮★Ï✡◗★❇ ❋✹◗❥▲✲❄★❂ ▼✰●■❦✤▼✱◗✲❑❣❖✎P✲❖❬▼ ❑★❅➇❦ ❄❆❇ ➓ ❑★❍ Ð ❂ ❍✰❮✛↕ ❍★❑★❈✹▼✱❇ ❦ P➀▼❙◗✲❑✻❄❃❋❱▼✱❘✲❄★➓✲❑❆❂⑨❂

✏❂

Ñ➙✸✲✮✤✽Ò➅★✭✟✴➏✫✘✸✹✩❤✫✵❛✳✩❬✺✵✮✢✮✤✸✪✩❬✜✤➅✘✥ ✦ ✸❆✺✾✮✵✽➇✣✵✯✱✫✏✩❴✫✤✧❃✫✬✥ ✸

✂

✂ ☎ ✁ ➷ ➷ ÓÔ✗✳Õ✟✔❪➊✖Ö✢✍✏➌☞✔❥Õ ➱✪✚✵✽✤✮✘✣✤✮✤✚✵✽✘✮✰✚✾✩❤✮❆×✵✧✏✺✵✜✰✚✵❜✘✮✤✸❥✫✾Ø✤✮✼✯❡✩✪✺✾✮✢✸❃✜✘✴✡✮➋✧★✫✘✚✼✚✵✮✤✧✪✩✪✦ ✫✼✚ Ñ❀✸❃✮✤✽Ò➅★✭➋❛❙✮✵ÙÚ✜✼✣✘✣✤✥ ✦ ✧✲✜✏✩✪✦ ✫✼✚✵✸❣✩❴✫✤✽✘✜❆✭ ❒✰✦ ✣✾✮✘✥ ✦ ✚✵✦ ✚✾❜ ♠✛❘★➓ ▼✱❇ ▲★➓ ❑❥❂ ❑✲❰✏❘✲❑■❖❬▼⑨❖➛✐★❘✹▼✳▲★❂

❃❋✪❑❃❖❬❖❴❑★❍❣❖❴❑❆❂⑨❇

❄✏➓ ➓ P ❏✾❑❃❍✏❘✲❋❬❑❆❖➛❈✲❑■▼ ➂➙●✏❂ ➁➀➓ ❄✲▼ ❑★❈✲❋❱P ❒✵✮✤✯✱✸★✦ ✸❃✩✱✮✘✚✏✩➛✧★✫✘✚✼✚✵✮✾✧❃✩✪✦ ✫✼✚✵✸➏✦ ✚✢Û❀❐✘❐✛❒❃Ü✾Ý✰Þ Ý ➃✵♥✾♥✰❚✪ß✹➞❃à á❢❋❃➓

❆❖❴❑❆❂✏▼
✻❋✪●✏❈★❈✲❑❃❋❱▼❙❇
✏❈

➒ ✐★➓ ❄■❖✎▼❙❇ ❈✲❉

✂

✂ ☎ ✁ ➷ ☎ ÓÚ☛✖✕❡Ö➋✞✒✔✖✕✳✌ ➊➀❨➏✕✳✌ ➌➮✔ â➙✮✼✯❙✦ ❛❙✭➏✩✹✺✵✮✟✦ ✽✤✮✼✚✾✩✪✦ ✩✎✭✡✫✰❛❤✣✾✮✤✮✘✯⑨✸❻✫✼✚✡✩✹✺✵✮✡✧★✫✼✚✘✚✤✮✾✧❃✩❱✦ ✫✼✚ ✃✵✙➙✃✬ã❥ä❱✃✘✦ ✴➋✣✘✥ ✮✡✙➛✶✏✩❬✺✤✮✘✚★✩✪✦ ✧★✜✏✩❴✦ ✫✼✚✷✜✰✚✵✽✟✃✘✮✏✧✾✶✰✯✎✦ ✩✎✭✟ã■✜❆✭✵✮✼✯ å ❁✲❂ ❄❆❅❤❑✲➂➙●✏❂⑨➁✬❦

✏❂✵❄❆❘❃▼

◗✲❑✏❈✹▼✱❇ ❋✪❄✲▼✱❇ ❈✲❉❪▲✲❑✲❑❆❂ ❖ ✃✘✃✳ã❱Ü✹❐❀ã■✃☞ä❙❐➙✯❙✜✼✚✾✸❆✣✵✫✼✯ ✩➀ã★✜✏✭✵✮✼✯✳✃✘✮✏✧✾✶✼✯❙✦ ✩⑨✭✵å ◆✤❖✎P■❅✻❅➀❑✹▼❴❂ ❇ ❋❢➁❱❑✲P■❖ ➒❴æ ❋✪❑★❂ ▼✱❇ ❦✱❇ ❋❬❄■▼ ❑❃❖

