Security researchers urge tech companies to explain cryptographic choices

Open letter outlines 10 transparency principles for companies to regain user trust following surveillance revelations

Fourteen prominent security and cryptography experts have signed an open letter to technology companies urging them to take steps to regain users’ trust following reports over the past year that vendors collaborated with government agencies to undermine consumer security and facilitate mass surveillance.

The researchers pointed out as alarming allegations that RSA, the security division of EMC, made a $10 million (€7.3 million) deal with the NSA to keep a compromised crypto algorithm the default setting in its security product long after the algorithm’s faults were revealed. RSA has denied such a deal.

The open letter was signed by well-known computer scientists, cryptographers, developers and security researchers. Among them are Matthew Green, assistant research professor at Johns Hopkins University; Tanja Lange, professor at Eindhoven University of Technology; Bruce Schneier; Roger Dingledine and Nick Mathewson of the Tor Project; Brian Warner and Zooko Wilcox-O’Hearn of the Tahoe-LAFS Project; Christopher Soghoian, principal technologist at the American Civil Liberties Union and Brendan Eich, CTO of Mozilla Corporation.

 

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The letter was an initiative of the advocacy group Electronic Frontier Foundation and outlines 10 principles, both technical and legal, to which signatories believe technology companies should adhere.

The first principle has to with code integrity and has been expressed by security experts before. There’s no easy way to verify how an open cryptographic algorithm has been implemented in closed-source software, so the letter’s signatories urged companies to provide public access to source code whenever possible. If companies also distribute pre-compiled binary packages, they should adopt a reproducible build process so users can obtain the same binaries from the source code, the researchers said.

“Both open and closed source software should be distributed with verifiable signatures from a trusted party and a path for users to verify that their copy of the software is functionally identical to every other copy (a property known as ‘binary transparency’),” they said.

The second principle requires companies to be open about their cryptographic choices and to explain why certain algorithms and parameters were used in their software.

“Make best efforts to fix or discontinue the use of cryptographic libraries, algorithms, or primitives with known vulnerabilities and disclose to customers immediately when a vulnerability is discovered,” the researchers said.

Other principles outlined in the letter include:

  • protecting data in transit at all times with strong encryption to prevent upstream surveillance
  • discarding user data that’s no longer needed for business operations
  • keeping an open and productive dialogue with security and privacy researchers
  • providing a clear method for researchers to report vulnerabilities
  • promptly fixing reported vulnerabilities
  • regularly publishing “transparency reports” about government requests for user data
  • publicly opposing mass surveillance and efforts to backdoor or weaken security tools
  • fighting in courts attempts by governments or third-parties to compromise user security

This open letter follows another one sent by security and cryptography researchers to the US government in January, deploring the NSA’s surveillance activities. In that letter, researchers asked the US government to reject society-wide surveillance and attempts to subvert security systems and instead adopt state-of-the-art privacy-preserving technology.

 