SLIDE 3

✂

✂ ☎ ✁ ✆ ✄ ✝✟✞✡✠ ☛✌☞✎✍✑✏ ✒✡✓ ✔✖✕✗✔✗✘✚✙✛✙✢✜✤✣ ✓✦✥★✧✪✩✬✫✤✓ ✙✮✭✯✣ ✘✚✙✪✔✰✓ ✱✲✔✰✩✲✙✳✣ ✴✰✘✟✫✰✘✚✥✶✵✷✴✗✥★✣ ✸✹✣ ✱✲✫✖✙✪✣ ✴✰✘ ✺✼✻✾✽❀✿✹❁✼❂✚❃❀❄✗❄✬❅✡❆✬❇ ❈❊❉ ❋✹●✦❍✲■✑❏✖■▲❑✑▼❖◆ ❍P❑✖◗✬▼❊❘P❑✖■✲■P❍❙◆✲❚P❏✖◗

★❑✲■P❯❱❉

❲★◗ ❍❖❳✖❨P❍❖❋✹● ❍✲❯❩❍❖❋✳● ❑❙❬✲◆ ❉ ❋✳❘P❍❙❋❭❑✖■ ❍❙■P▼❖◗ ❪✾❚❊● ❍❖❯✎❚P❏✖◗

❴❫

✒✡✓ ✴✖✕✡✣ ✥✰✔✬❵❛✺✼✓❴✫✰✘✚❵✖✩❙✴✰✓✮✙❜✽✗✔✗✱✚❝✰✓❴✣ ✙✹✭✟✫✤✘✬✥❡❞★❢❭❣✐❤❛❥❖❦✪✔✚✱❖✙✑✽✬✔✗✱✚❝✰✓❴✣ ✙❴✭

✂

✂ ☎ ✁ ✆ ✁ ❧✐♠✌☞✯♥♣♦rq✦s✎t ✉✬✈✼✇②①✼③ ④✚①✼③ ⑤✼①✡①✼③⑦⑥✰⑧ ⑥ ⑨✾⑩✦❶✚❷✎❸ ❹✲❺ ❻✦❼ ❽❿❾ ❾ ➀ ➁✢➂ ➃✾➄ ➅❿❻✦❼ ➀ ➁❿➂ ➆❴➇P❽❖➁❿❼ ➀ ➁✢➂ ➈✬❹❙➉✳➊✤➋✬❸ ❹✲❺ ➌❊➍P➍❿➎ ❻❴❼ ➏P➄ ➐ ➃❖➀ ➁❿➅P➑ ➏ ➒✡➓✮➒→➔ ➣✗↔✬↕✾➊✤⑩ ➙❴❸ ❹✲❺ ➛❿➎ ➜✲➀ ➂✲➀ ❼ ➛❖➎ ➜P➀ ➂P➀ ❼ ➛❿➎ ➜✾➀ ➂✲➀ ❼ ➝✰➞❊➟❙❹✖➉✲➠✚⑩ ➊✰❹❖➟ ➡❿➀ ➡❊➐❖➄ ➀ ➁❊➀ ➁❊➂ ➁❊➇P➁❿➐ ➡❿➀ ➡✳➐❖➄ ➀ ➁❿➀ ➁✢➂✑➅❿➁❊➜➢➆✪➤❖❽❖➁❿➥✢➀ ➁❊➂ ➝→➦❙➙✪➠✲↔✗❹❖➙✪❸ ➉❿❶❙➙✪❸ ➊✰❹ ➧✳➨❙➧✾➩ ❽❊❻❴➐P➑ ➫✪➡✳➅❿❻❴❻ ❽❿❻✮➐❖➑ ➫❴➡❿➅❊❻❴❻ ➭✚⑩❴❸ ➯✚❶✚➉✢➟ ➧✳➨❙➧✾➩✮➫✦➲✚➩✹➧ ➁❊➇P➁❿➐ ➲❙➩✹➧

✂

✂ ☎ ✁ ✆ ➳ ✝✟✞✖➵➸♦✟s➸✞✾➺❭✠ s✷t ➻➽➼➾✔✗➚ ➚❙✥✗✔✗❵✲✣ ➪✰✘✬✔✗✥✯✩✰✓ ✴✗✙❴✴✡✱❖✴→➚✬✣ ❵ ➶✾▼✢❑❙◆ ❑✲❬✲◆ ❍ ➹❊❲ ❲✦❉ ▼❊❉ ❍❙■❖● ➶✚❉ ➘❩❚✲◆ ❍ ➹❊➴❊● ❍✖■❖❋❿❉ ❬✲◆ ❍ ➷✚❏❙❬✲❨❖❋✹●

✂

✂ ☎ ✁ ✆ ➬ ✝✟✞✖➵❱➺✡➵✷✍❩➵❡q t ➻❜✩✡✩✗➚ ✣ ✱P✫✖✙❿✣ ✴✰✘✯✻✲✫✲✭✗✔✡✓✑✒✗✓❴✴✖✙✪✴✗✱✲✴✰➚ ✒✡✓✮✴✖✙✪✴✗✱✲✴✰➚ ❵ ➮✖➱✚➱✡✃✖❐✬➮✖❪✚❚✳❍✖◗ ➱✬❍❊➴❊●✷➱✤◗ ❑❙■❖❋✹❲ ❍❙◗✡✃✲◗ ❏✾● ❏✲▼✢❏✖◆ ➶✚❒→➱✡✃✖❐✚➶✚❉ ➘❩❚✲◆ ❍❛❒❭❑✖❉ ◆❊➱✬◗ ❑❙■❖❋✹❲ ❍❙◗→✃✲◗ ❏❊● ❏✲▼✢❏✖◆ ➶✲➶✚➮ ❮✡❰✗➶✗❐✗Ï❴■❊● ❍❙◗✮■P❍P●✮Ð ❋❜❮✡❉ ◗ ❍P▼✳● ❏❙◗ ❪▲➶✾❍✖◗ Ñ✚❉ ▼✢❍ Ò→Ó✡Ó✗✒❱➻❜✩✡✩✗➚ ✣ ✱P✫✖✙✳✣ ✴✰✘✯✒✡✓✮✴✖✙✪✴✗✱✲✴✰➚✬❂✗✓✮✫✡✵✷✔✬➼❛✴→✓✹Ô

✂

✂ ☎ ✁ ✆ Õ Ö×➵Ø✞✰q ÙÚÖÛ✠ ÙrsÚÖÜs✯Ý Þ★✭✰✩✬✔✰✓ ✺✼✔✲ß✚✙✛✺✼✓❴✫✰✘❙❵P✸✹✔✤✓✑✒✬✓❴✴✖✙✪✴✗✱✲✴✰➚✖à❿Þ❭✺✰✺➢✒✬á ✺✼✓❴✫✰✘❙❵✾✸✦✔✤✓✑✜✚✭✡✩✚✔✰✓ ✙✢✔✚ß✖✙➢✥✡✴✗✱✚❝✤✵❱✔✰✘✚✙❴❵❖â➢✣ ✵✷✫✬➪✗✔✗❵❖â✑ã✮ã ã ✺✰➼➾✴✌✸❿➚ ✫✲✕✬✴❭✓ ❵❖â✛Þ★✺→✺➢✒✾ä✚å✤ã æ➸✫✗✘✬✥➽Þ★✺→✺✼✒❙ä✚å✬ã✦å✗ç ❏❙■✾❍✑▼❿❏✖■✲■P❍❖▼✪●✪❉ ❏✖■❩❚P❍❙◗✡❏✲❬✢è ❍❖▼✳● ❑❙◆ ◆P❏❙❬✢è ❍❖▼✳●✮❋✼❋P❘P❑✲◗ ❍❩●✦❘P❍▲❋✳❑❙➘➢❍❩▼❿❏✖■✲■P❍❖▼✳●✦❉ ❏✖■

✂

✂ ☎ ✁ ✆ é ê❀ë❡ëì✝îí❡s✎ï➽ð❱s✷t✛➺

SLIDE 4

✂

✂ ☎ ✁ ✆ ✝ ✞✠✟✡✟☞☛✍✌✡✎✑✏✠✒✓✎✕✔✗✖

% telnet www 80 Trying 130.239.40.20... Connected to gray.cs.umu.se. Escape character is '^]'. GET / HTTP/1.1 Host: www.cs.umu.se Connection: close

✘✚✙✜✛✣✢✤✙✦✥ ✧ ★✪✩ ✙✦✥ ✛✬✫✮✭ ✯✱✰

✂

✂ ☎ ✁ ☎

✞✲✟✳✟✴☛✍✌✳✎✑✔✶✵✓✷✳✸✓✔✹✎
✁

✂

✂ ☎ ✁ ☎✺✆ ✞✠✟✡✟☞☛✍✌✡✎✑✔✶✵✓✷✻✸✓✔✪✎

HTTP/1.1 200 OK Date: Wed, 26 Mar 2003 16:17:37 GMT Server: Apache/2.0.44 (Unix) Content-Location: index.html.en Accept-Ranges: bytes Connection: close Transfer-Encoding: chunked Content-Type: text/html; charset=ISO-8859-1 Content-Language: en <DATA>