Lucian Constantin, IDG News Service

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'string') { return '+1 000 000 0000'; // Default US placeholder } var mockPlaceholders = [ { countryCode: 'US', placeholder: '+1 000 000 0000', helpText: 'Include the US country code +1 before the phone number', }, { countryCode: 'GB', placeholder: '+44 0000 000000', helpText: 'Include the GB country code +44 before the phone number', }, { countryCode: 'CA', placeholder: '+1 000 000 0000', helpText: 'Include the CA country code +1 before the phone number', }, { countryCode: 'AU', placeholder: '+61 000 000 000', helpText: 'Include the AU country code +61 before the phone number', }, { countryCode: 'DE', placeholder: '+49 000 0000000', helpText: 'Fügen Sie vor der Telefonnummer die DE-Ländervorwahl +49 ein', }, { countryCode: 'FR', placeholder: '+33 0 00 00 00 00', helpText: 'Incluez le code pays FR +33 avant le numéro de téléphone', }, { countryCode: 'ES', placeholder: '+34 000 000 000', helpText: 'Incluya el código de país ES +34 antes del número de teléfono', }, { countryCode: 'NL', placeholder: '+31 0 00000000', helpText: 'Voeg de NL-landcode +31 toe vóór het telefoonnummer', }, { countryCode: 'BE', placeholder: '+32 000 00 00 00', helpText: 'Incluez le code pays BE +32 avant le numéro de téléphone', }, { countryCode: 'CH', placeholder: '+41 00 000 00 00', helpText: 'Fügen Sie vor der Telefonnummer die CH-Ländervorwahl +41 ein', }, { countryCode: 'AT', placeholder: '+43 000 000 0000', helpText: 'Fügen Sie vor der Telefonnummer die AT-Ländervorwahl +43 ein', }, { countryCode: 'IE', placeholder: '+353 00 000 0000', helpText: 'Include the IE country code +353 before the phone number', }, { countryCode: 'IT', placeholder: '+39 000 000 0000', helpText: 'Includere il prefisso internazionale IT +39 prima del numero di telefono', }, { countryCode: 'NO', placeholder: '+47 000 00 000', helpText: 'Inkluder NO landskode +47 før telefonnummeret', }, { countryCode: 'SE', placeholder: '+46 00 000 00 00', helpText: 'Inkludera SE landskod +46 före telefonnumret', }, { countryCode: 'DK', placeholder: '+45 00 00 00 00', helpText: 'Inkluder DK landekode +45 før telefonnummeret', }, { countryCode: 'FI', placeholder: '+358 00 000 0000', helpText: 'Sisällytä FI-maakoodi +358 ennen puhelinnumeroa', }, { countryCode: 'EE', placeholder: '+372 0000 0000', helpText: 'Lisage EE riigikood +372 telefoninumbri ette', }, { countryCode: 'PL', placeholder: '+48 000 000 000', helpText: 'Podaj numer kierunkowy PL +48 przed numerem telefonu', }, { countryCode: 'SK', placeholder: '+421 000 000 000', helpText: 'Pred telefónne číslo uveďte kód krajiny SK +421', }, { countryCode: 'LV', placeholder: '+371 0000 0000', helpText: 'Iekļaujiet LV valsts kodu +371 pirms tālruņa numura', }, { countryCode: 'LT', placeholder: '+370 0000 0000', helpText: 'Įtraukite LT šalies kodą +370 prieš telefono numerį', }, { countryCode: 'GR', placeholder: '+30 000 000 0000', helpText: 'Συμπεριλάβετε τον κωδικό χώρας GR +30 πριν από τον αριθμό τηλεφώνου', }, { countryCode: 'PT', placeholder: '+351 000 000 000', helpText: 'Inclua o código de país PT +351 antes do número de telefone', }, { countryCode: 'HR', placeholder: '+385 00 000 0000', helpText: 'Uključite HR pozivni broj države +385 prije telefonskog broja', }, { countryCode: 'SI', placeholder: '+386 00 000 000', helpText: 'Vključite SI kodo države +386 pred telefonsko številko', }, { countryCode: 'IS', placeholder: '+354 000 0000', helpText: 'Láttu IS landsnúmer +354 fylgja á undan símanúmerinu', }, { countryCode: 'LU', placeholder: '+352 000 000 000', helpText: 'Incluez le code pays LU +352 avant le numéro de téléphone', }, { countryCode: 'MC', placeholder: '+377 00 00 00 00', helpText: 'Incluez le code pays MC +377 avant le numéro de téléphone', }, { countryCode: 'AD', placeholder: '+376 000 000', helpText: 'Incloeu el codi de país AD +376 abans del número de telèfon', }, { countryCode: 'JE', placeholder: '+44 0000 000000', helpText: 'Include the JE country code +44 before the phone number', }, { countryCode: 'IM', placeholder: '+44 0000 