✂

✂ ☎ ✁ ☎ ☎ ✼✾✽❀✿❂❁❄❃❆❅✡❇✳❈❉✟✴☛

✂

✂ ☎ ✁ ☎ ✄ ✼✾✽❀✿❂❁❊❃❋❅✡❇✳❈❉✟✴☛

✚❍

■❑❏✦▲ ▼❑❏❖◆✺P❘◗❊P❘❙✜P❚▲✜◗❊P✾▼✣❯❘❙✣❱✬❲❨❳✦❩❨▼✕▼❨■✕❲✦❍ ▲ ❬ ▼✦❭❪❙✬◆❄❍ ❫✦▼✣❴✳❍ ❳❛❵❝❜❡❞✲❢❘❣❖❢✚❤✕✐✮P❨◆❄❍ ❩❑❣✚❢✚❤❡❥ ❦ ❙✜❙✜P❨◆✺❴✚❍ ❳✦❩❧◗✮P✻❵✚P❘❭❋▼❝♠ ♥❖♦❋♣rq❋♣✣s t ♣❋✉✇✈❘①✬q✜q✤② ③ ✉④①❡✈❊③ ⑤✣⑥⑦② ①❡⑧❆♣✣s❖q✜s ⑤❡✈ ⑤✜✉④⑤✣② ⑨✤③ ⑩⑦q✜② ♣r①✜⑥❋❶✓q❷⑤❡❸❹♣✣s t❊❺✜② ❻ ❭❪▼❘❭✑❼r❽❋❼❿❾❧➀➁P❨◆➂❳✦P❚❳ ❦

❖❞➃❽✮❽✹❴❘❲✣◗✮❲
✁

✂

✂ ☎ ✁ ☎ ✁ ❇✳❈❉✟✴☛➄❇✾✎✕✔✪✔➅❁ ✷✳✸

% telnet mail.foo.se 25 Trying NNN.NNN.NNN.NNN... Connected to mail.foo.se. Escape character is '^]'. 220 mail.foo.se ESMTP Sendmail 8.12.3/8.12.3/Debian-5; Wed, 26 Mar 2003 19:21:53 +0100; (No UCE/UBE) logging access from: chomper.cs.umu.se(OK)- birme@chomper.cs.umu.se [130.239.40.37]

SLIDE 5

✂

✂ ☎ ✁ ☎ ✆ ✝✟✞✡✠☞☛✌✝✎✍✑✏✒✏✔✓ ✕✟✖

HELO AprilFool 250 mail.foo.se Hello birme@chomper.cs.umu.se [130.239.40.37], pleased to meet you MAIL from: ifoolu@whitehouse.gov 250 2.1.0 ifoolu@whitehouse.gov... Sender ok RCPT to: birme@jpl.se 250 2.1.5 birme@jpl.se... Recipient ok DATA 354 Enter mail, end with “.” on a line by itself From: <ifoolu@whitehouse.gov> To: birme@jpl.se

✂

✂ ☎ ✁ ☎ ✗ ✝✟✞✡✠☞☛✌✝✎✍✑✏✒✏✔✓ ✕✟✖

Subject: Hej hej This is a very nice message. /Me . 250 2.0.0 h2QILr8Q022855 Message accepted for delivery

✂

✂ ☎ ✁ ☎ ✘ ✙✎✚✜✛ ✓✣✢✥✤✧✦★✞✪✩✫☛✭✬✮☛✰✯✱☛✳✲ ✴✶✵✮✴✸✷ ✹✸✺✼✻✣✽ ✾✥✺❀✿❁✽ ✾✔❂✸❃✼❄✑❅❇❆❉❈❊❆ ❄✸❋ ✽ ✺●✾✼❍✸■●❏✥✺❉✾✭❑▼▲◆❄P❖❘◗❇■❉✾❀✾❊✺❙◗❚❍✣✽ ■❀✾ ▲P❯❀❱ ✺✥✺✮❏●❯✥❑❙❲❳✺❊❲✥❨✸✽ ✿❀✺❉✾✼❍✣✽ ✻✣✽ ◗❇❑✥❍❩✽ ■●✾❙❬❀❍❳❱ ❑❀✾❙❲❭✻ ✺●❱✶❑❉✾✥✿✰❪❀❏✥✿❀❑✥❍ ✺ ❫❇❴❛❵▼✴ ❂✸❃✼❄❁❜❊❝❀❞❀❝ ❂◆✺❉❡❘■✥❍ ✺❁❡✒❑❀✽ ❋❀❢✥■❊❣✼✺❙❲ ❤✐■❀❱ ✺✮◗❳■●❡✮❏❀❋ ✺✥❣❘❍✣❯✥❑❉✾✔❖❙❥✐❖❊❈

✂

✂ ☎ ✁ ☎ ❦ ✝❧✝✧♠ ♥P♦●♣◆qsr ♦tr✣♦✸✉✑✈●✇❳♦①✇✣♦sr②✉✳③ ④◆⑤s⑥ ♥P♦●♣◆qsr ♦✎⑦❚③ ⑥ ♦①✇②r✣⑤✸④✶⑧✥⑦❩♦sr ❵ ⑧❇⑨s✉❧✉✳♦❉✇❇r❳③ ♣✔♣●r⑩⑨s❶❊✇②✈ ❷ ④✸♣❀r⑩⑨P❶❀✇②⑧✔⑤s④◆❸❹♣❀✈s✉❧❶✶r✣♦✸⑧❙⑧✔❸✸⑤●✇❳⑤ ✴ q❉✇❚✇✣⑨✎q✸⑧❙♦✸⑧✔♥P♥❻❺

✂

✂ ☎ ✁ ☎ ❼ ✝❧✝✧♠❽✠❿❾ ✛ ✖✳✏✔➀✳✕✟❾❉➁➃➂ ✛✰➄ ✍❹❾ ❷ ④✶♣❉r⑩⑨P❶❀✇❳⑧❁⑤s④❉❸t♣❀✈P✉❧❶✸r✣♦✸⑧✥⑧✮✇❇➅◆♦❧❸P⑤❀✇②⑤ ➆ ⑧❙♦✸⑧✭➇✐➈ ✴ ❺❻✈P⑧✼✇②➉②➊✶⑤✸⑧✥♦✸❸❧⑤Pq●✇②➅✶♦s④❀✇❭③ ♣❀⑤●✇❳③ ✈s④✑⑤P④✸❸❹➋❀♦●⑨✎♦●➌◆♣●➅✶⑤s④◆➍P♦ ✴ q➎➊P⑥ ③ ♣✥➏❙❶sr❩③ ➐◆⑤●✇❳♦➑➋❊♦●⑨❧➒❳⑧❀③ ✉✎❶s⑥ ③ ⑦❚③ ♦✸❸❧♦●➌✶⑤➎✉✎❶s⑥ ♦✸➓

A B

➔ → ➣ ↔ ↕ ↔ ➙ ➛ ➜⑩➝ ➔ → ➞ ➟ ➝ ➛ ➜⑩➝ ➔ → ➞ ➟ ➝❭➠ ➡ ➢ ➤ ➡ ➥ ➦ ➧❳➨ ➛ ➜ ➝ ➔ → ➞ ➟ ➩ ➛ ➜⑩➝ ➔ → ➞ ➟ ➩✥➠ ➡ ➢ ➤ ➡ ➥ ➦✼➫❉➭✥➨ ➔ → ➞ ➧ ➯ ➲ ➳ ➲❇➦ ➡ ➥ ➵ ➸ ➺ ➳ ➦ ➻❭➼❳➽ ➳ ➾❭➚ ➸ ➪②➪❭➦ ➳ ➵ ➽ ➥❚➶ ➦ ➸ Do you trust this host blah blah blah

✂

✂ ☎ ✁ ✄

✝❧✝✧♠❽✩➘➹❁➁❻➴✳✍➑✖✑➁s✓

➷ ✛ ➁s✓ ✕✟✖ ❵ ⑧✥⑧◆q➎✉✑♦✸⑧✭✇✼➅◆⑤◆✇✭q➎④✶❸P♦✸r②⑥ ⑨➎③ ④✶➍✧⑥ ⑤●⑨◆♦sr➬➍Pq✸⑤✸r✣⑤s④❀✇❳♦✸♦✸⑧✔⑧❙♦✸♣❊qsr✣♦ ✇✼r ⑤s④✶⑧✥⑦❩♦Pr ➇✐➅sr❩♦●♦①✇✣⑨P❶◆♦✸⑧✸➮ ➱✸❲❳✺❀❱s❢✥❑❙❲❳✺❀✿❁❏❀❪❀❢❀❋ ✽ ◗❚✃②❏❀❱⑩✽ ❐❙❑✥❍ ✺❮❒❭✺✥❰▼◗❇❱ ❰◆❏✼❍ ■ ❖✥❑❙❲②❲❚ÏÐ■●❱ ✿ ▲➎❱ ❪❀❲❚❍ ✺✥✿❁❯✥■❉❲❚❍⑩❲❛Ñ❩✾✥■❁❑❀❪✼❍✣❯✥✺●✾✼❍ ✽ ◗②❑✼❍❳✽ ■●✾❙Ò

SLIDE 6

✂

✂ ☎ ✁ ✄✝✆ ✞✟✞✡✠☞☛✍✌✏✎✟✎✒✑✔✓✖✕✘✗ ✌✙✎ ✚✜✛✣✢ ✤✦✥ ✧★✢ ✩✫✪✭✬✯✮✱✰★✰✲✩✱✢ ✳✴✥ ✰✟✵★✰✶✩✫✪✷✵✱✰★✰✲✩✶✪✸✤✹✥ ✵✱✰ ✺✯✻✲✩✭✪✯✛✭✤✼✩✟✮✟✳✽✬✲✩✣✢ ✢✯✵✱✾✿✮❀✪✽✵✱❁✫❁✔✮✱✰✯❂