000000', helpText: 'Include the IM country code +44 before the phone number', }, { countryCode: 'GG', placeholder: '+44 0000 000000', helpText: 'Include the GG country code +44 before the phone number', }, { countryCode: 'AL', placeholder: '+355 00 000 0000', helpText: 'Përfshini kodin e vendit AL +355 para numrit të telefonit', }, { countryCode: 'SM', placeholder: '+378 0000 000000', helpText: 'Includere il prefisso internazionale SM +378 prima del numero di telefono', }, { countryCode: 'FO', placeholder: '+298 000000', helpText: 'Inkluder FO landekode +298 før telefonnummeret', }, { countryCode: 'MT', placeholder: '+356 0000 0000', helpText: 'Include the MT country code +356 before the phone number', }, { countryCode: 'LI', placeholder: '+423 000 0000', helpText: 'Fügen Sie vor der Telefonnummer die LI-Ländervorwahl +423 ein', }, { countryCode: 'GI', placeholder: '+350 000 00000', helpText: 'Include the GI country code +350 before the phone number', }, { countryCode: 'MD', placeholder: '+373 00 000 000', helpText: 'Includeți codul de țară MD +373 înaintea numărului de telefon', }, { countryCode: 'HU', placeholder: '+36 00 000 0000', helpText: 'A telefonszám előtt adja meg a HU országkódot +36', }, { countryCode: 'NZ', placeholder: '+64 00 000 0000', helpText: 'Include the NZ country code +64 before the phone number', }, { countryCode: 'ME', placeholder: '+382 00 000 000', helpText: 'Uključite ME pozivni broj države +382 prije telefonskog broja', }, ]; const selectedPlaceholder = mockPlaceholders.find(function(item) { return item && item.countryCode === countryCode; }); return selectedPlaceholder ? selectedPlaceholder.placeholder : mockPlaceholders[0].placeholder; } function updatePlaceholder(countryCode, fieldName) { if (!countryCode || !fieldName) { return; } const phoneInput = document.querySelector('#mce-' + fieldName); if (!phoneInput) { return; } const placeholder = getDefaultPlaceholder(countryCode); if (placeholder) { phoneInput.placeholder = placeholder; } } function updateCountryCodeInstruction(countryCode, fieldName) { updatePlaceholder(countryCode, fieldName); } function getDefaultHelpText(countryCode) { var mockPlaceholders = [ { countryCode: 'US', placeholder: '+1 000 000 0000', helpText: 'Include the US country code +1 before the phone number', }, { countryCode: 'GB', placeholder: '+44 0000 000000', helpText: 'Include the GB country code +44 before the phone number', }, { countryCode: 'CA', placeholder: '+1 000 000 0000', helpText: 'Include the CA country code +1 before the phone number', }, { countryCode: 'AU', placeholder: '+61 000 000 000', helpText: 'Include the AU country code +61 before the phone number', }, { countryCode: 'DE', placeholder: '+49 000 0000000', helpText: 'Fügen Sie vor der Telefonnummer die DE-Ländervorwahl +49 ein', }, { countryCode: 'FR', placeholder: '+33 0 00 00 00 00', helpText: 'Incluez le code pays FR +33 avant le numéro de téléphone', }, { countryCode: 'ES', placeholder: '+34 000 000 000', helpText: 'Incluya el código de país ES +34 antes del número de teléfono', }, { countryCode: 'NL', placeholder: '+31 0 00000000', helpText: 'Voeg de NL-landcode +31 toe vóór het telefoonnummer', }, { countryCode: 'BE', placeholder: '+32 000 00 00 00', helpText: 'Incluez le code pays BE +32 avant le numéro de téléphone', }, { countryCode: 'CH', placeholder: '+41 00 000 00 00', helpText: 'Fügen Sie vor der Telefonnummer die CH-Ländervorwahl +41 ein', }, { countryCode: 'AT', placeholder: '+43 000 000 0000', helpText: 'Fügen Sie vor der Telefonnummer die AT-Ländervorwahl +43 ein', }, { countryCode: 'IE', placeholder: '+353 00 000 0000', helpText: 'Include the IE country code +353 before the phone number', }, { countryCode: 'IT', placeholder: '+39 000 000 0000', helpText: 'Includere il prefisso internazionale IT +39 prima del numero di telefono', }, { countryCode: 'NO', placeholder: '+47 000 00 000', helpText: 'Inkluder NO landskode +47 før telefonnummeret', }, { countryCode: 'SE', placeholder: '+46 00 000 00 00', helpText: 'Inkludera SE landskod +46 före telefonnumret', }, { countryCode: 'DK', placeholder: '+45 00 00 00 00', helpText: 'Inkluder DK landekode +45 før telefonnummeret', }, { countryCode: 'FI', placeholder: '+358 00 000 0000', helpText: 'Sisällytä FI-maakoodi +358 ennen puhelinnumeroa', }, { countryCode: 'EE', placeholder: '+372 0000 0000', helpText: 'Lisage EE riigikood +372 telefoninumbri ette', }, { countryCode: 'PL', placeholder: '+48 000 000 000', helpText: 'Podaj numer kierunkowy PL +48 przed numerem telefonu', }, { countryCode: 'SK', placeholder: '+421 000 000 000', helpText: 'Pred telefónne číslo uveďte kód krajiny SK +421', }, { countryCode: 'LV', placeholder: '+371 0000 0000', helpText: 'Iekļaujiet LV valsts kodu +371 pirms tālruņa numura', }, { countryCode: 'LT', placeholder: '+370 0000 0000', helpText: 'Įtraukite LT šalies kodą +370 prieš telefono numerį', }, { countryCode: 'GR', placeholder: '+30 000 000 0000', helpText: 'Συμπεριλάβετε τον κωδικό χώρας GR +30 πριν από τον αριθμό τηλεφώνου', }, { countryCode: 'PT', placeholder: '+351 000 000 000', helpText: 'Inclua o código de país PT +351 antes do número de telefone', }, { countryCode: 'HR', placeholder: '+385 00 000 0000', helpText: 'Uključite HR pozivni broj države +385 prije telefonskog broja', }, { countryCode: 'SI', placeholder: '+386 00 000 000', helpText: 'Vključite SI kodo države +386 pred telefonsko številko', }, { countryCode: 'IS', placeholder: '+354 000 0000', helpText: 'Láttu IS landsnúmer +354 fylgja á undan símanúmerinu', }, { countryCode: 'LU', placeholder: '+352 000 000 000', helpText: 'Incluez le code pays LU +352 avant le numéro de téléphone', }, { countryCode: 'MC', placeholder: '+377 00 00 00 00', helpText: 'Incluez le code pays MC +377 avant le numéro de téléphone', }, { countryCode: 'AD', placeholder: '+376 000 000', helpText: 'Incloeu el codi de país AD +376 abans del número de telèfon', }, { countryCode: 'JE', placeholder: '+44 0000 000000', helpText: 'Include the JE country code +44 before the phone number', }, { countryCode: 'IM', placeholder: '+44 0000 000000', helpText: 'Include the IM country code +44 before the phone number', }, { countryCode: 'GG', placeholder: '+44 0000 000000', helpText: 'Include the GG country code +44 before the phone number', }, { countryCode: 'AL', placeholder: '+355 00 000 0000', helpText: 'Përfshini kodin e vendit AL +355 para numrit të telefonit', }, { countryCode: 'SM', placeholder: '+378 0000 000000', helpText: 'Includere il prefisso internazionale SM +378 prima del numero di telefono', }, { countryCode: 'FO', placeholder: '+298 000000', helpText: 'Inkluder FO landekode +298 før telefonnummeret', }, { countryCode: 'MT', placeholder: '+356 0000 0000', helpText: 'Include the MT country code +356 before the phone number', }, { countryCode: 'LI', placeholder: '+423 000 0000', helpText: 'Fügen Sie vor der Telefonnummer die LI-Ländervorwahl +423 ein', }, { countryCode: 'GI', placeholder: '+350 000 00000', helpText: 'Include the GI country code +350 before the phone number', }, { countryCode: 'MD', placeholder: '+373 00 000 000', helpText: 'Includeți codul de țară MD +373 înaintea numărului de telefon', }, { countryCode: 'HU', placeholder: '+36 00 000 0000', helpText: 'A telefonszám előtt adja meg a HU országkódot +36', }, { countryCode: 'NZ', placeholder: '+64 00 000 0000', helpText: 'Include the NZ country code +64 before the phone number', }, { countryCode: 'ME', placeholder: '+382 00 000 000', helpText: 'Uključite ME pozivni broj države +382 prije telefonskog broja', }, ]; if (!countryCode || typeof countryCode !== 'string') { return mockPlaceholders[0].helpText; } const selectedHelpText = mockPlaceholders.find(function(item) { return item && item.countryCode === countryCode; }); return selectedHelpText ? selectedHelpText.helpText : mockPlaceholders[0].helpText; } function setDefaultHelpText(countryCode) { const helpTextSpan = document.querySelector('#help-text'); if (!helpTextSpan) { return; } } function updateHelpTextCountryCode(countryCode, fieldName) { if (!countryCode || !fieldName) { return; } setDefaultHelpText(countryCode); } function initializeSmsPhoneDropdown(fieldName) { if (!fieldName || typeof fieldName !