✂

✂ ☎ ✁ ✄ ☎ ❃❅❄ ✞ ❆ ✩✱✰✯✤❇✾✼✮★✢ ✥ ❈❉✩✲❂✟❂★✮✭✤✼✮✱❊✲✮✭✳❋✩✫●✒✥ ✤✸✬✫✮✶✢ ✢★✰✯✮✱❁✔✩✯✳★❍✘✰✲✵✭✤■✳✷✪✽✮✶✢ ✮✱❊★✢ ✩❑❏ ▲■✥ ✳✦✤✸✾✝✥ ❊✣✛✭✤✼✩✶❂✙✳✷✵✱✢ ✛✭✤✹✥ ✵✱✰❀●✒✥ ✤❇✬❀✤✦✬★✾▼✩✲✩❀✤▼◆✱✧✲✩✶✳❖✵✲P✿✳✷✩★✾ ◗✲✩✱✾✼✳✲❍ ❘❚❙✽❯✦❱❳❲❋❨✽❱✽❩❭❬❫❪❚❬✭❴ ❵✷❬❳❴ ❪ ❛✯❙❋❙❉❜✘❨❋❱❳❩■❬❝❪❚❬✭❴ ❵✸❬❳❴ ❪ ❞★❡✸❜✼❢❋❙✭❴▼❣ ❜ ❱✸❜✼❣ ❵❉❬❤❨❋❱❳❩■❬❫❪❚❬❳❴ ❵✸❬✭❴ ✐■✰✫✩✭✻✯✮✱❁✫✧✶✢ ✩✔●✒✬✶✩✶✾✼✩✟✪✽✢ ✥ ✩✱✰✽✤❋❥ P❦✵✶✵❑❥ ✰✣✛❧✢ ✵✶✵✱♠❳✛✱✧✯✳❤✤❇✬✲✩✫♥❋♦✔✵✭P ✳✽✥ ✳✽✪❋✮❑❥ ✬✲✵✱❁✔✩★❥ ❊✲✥ ✾❦❁✒✩❑❥ ✳✽✩

✂

✂ ☎ ✁ ✄ ✄ ❃♣❄ ✞rq■✌✟✌✏s❖t✈✉

✂

✂ ☎ ✁ ✄ ✁ ❃❅❄ ✞①✇✏✑❀✓✖✌✈②❳③✙④ ⑤✯✵★✛✱✾▼⑥✼✤❚✛✱✧✱✢ ✩⑦❍

(Name, Value, Type, TTL)

⑧✯⑨❉⑩❋❬✭❶✶❞❑❷✶❸✣❱❳❩❭❬❫❹❚❺❀❻✼❼✷❹ ❱✷❽✯❽❳❴ ❬✷❪✦❪

(home.birme.se, 213.238.230.10, A, $TTL)

⑧✯⑨❉⑩❋❬✭❶❑❸✶❾✶❷✲❿★❙❳❩■❱✽❣ ❨➀❹❚❺❧❿➁❸✶❾❫❪❦❬✭❴ ❵❋❬✽❴

(birme.se, ns1.birme.se, NS, $TTL)

⑧✯⑨❉⑩❋❬✭❶❑➂❑➃❑❷✲❿✲❙✭❩■❱❳❣ ❨❫❹✼❺✙➂⑦❱✽❣ ❲✷❪❦❬❳❴ ❵✸❬❳❴

(birme.se, mail.birme.se, MX, $TTL)

✂

✂ ☎ ✁ ✄ ➄ ➅➇➆✙➆✟➈ ✐➉✧✱✧✲✢ ✥ ✪✷✮✭✤✹✥ ✵✱✰✙➊❉✮❳◆✲✩✱✾✖♦✶✾✝✵✭✤❇✵✲✪✽✵✱✢ ♦★✾ ✵✭✤❇✵✲✪✽✵✱✢ ✳ ➋✲⑧✯⑧✣❼✭❷✶➋✭⑨❳⑩✦❬✭❴ ⑧❳❬❉➌✦❜❀⑧✣❴ ❱❳❨✷❪✼➍ ❬❳❴★❼✽❴ ❙❉❜ ❙✽❯❇❙✭❲ ❾✯➂✘⑧✣❼✭❷✯❾✯❣ ❩➀⑩✽❲ ❬❫➂⑦❱✭❣ ❲✸⑧✲❴ ❱❳❨✷❪✼➍ ❬❳❴➁❼✷❴ ❙❋❜ ❙✽❯❇❙✭❲ ❾✽❾✯➋ ❿✱❸✶❾✶❷✯❻❚❨✸❜ ❬❳❴▼❨❋❬✸❜✝➎ ❪✖❿★❣ ❴ ❬✷❯✹❜ ❙✽❴ ⑨➀❾❉❬✭❴ ❵❳❣ ❯❚❬ ➏➁✺✱✺✲♦✔✐➉✧★✧✶✢ ✥ ✪✷✮✭✤✹✥ ✵✱✰✙♦★✾ ✵✭✤❇✵✲✪✽✵✱✢✶⑤✶✾ ✮✱❁✔✩✲●❫✵❑✾✼♠

✂

✂ ☎ ✁ ✄ ➐ ➅➇➆✙➆✟➈ ⑤✯✵★✛✱✰✲❂✶✩✶❂✈❊✯◆✙✚✴❥❑➑➁✵✶✳❋✩❧➒✦➑⑦⑤ ❆✡➓★➔✲→✣➔✣➣ ⑧✣❢❋❬❫↔✶❲ ❙✷❯✷↕❇❪✖➙✸➌❋❜ ❬✽❨✷❪✦❣ ➛✽❲ ❬❫➙✸➌❉❯✸❢❉❱❳❨❋➜✽❬❤❼✽❴ ❙❉❜ ❙✽❯❇❙✭❲ ➝⑦➝⑦➝✖➞ ➛❋❬✽❬❳⑩❋❯❚❙✭❴ ❬ ➞ ❙✭❴ ➜ ⑤✶✾ ✮✱❁✔✩❳●✜✵✱✾❇♠ ➟❳❙✭❴ ❬ ❼✽❴ ❙❉➍✼❣ ❲ ❬❳❪ ❆ ✵✱❁✫❁✔✵✱✰✙✧✶✾✼✵✱✧✲✩✱✾ ✤✹✥ ✩✶✳❤➠★✾✼✵★✛✱✧✯✩✶❂✏✥ ✰✔✤✼✵✙✮❀✪✽✵★✾▼✩ ✺✯✻✭✤✼✩✱✰✲❂✶✩✲❂✙●❤✥ ✤❇✬✙✧★✾▼✵✲P❦✥ ✢ ✩✲✳

SLIDE 7

✂

✂ ☎ ✁ ✄ ✆ ✝✟✞✡✠☞☛✟✌☞✞✎✍✑✏ ✌✓✒ ✔✖✕✗✕✙✘ ✚✎✛✢✜✤✣✦✥ ✧✩★ ✪✢✫✭✬✭✮✰✯ ✱ ✮✳✲✳✴✶✵✷✱ ✯ ✸✗✹✙✯ ✺ ✹✻✱ ✼ ✽✭✺ ✾✿✧✩❀✻❁✷❂✿✥ ✧❃★ ❄✿❅ ❄❇❆❈✯ ✽❊❉❊✯ ❋ ❉❊●✗✼ ❍✿■✿❏✩❁❇✛ ❑▲✥ ✧✩★ ▼✳◆ ❖✭✱ ✲P✱ ✯ ◗❙❘✭❚✤✧✡❀✎❯✡✛ ❁✙✧✎❚ ✪✰✸✳✹✳✮✭✮❊✽❱✼ ❲ ◗✗❳✩❑❱❯❃■✿✧✎❑❱✥ ❀✶✜✩❑❱✥ ❁❙✧ ❨❊❩✎❨✭❬ ❭❃✛❊✥ ❪✤✜✤❀✻❚ ❨❊❩✎❨✭❬ ❋ ❫❴❬✢❨

✂

✂ ☎ ✁ ✄ ❵ ❛❝❜❞❜❡✝❣❢✐❤❦❥✟❧❞❧♠✌☞♥❦♦❈❧♣✏ ✍

C S

q r s t t ✉ ✈ ✇ <start number='1' serverName='stateserver.example.com'> <profile uri='http://iana.org/beep/transient/xmlrpc' /> </start> q r s t t ✉ ✈ ✇ <profile uri='http://iana.org/beep/transient/xmlrpc' /> q r s t t ✉ ✈ ① ② ③ ④❊⑤ ⑥ ⑦ q ⑧ ⑨ ⑩ ❶ ❷ ✈ ✉

✂

✂ ☎ ✁ ✄ ❸ ❛❝❜❞❜❡✝ ❥☞☛❡☛❡♥✰✏▲❹❺❥❻✍✑✏ ✠♣❧❼☛✟✞❃✠❦✍✿✠❡❹❺✠❽♥☞❾❿❛❝❜❞❜❞✝ ➀➂➁ ✠❽✞➄➃➅✠☞✞✿✌➆☛❞✞❃✠❦➇✷✏✳♥ ✌✓✒ ➀ ❥❞➈♠✍❙❤♠✠❽✞✙✏ ➉➊❥♠✍❙✏▲✠☞❧❼☛✦✠❽♥❊✏ ❹➋✏ ✌✓✒ ➀ ☛❡✞✡✠✓➌❡✏▲✒➍✏ ✠☞❧❞✏❊❧❦➎➏✞✙➈❡♥▲✌✓✒