== 'string') { return; } const dropdown = document.querySelector('#country-select-' + fieldName); const displayFlag = document.querySelector('#flag-display-' + fieldName); if (!dropdown || !displayFlag) { return; } const smsPhoneData = window.MC?.smsPhoneData; if (smsPhoneData && smsPhoneData.programs && Array.isArray(smsPhoneData.programs)) { dropdown.innerHTML = generateDropdownOptions(smsPhoneData.programs); } const defaultProgram = getDefaultCountryProgram(smsPhoneData?.defaultCountryCode, smsPhoneData?.programs); if (defaultProgram && defaultProgram.countryCode) { dropdown.value = defaultProgram.countryCode; const flagSpan = displayFlag?.querySelector('#flag-emoji-' + fieldName); if 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: false; var shouldAppendCountryCode = smsNotRequiredRemoveCountryCodeEnabled ? isRequired : true; var phoneInput = document.querySelector('#mce-' + fieldName); if (phoneInput && defaultProgram.countryCallingCode && shouldAppendCountryCode) { phoneInput.value = defaultProgram.countryCallingCode; } displayFlag?.addEventListener('click', function(e) { dropdown.focus(); }); dropdown?.addEventListener('change', function() { const selectedCountry = this.value; if (!selectedCountry || typeof selectedCountry !== 'string') { return; } const flagSpan = displayFlag?.querySelector('#flag-emoji-' + fieldName); if (flagSpan) { flagSpan.textContent = getCountryUnicodeFlag(selectedCountry); flagSpan.setAttribute('aria-label', sanitizeHtml(selectedCountry) + ' flag'); } const selectedProgram = window.MC?.smsPhoneData?.programs.find(function(program) { return program && program.countryCode === selectedCountry; }); var smsNotRequiredRemoveCountryCodeEnabled = true; var smsField = Object.values({"EMAIL":{"name":"EMAIL","label":"Email Address","helper_text":"","type":"email","required":true,"audience_field_name":"Email Address","merge_id":0,"help_text_enabled":false,"enabled":true,"order":0,"field_type":"merge"},"FNAME":{"name":"FNAME","label":"First Name","helper_text":"","type":"text","required":false,"audience_field_name":"First Name","enabled":false,"order":null,"field_type":"merge","merge_id":1},"MMERGE2":{"name":"MMERGE2","label":"Second Name","helper_text":"","type":"text","required":false,"audience_field_name":"Second Name","enabled":false,"order":null,"field_type":"merge","merge_id":2},"MMERGE3":{"name":"MMERGE3","label":"Company Name","helper_text":"","type":"text","required":false,"audience_field_name":"Company Name","enabled":false,"order":null,"field_type":"merge","merge_id":3},"MMERGE4":{"name":"MMERGE4","label":"Job Title","helper_text":"","type":"text","required":false,"audience_field_name":"Job Title","enabled":false,"order":null,"field_type":"merge","merge_id":4},"SIGNUP":{"name":"SIGNUP","label":"Signup form location","helper_text":"","type":"text","required":false,"audience_field_name":"Signup form location","enabled":false,"order":null,"field_type":"merge","merge_id":5},"MMERGE6":{"name":"MMERGE6","label":"Image URL","helper_text":"","type":"imageurl","required":false,"audience_field_name":"Image URL","enabled":false,"order":null,"field_type":"merge","merge_id":6}}).find(function(f) { return f.name === fieldName && f.type === 'smsphone'; }); var isRequired = smsField ? smsField.required : false; var shouldAppendCountryCode = smsNotRequiredRemoveCountryCodeEnabled ? isRequired : true; var phoneInput = document.querySelector('#mce-' + fieldName); if (phoneInput && selectedProgram.countryCallingCode && shouldAppendCountryCode) { phoneInput.value = selectedProgram.countryCallingCode; } updateSmsLegalText(selectedCountry, fieldName); updatePlaceholder(selectedCountry, fieldName); updateCountryCodeInstruction(selectedCountry, fieldName); }); } document.addEventListener('DOMContentLoaded', function() { const smsPhoneFields = document.querySelectorAll('[id^="country-select-"]'); smsPhoneFields.forEach(function(dropdown) { const fieldName = dropdown?.id.replace('country-select-', ''); initializeSmsPhoneDropdown(fieldName); }); });

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