✂

✂ ☎ ✁ ✁

❛❽✏✰➐❡♥❊✏✢✠❡➎❽✞❃❥☞☛❡❤✦➑

➒P➓❴➔✢→➊➣✑↔ ↕✶➙❊➛✷➜➞➝ ➟✶→✖➠❴→❱➔✳➡ ➢P➜➤➓✻➥✎➦✿➧✶➧❴➨ ➡ ➩✰➫✻➝ ➡ ➓P➜➯➭✻➲ ➓✻➝ ➓❴➩✰➓❴➨ ➔❱➳ ↕✿➒✩➵❱➸➯➺✎➻❴➻❊➼✭↕✤➽✤➓✻➾➤➚✻➪✶➪❃➻✻↔ ➶✡➨ ➓P➜✻→P➜➞➹✤↔ ↕✤➘P➡ ➾❴➡ ➜✶→P➜✑➹✡↔ ↕✩➴✻➫✶➫P➲ ➡ ➜✶→P➜➷➣✗↔ ↕✿➒✎➡ ➜❴➜✶→✑➹✤↔ ↕✤➬✰→P➟✳➝✢➡ ➜✶→P➜➮➴❃↔ ↕✶➙❱➴✭➴✩➱✃➭P➲ ➓✭➝ ➓✭➩✳➓❴➨ ➦✿➲ ➩✭➟❴➡ ➝ →✭➩✰➝✢❐✭➲ →P➳ ↕✩❒ ➜❱➝ →✻➲ ➜✶→✻➝ ❮✢❰❃➲ ➫✻➥ ➝ ↕✩➴P→P➧➞➚✭➪P➪✶➚❴↔ ➶✡➨ ➓P➜✻→P➜➞➹✤↔ ↕✤➘P➡ ➾❴➡ ➜✶→P➜✑➹✡↔ ↕✩➴✻➫✶➫P➲ ➡ ➜✶→P➜➷➣✗↔ ↕✿➒✎➡ ➜❴➜✶→✑➹✤↔ ↕✤➬✰→P➟✳➝✢➡ ➜✶→P➜➮➴❃↔ ↕✶➙❱➴✭➴✩➱➊➹✡➲ ➫❴➜✭➔✳➧✳➓P➲ ➝ ➬✰➫✻Ï✻→P➲✷➭✻➲ ➓✻➝ ➓✭➩✳➓❴➨ ➳ ↕✩❒ ➜✳➝ →✭➲ ➜✭→✻➝ ❮ ❰✤➲ ➫✻➥ ➝ ↕✩➴✶→❴➧➞➚✻➪✭➪✎➚P↔ ➶✡➨ ➓P➜✻→P➜➞➹✤↔ ↕✤➘P➡ ➾❴➡ ➜✶→P➜✑➹✡↔ ↕✩➴✻➫✶➫P➲ ➡ ➜✶→P➜➷➣✗↔ ↕✿➒✎➡ ➜❴➜✶→✑➹✤↔ ↕✤➬✰→P➟✳➝✢➡ ➜✶→P➜➮➴❃↔ ↕✶➙❱➴✭➴✩➱ ➦✿❐❱➝ ➟✭→P➜✭➝ ➡ ➩✳➫✻➝ ➡ ➓✩➜➤➭✭➲ ➓✻➝ ➓✭➩❊➓❴➨ ➳ ↕✩❒ ➜✻➝ →P➲ ➜✻→✻➝ ❮✢❰✡➲ ➫❱➥ ➝ ↕✩➴P→P➧➞➚✭➪P➪✶➚ ➶✡➨ ➓P➜✻→P➜➞➹✤↔ ↕✤➘P➡ ➾❴➡ ➜✶→P➜✑➹✡↔ ↕✩➴✻➫✶➫P➲ ➡ ➜✶→P➜➷➣✗↔ ↕✿➒✎➡ ➜❴➜✶→✑➹✤↔ ↕✤➬✰→P➟✳➝✢➡ ➜✶→P➜➮➴❃↔ ↕✶➙❱➴✭➴✩➱ ➸✩➓P➜❴➜✳→✭➩❱➝ ➡ ➓❴➜➊➭✭➲ ➓✻➝ ➓✭➩❊➓❴➨ ➳ ↕✩❒ ➜❱➝ →P➲ ➜✻→✻➝ ❮✢❰✡➲ ➫✻➥ ➝ ↕✩➴P→P➧➞➚✭➪P➪✶➚❴↔ ➘P❐P➲ ➓✭➔❊→➮Ð✳↔ ➵✶↔✶➫P➜✳➠➍➒P➓✭➔❊➔✖➘✎↔ Ñ❻↔✳➙❊➸✩➓PÒ➞➧✭❐✭➝ →P➲✿➽✤→✻➝ Ó❙➓P➲ Ô✳➡ ➜✶➢❃Õ✻➦➯➹❃➓P➧✭❮✰❰✎➓✻Ó✗➜➮➦✤➧P➧❴➲ ➓❴➫✳➩✻➟ ➵❱→✶➫✻➝ ❐✭➲ ➡ ➜✳➢➷➝ ➟✻→➤❒ ➜✻➝ →❴➲ ➜✳→✭➝ ➳ ↕❴➥ ➡ ➲ ➔▲➝✡→✶➠✎↔✻➦✤➠P➠❴➡ ➔✰➓❴➜✑Ñ➯→✭➔✳➨ →✭ÏP↕❃➚✻➪✭➪✤➻